How to Fill Out Ohio Form IT-2023 (w/Examples) + FAQs

Ohio Form IT-2023, the Income Allocation and Apportionment Nonresident Credit and Part-Year Resident Credit form, is the worksheet that nonresidents and part-year residents of Ohio attach to their Ohio IT 1040 to calculate the credit that prevents Ohio from taxing income earned outside the state. The Ohio Department of Taxation requires the form whenever you mark “nonresident” or “part-year resident” on the IT 1040 and claim the credit on the Ohio Schedule of Credits.

The stakes are real. The Ohio Department of Taxation processes more than 5.8 million individual income tax returns each year, and IT-2023 is one of the most-adjusted attachments because filers misallocate wages, business income, and rental income between Ohio and non-Ohio columns. A single misplaced figure can shift thousands of dollars of credit and trigger a Notice of Assessment months later.

Here is what this guide covers:

📝 What IT-2023 actually does and who must file it under Ohio Revised Code 5747.05(A)
📂 Every document, K-1, W-2, and federal schedule you need before opening the form
🧮 A line-by-line walkthrough of Part A (allocation), Part B (apportionment), and the credit calculation
👥 Three filled-out examples — a part-year mover, a nonresident K-1 partner, and a reciprocal-state remote worker
🚫 The 10 most common mistakes that trigger Ohio Department of Taxation adjustment letters

What Form IT-2023 Is and Who Must File It

Ohio Form IT-2023 is the official Income Allocation and Apportionment Nonresident Credit and Part-Year Resident Credit worksheet. The form splits your federal adjusted gross income into two columns: income that belongs to Ohio and income that belongs to other states. The split feeds into the nonresident/part-year resident credit on line 36 of the Ohio Schedule of Credits, which reduces your Ohio tax to the share of income actually sourced to Ohio.

The legal foundation comes from Ohio Revised Code 5747.05(A), which grants the credit, and from ORC 5747.20 through 5747.231, which set the allocation and apportionment rules. The plain-English meaning is simple: Ohio only wants tax on the slice of your income that has an Ohio connection, and IT-2023 is how you prove the slice. If you skip the form, the Department denies the credit, and you pay Ohio tax on 100% of your federal AGI, which is almost always the wrong number.

You must file IT-2023 if any of the following are true for the 2025 tax year (the version filed in 2026, revision date printed on the form’s lower-left footer):

You were a nonresident of Ohio for the entire year and earned Ohio-source income (wages from an Ohio employer, rental income from Ohio property, K-1 income from an Ohio pass-through entity, or gambling winnings from an Ohio casino).
You were a part-year resident who moved into or out of Ohio during 2025.
You are claiming the nonresident credit on the Schedule of Credits and the credit is greater than zero.
You have business income that must be apportioned using Ohio’s three-factor formula (property, payroll, sales).

You may use the alternative Form IT NRC instead of IT-2023 if your only Ohio income is wages, interest, dividends, or rents — but most filers with K-1 or business income must use IT-2023. The federal anchor matters too: your starting point is line 11 of federal Form 1040, so a federal error rolls into the Ohio return.

Before You Start: Documents and Information You Need

Open a folder before you open the form. IT-2023 pulls numbers from at least four other documents, and missing one of them is the fastest way to file an inaccurate return that the Department of Taxation will adjust. Gathering everything first also lets you finish the form in one sitting, which reduces transcription errors between drafts.

Use this pre-filing checklist. Every item matters, and skipping one usually means you guess a number that the Department later corrects upward.

Federal Form 1040 for 2025 — IT-2023 starts with federal AGI from line 11, so the federal return must be final, not a draft, or your Ohio numbers will not match the IRS file the Department cross-checks.
All W-2 forms showing Box 15 (state) and Box 17 (state income tax) — wages with “OH” in Box 15 are Ohio-source, and wages with another state code are not, so a missing W-2 leads to a misallocated wage line.
All 1099 forms (1099-NEC, 1099-MISC, 1099-INT, 1099-DIV, 1099-R, 1099-G) — each 1099 needs a sourcing decision, and 1099-R retirement income for a nonresident is generally not Ohio-source under ORC 5747.20.
All Schedule K-1 forms from partnerships, S corporations, or trusts — Ohio K-1s carry an apportionment percentage you copy directly into IT-2023, and a missing K-1 zeroes out income that should be taxed.
Federal Schedules C, D, E, and F — these feed business income, capital gains, rental income, and farm income into the allocation columns, and the totals must match line by line.
Closing statements for any property bought or sold in Ohio — capital gain on Ohio real property is always Ohio-source, even for a nonresident, under ORC 5747.20(B)(2).
A move-date record if you are a part-year resident — utility shut-off dates, lease start dates, or driver’s license issue dates establish the day Ohio residency began or ended.
Prior-year IT-2023 if you filed one — apportionment factors often repeat, and a prior return is the fastest sanity check on this year’s numbers.
Property, payroll, and sales records for any business you own — the three-factor apportionment ratio in Part B requires Ohio and everywhere figures for each factor.

You will also need your Social Security number, your spouse’s SSN if filing jointly, and your Ohio residency dates. The Department’s OH|TAX eServices portal requires a verified account, so set that up at least 48 hours before the filing deadline because identity verification can take a full business day.

Where to Get the Form and How to Access It

The official 2025 Form IT-2023 is hosted on the Ohio Department of Taxation’s forms page. Download the PDF directly rather than using a third-party copy, because tax-prep blogs sometimes host outdated revisions and the line numbers shift between years. The revision date appears on the bottom-left of page 1, and you should confirm it reads a 2025 revision before you start filling.

You can also pick up a paper copy at any Ohio Department of Taxation walk-in center, at most public libraries during tax season, or by calling the Department’s forms request line at 1-800-282-1782. The mailed copy arrives in 7 to 10 business days, which is too slow if you are filing close to the April 15 deadline.

For e-filers, IT-2023 is built into every major tax software package — TurboTax, H&R Block, TaxAct, FreeTaxUSA, and Drake all generate it automatically when you mark a nonresident or part-year resident return. The software-generated version is identical to the PDF, but you should still review the printed copy before submission because software occasionally misclassifies K-1 income as Ohio-source when it is not.

The free state option is Ohio I-File through OH|TAX eServices, which is the Department’s own portal. I-File is free for all Ohio filers regardless of income, walks you through IT-2023 line by line, and electronically attaches the form to your IT 1040 automatically. It does not, however, prepare the federal return, so you must complete federal Form 1040 first.

Step-by-Step: How to Fill Out Ohio Form IT-2023 Line by Line

The form has two parts on two pages. Part A is the income allocation grid where you split each type of income into Ohio and non-Ohio columns. Part B is the business income apportionment ratio for filers who own a business or have an interest in a pass-through entity. Numbered fields below match the line numbers printed on the 2025 revision of the form.

Top of Form: Taxpayer Identification

The header asks for your name, your spouse’s name (if filing jointly), and both Social Security numbers, exactly as they appear on the IT 1040.

Type or print in black ink, last name first if filling by hand, and use the SSN format 123-45-6789 with dashes. Marcus Reed enters Reed, Marcus and 123-45-6789 in the top boxes, and his wife Janet Reed enters her SSN below.

The most common edge case is a name change after marriage or divorce. If your 2025 W-2s carry your old name but your federal 1040 carries your new name, use the new name on IT-2023 and file Form SS-5 with the Social Security Administration to update Social Security records before the next return.

The most common mistake is mismatching the spouse SSN order between the IT 1040 and IT-2023, which causes the Department’s matching system to reject the credit and issue a Notice of Adjustment. The misconception is that the Department “knows who you are” from the federal return — it does not, because the matching key is the SSN-and-line-position combination, not the name.

Residency Status Box

Check exactly one box: Nonresident or Part-year resident. Full-year residents do not file IT-2023.

A nonresident lived outside Ohio for all 365 days of 2025 and had no Ohio domicile. A part-year resident moved in or out and lists the move date on the next line. Aisha Patel moved from Pittsburgh to Columbus on June 1, 2025, so she checks Part-year resident and writes 06/01/2025 as her Ohio residency start date.

The edge case is a service member stationed in Ohio under military orders. Under the Servicemembers Civil Relief Act, military pay keeps the home-state domicile, so an Army sergeant from Texas stationed at Wright-Patterson AFB checks Nonresident even though she physically lives in Ohio.

The mistake people make is checking Part-year resident when they only visited Ohio for work without changing domicile. Domicile changes require intent to remain plus physical presence — a 60-day work assignment is not a residency change. The misconception is that “where I slept most nights” controls domicile; intent controls domicile, and intent is shown by driver’s license, voter registration, vehicle registration, and primary home location.

Part A, Line 1: Wages, Salaries, Tips (Federal Form 1040, Line 1z)

This line asks for total wages from your federal return and the Ohio share of those wages.

Column A holds the federal total (1040 line 1z). Column B holds the Ohio portion — wages physically earned while working in Ohio or while an Ohio resident. Column C is the non-Ohio portion (Column A minus Column B). Carlos Mendoza earned $90,000 total, of which $30,000 was earned during four months working at his employer’s Cleveland office. He writes 90,000 in Column A, 30,000 in Column B, and 60,000 in Column C.

The edge case is a remote worker living in a reciprocal state. Ohio has reciprocal agreements with Indiana, Kentucky, Michigan, Pennsylvania, and West Virginia under ORC 5747.05(A)(2), so a Pennsylvania resident working remotely for an Ohio employer reports $0 of Ohio-source wages even if the W-2 shows Ohio withholding — and files Form IT 4NR with the employer to stop the withholding.

The common mistake is using W-2 Box 16 (state wages) instead of actual days worked in Ohio. Box 16 is often pre-populated by payroll software based on the employer’s location, not the employee’s work location, which over-allocates to Ohio. The misconception is that “if Ohio tax was withheld, the wages are Ohio wages” — withholding tells you nothing about sourcing, only about the employer’s payroll setup.

Part A, Line 2: Interest and Dividends

This line splits federal interest and ordinary dividend income between Ohio and elsewhere.

Column A is the federal total from Schedule B. For nonresidents, the Ohio portion in Column B is generally zero because intangible income (interest and dividends) is sourced to the owner’s state of domicile under ORC 5747.20(B)(1). Janet Reed, a Florida resident with a $4,200 dividend from an Ohio-based mutual fund, writes 4,200 in Column A and 0 in Column B.

The edge case is interest tied to an Ohio business. If the interest comes from a note held by an Ohio sole proprietorship or pass-through entity, it becomes Ohio business income and does belong in the Ohio column.

The mistake is assuming dividends from Ohio-based corporations like Procter & Gamble are Ohio-source. They are not — the corporation pays Ohio tax on its earnings, but the shareholder dividend is intangible income sourced to the shareholder’s domicile. The misconception is that “Ohio company” equals “Ohio income” for the shareholder; it does not.

Part A, Line 3: Business Income (Schedule C, Schedule E pass-through)

This line carries net business income and requires Part B apportionment if the business operates in more than one state.

Column A is the federal Schedule C net profit or the K-1 ordinary business income. Column B is the Ohio-apportioned share calculated using the Part B ratio (or the K-1’s Ohio apportionment percentage). Marcus Reed has $120,000 of K-1 income from a partnership operating in Ohio and Indiana with an Ohio apportionment ratio of 0.4500. He writes 120,000 in Column A and 54,000 in Column B (120,000 × 0.4500).

The edge case is a single-state Ohio business. If 100% of activity occurs in Ohio, no apportionment is needed and Column B equals Column A. If 0% occurs in Ohio, Column B equals zero and Part B is skipped.

The mistake is using the prior-year apportionment ratio without recalculating. Property, payroll, and sales factors shift every year, and a stale ratio understates or overstates the Ohio credit. The misconception is that the K-1’s apportionment percentage from the entity is optional — it is not; pass-through partners must use the entity’s own factors under ORC 5747.21.

Part A, Line 4: Capital Gains and Losses

This line splits capital gain or loss between Ohio and non-Ohio sources.

Column A is the federal total from Schedule D, line 16. Column B includes only gain or loss from the sale of Ohio real property or from the sale of an interest in an Ohio pass-through entity. Aisha Patel sold a Cincinnati rental house for a $25,000 gain and sold Apple stock for a $10,000 gain. She writes 35,000 in Column A and 25,000 in Column B because the stock gain is intangible and sourced to her domicile.

The edge case is a like-kind exchange under IRC §1031. The deferred gain is not taxed in Ohio in the year of exchange, but Ohio tracks the basis carryover, so a future taxable sale of the replacement property remains Ohio-source if the original was Ohio property.

The mistake is including gain on a primary residence sale without applying the Section 121 exclusion first. The federal exclusion ($250,000 single, $500,000 married) reduces Schedule D before it reaches IT-2023. The misconception is that capital gains on stocks held in an Ohio brokerage account are Ohio-source; brokerage location is irrelevant — domicile controls.

Part A, Line 5: Rents and Royalties

This line covers rental real estate income from Schedule E and royalty income.

Column A is the Schedule E total. Column B is rental income from Ohio-located properties only, calculated property by property. Marcus Reed owns a duplex in Toledo (net rental income $8,000) and a duplex in Detroit (net rental income $6,500). He writes 14,500 in Column A and 8,000 in Column B.

The edge case is a vacation rental that crosses tax years. Rent collected in December 2025 for a January 2026 stay is 2025 income on a cash-basis return, even though the use is in 2026.

The mistake is netting losses across states. If the Toledo property lost $2,000 and the Detroit property earned $6,500, the Ohio column shows (2,000) — a negative — not zero. The misconception is that rental losses are always passive and disallowed; Ohio follows the federal passive activity rules from IRC §469, so allowed federal losses are allowed in Ohio.

Part A, Line 6: Pension, IRA, and Annuity Distributions

This line carries retirement distributions from federal Form 1040 line 4b and 5b.

Column A is the taxable federal total. Column B is generally zero for nonresidents because 4 U.S.C. §114 prevents states from taxing the retirement income of nonresidents. Janet Reed, a Florida resident receiving a $40,000 pension from her former Ohio employer, writes 40,000 in Column A and 0 in Column B.

The edge case is a part-year resident who received a lump-sum distribution. The portion received while an Ohio resident is Ohio-source; the portion received after the move-out date is not.

The mistake is letting tax software pre-fill Box B with the federal amount because the 1099-R lists Ohio as the payer state. Payer state is irrelevant — the federal source-tax law overrides. The misconception is that an Ohio pension automatically generates Ohio tax for the retiree no matter where they live; it does not, by federal statute.

Part A, Line 7: Other Income (Federal Form 1040, Schedule 1)

This line catches gambling winnings, jury duty, prizes, and miscellaneous income reported on Schedule 1.

Column A is the Schedule 1 total. Column B includes gambling winnings from Ohio casinos (sourced under ORC 5747.063), jury duty paid by an Ohio court, and prizes won in Ohio. Carlos Mendoza won $5,000 at a Cleveland casino and $1,200 in a Las Vegas tournament. He writes 6,200 in Column A and 5,000 in Column B.

The edge case is unemployment compensation. For a part-year resident, the share received during the Ohio residency period is Ohio-source even though the issuing state may be different.

The mistake is omitting Ohio gambling winnings because they fall below the casino’s W-2G reporting threshold. Ohio taxes the first dollar of winnings, not just reportable jackpots. The misconception is that gambling losses can offset Ohio winnings on IT-2023; losses are an itemized deduction on the federal return and do not reduce Ohio-source income on Part A.

Part A, Line 8: Adjustments to Income (Federal Form 1040, Schedule 1, Line 26)

This line captures federal above-the-line adjustments such as the deductible portion of self-employment tax, HSA contributions, and IRA contributions.

Column A is the federal Schedule 1 line 26 total. Column B is the share allocable to Ohio income — typically the same ratio as the gross income that produced the deduction. Marcus Reed paid $4,800 of deductible SE tax tied to his partnership income, with a 0.4500 Ohio ratio. He writes 4,800 in Column A and 2,160 in Column B.

The edge case is a student loan interest deduction. It is allocated based on the borrower’s residency during the months the interest was paid, not the school’s location.

The mistake is allocating 100% of the deduction to Ohio when only part of the underlying income is Ohio-source. The misconception is that Ohio “doesn’t care” about adjustments because they are above-the-line on the federal return; Ohio cares because the credit is a ratio, and the denominator includes adjusted gross income.

Part A, Line 9: Ohio Adjusted Gross Income

This line is the math line: subtract Column B adjustments from Column B income.

Add lines 1 through 7 in Column B, then subtract Column B line 8. The result is the Ohio portion of federal AGI. Aisha Patel’s Column B sum is $58,500, less $1,200 of adjustments, for a Line 9 result of 57,300.

The edge case is a negative number — yes, Column B can be negative if rental losses or capital losses outweigh other income. Write the negative in parentheses.

The mistake is forgetting to subtract the adjustments and instead adding them. The misconception is that Line 9 should equal Ohio “taxable” income; it equals Ohio adjusted gross income, which is before Ohio’s own deductions and exemptions.

Part B, Line 1: Property Factor

Part B starts the three-factor apportionment for business income. Property is the average of beginning-of-year and end-of-year owned property at original cost, plus rented property at eight times annual rent.

Column 1 is Ohio property. Column 2 is everywhere property. The ratio is Column 1 ÷ Column 2, carried to four decimal places. Marcus Reed’s partnership had $400,000 of Ohio property and $1,000,000 everywhere, giving a ratio of 0.4000.

The edge case is intangible property such as patents or trademarks — these are excluded from the property factor under ORC 5747.21(B)(1).

The mistake is using net book value instead of original cost. Ohio uses original cost without depreciation. The misconception is that a leased office is excluded; rented property is included at 8× annual rent.

Part B, Line 2: Payroll Factor

Payroll is total compensation paid to employees whose services are performed in Ohio, divided by total compensation everywhere.

Column 1 is Ohio payroll. Column 2 is everywhere payroll. Marcus Reed’s partnership paid $300,000 in Ohio and $600,000 everywhere, giving 0.5000.

The edge case is a remote employee. Compensation is sourced to the state where the employee performs services, not where the employer is located, so a remote Indiana worker is not Ohio payroll even if the partnership is Ohio-based.

The mistake is including independent contractor 1099 payments in the payroll factor. Only W-2 employee compensation counts. The misconception is that owner draws count as payroll; they do not — only guaranteed payments to partners count, under ORC 5733.05.

Part B, Line 3: Sales Factor

Sales is gross receipts from Ohio customers divided by gross receipts everywhere. The sales factor is double-weighted under ORC 5747.21, making it the most influential factor.

Column 1 is Ohio sales. Column 2 is everywhere sales. Marcus Reed’s partnership had $750,000 Ohio sales and $1,500,000 everywhere, giving 0.5000.

The edge case is sales of services to a customer with offices in multiple states. The benefit-of-the-service test from ORC 5747.212 sources the receipt to the state where the customer received the benefit.

The mistake is sourcing all internet sales to the seller’s state. Ohio is a market-state for services and a destination-state for tangible goods. The misconception is that “throwback” rules apply in Ohio; Ohio uses throw-out of nowhere sales, not throwback, so sales not taxable anywhere are removed from both numerator and denominator.

Part B, Line 4: Apportionment Ratio

Add the property factor, the payroll factor, and twice the sales factor, then divide by 4.

For Marcus Reed: (0.4000 + 0.5000 + 0.5000 + 0.5000) ÷ 4 = 0.4750. Carry the result to four decimal places.

The edge case is a zero-denominator factor. If the partnership has no payroll anywhere, the payroll factor is dropped and the divisor becomes 3 instead of 4 under Ohio Adm. Code 5703-7-04.

The mistake is single-weighting the sales factor. Ohio double-weights sales by statute. The misconception is that the apportionment ratio caps at 1.0000; it can exceed 1.0000 in unusual fact patterns and you use the actual number.

Three Filled-Out Examples Using Real Scenarios

Each scenario follows one named filer through IT-2023 from start to finish. The numbers come from realistic 2025 facts and round to whole dollars.

Example 1: Aisha Patel, Part-Year Resident Who Moved Into Ohio

Aisha moved from Pittsburgh to Columbus on June 1, 2025, to start a new job. She earned $45,000 in Pennsylvania (January–May) and $55,000 in Ohio (June–December).

Form Section	What Aisha Enters
Residency status	Part-year resident, start date 06/01/2025
Line 1 wages, Column A	100,000
Line 1 wages, Column B (Ohio)	55,000
Line 2 interest/dividends, Column A	1,800
Line 2 interest/dividends, Column B	1,050 (7 of 12 months as Ohio resident)
Line 4 capital gains, Column B	25,000 (Cincinnati rental house gain)
Line 5 rents, Column B	0 (no Ohio rental during ownership of Ohio home)
Line 8 adjustments, Column B	1,200
Line 9 Ohio AGI	79,850

Aisha skips Part B because she has no business income and attaches IT-2023 to her IT 1040.

Example 2: Marcus Reed, Nonresident Partner With Ohio K-1

Marcus is a Michigan resident with a 25% interest in an Ohio partnership and rental property in Toledo. He files jointly with Janet, who has Florida-source pension income.

Form Section	What Marcus Enters
Residency status	Nonresident
Line 1 wages, Column B	0 (no Ohio wages)
Line 3 business income, Column A	120,000
Line 3 business income, Column B	54,000 (apportioned at 0.4500)
Line 5 rents, Column A	14,500
Line 5 rents, Column B	8,000 (Toledo duplex only)
Line 6 pensions, Column B	0 (federal source-tax law)
Part B Line 4 apportionment ratio	0.4500
Line 9 Ohio AGI	62,000

Marcus uses Part B to compute the 0.4500 ratio because the partnership operates in Ohio and Indiana.

Example 3: Carlos Mendoza, Reciprocal-State Remote Worker

Carlos lives in Erie, Pennsylvania, and works remotely for a Cleveland employer. His W-2 mistakenly shows Ohio withholding for the four months he traveled to the Cleveland office.

Form Section	What Carlos Enters
Residency status	Nonresident
Line 1 wages, Column A	90,000
Line 1 wages, Column B (Ohio)	30,000 (only days physically in Ohio)
Line 2 interest/dividends, Column B	0
Line 7 other income, Column B	5,000 (Cleveland casino winnings)
Reciprocal note	Files IT 4NR with employer for 2026
Refund of erroneous withholding	Claimed on IT 1040 line 14
Part B	Skipped (no business income)
Line 9 Ohio AGI	35,000

Carlos files Form IT 4NR with his employer so 2026 withholding stops. The reciprocal agreement with Pennsylvania still requires Carlos to report Ohio-source non-wage income such as the casino winnings.

How to File the Completed Form

IT-2023 is never filed by itself — it is always an attachment to the Ohio IT 1040. The filing channel you choose determines how the attachment travels with the return and what proof of filing you keep.

Online through OH|TAX eServices. Visit tax.ohio.gov/online-services, log in, choose File a Return, and follow the IT 1040 wizard, which generates IT-2023 from your data entries. There is no fee. Payment of any balance due accepts ACH debit (no fee), credit card (2.65% processor fee), or electronic check. Processing time runs 8 to 15 business days for refunds, and your proof of filing is the Confirmation Number on the final screen — print it or screenshot it.

Through commercial tax software. TurboTax, H&R Block, TaxAct, FreeTaxUSA, and Drake all support Ohio e-file. Software fees range from free (FreeTaxUSA) to about $60 per state. The IRS-Ohio e-file handshake transmits federal and state simultaneously, processing time runs 10 to 21 business days, and your proof is the software-issued e-file acknowledgment.

By paper mail with a refund or no balance. Mail to Ohio Department of Taxation, P.O. Box 2679, Columbus, OH 43270-2679. No fee. No payment included. Processing time runs 8 to 12 weeks, and your proof of filing is a USPS Certified Mail receipt with return receipt requested — the green card is the postmark you keep.

By paper mail with a balance due. Mail to Ohio Department of Taxation, P.O. Box 2057, Columbus, OH 43270-2057 with a check payable to Ohio Treasurer of State and the Ohio IT 40P payment voucher. Processing time runs 8 to 12 weeks, and your proof is the cashed check plus the certified mail receipt.

The 2025 return is due April 15, 2026. An extension to October 15, 2026 is automatic if you file federal Form 4868, but the extension only extends time to file, not time to pay. Late payments accrue interest at the rate published annually by the Tax Commissioner (5% for 2026) plus a failure-to-pay penalty of double the interest amount under ORC 5747.15.

What Happens After You File

Most returns finish processing within the timelines above. The Ohio Department of Taxation matches your IT-2023 numbers against your W-2s, 1099s, K-1s, and federal AGI. If the match passes, your refund is direct-deposited or your balance due is debited and the file closes.

If the match fails, you receive a Billing Notice or Notice of Adjustment by U.S. Mail within 60 to 180 days. The notice lists the specific line in dispute, the Department’s recalculated number, and a 60-day deadline to respond. Responses are filed through OH|TAX eServices or by mail to the address on the notice.

You can check refund status anytime at tax.ohio.gov/refund using your SSN and the exact refund amount. The “Where’s My Refund” tool updates nightly. If your refund is delayed beyond 90 days, the Department adds interest under ORC 5747.11, and you can call the Taxpayer Services line at 1-800-282-1780 to escalate.

If you discover an error after filing, file an amended return on Ohio Form IT 1040 (amended box checked) with a corrected IT-2023 attached. The statute of limitations for refunds is four years from the original due date under ORC 5747.11. The Department’s audit window for assessments is generally four years too, but it extends to seven if you omit more than 25% of your income.

Mistakes to Avoid When Filling Out the Form

Each mistake below is one the Ohio Department of Taxation flags most often during return matching.

Using W-2 Box 16 for Ohio wages instead of days worked in Ohio — over-allocates wages to Ohio and shrinks your credit.
Forgetting the K-1 apportionment ratio and using 100% — inflates Ohio business income and overstates tax owed.
Listing dividends from Ohio-based companies as Ohio-source — the Department zeros out the line and adjusts the credit upward.
Using net book value for the property factor — Ohio uses original cost, so the factor is wrong and Part B is recalculated.
Single-weighting the sales factor in Part B — produces a too-low apportionment ratio and an overstated credit.
Including capital gains on Ohio-brokerage stock as Ohio-source — the Department reclassifies as intangible and reduces Ohio income.
Treating Ohio pension income to a nonresident as Ohio-source — federal law forbids it, and the Department issues a refund of the erroneous tax.
Skipping IT-2023 and claiming the credit only on the Schedule of Credits — the credit is denied entirely and the full tax becomes due.
Mismatching SSN order between IT 1040 and IT-2023 — the matching engine rejects the credit pending paper review.
Filing IT-2023 without attaching it to the IT 1040 — the Department processes the IT 1040 first, denies the credit, and bills the difference.
Using stale prior-year apportionment factors — the audit kicks back when current-year K-1 numbers do not match.
Forgetting Ohio gambling winnings under the W-2G threshold — the casino reports the cumulative figure and the Department adds the omitted amount.

Do’s and Don’ts

These rules of thumb come from years of watching returns clear or get adjusted.

Do confirm your federal AGI on Form 1040 line 11 before opening IT-2023, because every Column A number traces back to the federal return and any federal change cascades through Ohio.
Do keep a written work paper that shows how you allocated each line, because the Department can request it during an audit and a contemporaneous work paper is the strongest defense.
Do use the Ohio K-1 (IT K-1) apportionment percentages issued by the entity, because the Department cross-checks partner returns against entity-level filings.
Do file electronically when possible, because e-filed returns clear in 8–15 business days versus 8–12 weeks for paper.
Do attach explanations for unusual items on a separate sheet labeled “IT-2023 Statement,” because explanations attached upfront prevent later notices.
Do save a PDF of the final IT-2023 alongside the IT 1040 for at least seven years, because Ohio’s extended audit window for omitted income reaches seven years.

The flip side of every “do” is a habit that reliably triggers letters.

Don’t rely on tax software defaults for sourcing, because software often classifies based on payer state instead of work or domicile state.
Don’t assume reciprocity covers all income, because reciprocity covers wages only and not gambling, rental, or business income.
Don’t round to the nearest hundred — Ohio expects whole-dollar entries to the dollar, and large rounding suggests estimation.
Don’t treat IT-2023 as optional even if your credit comes out small, because filing the form documents the calculation and protects you if the Department later challenges the credit.
Don’t delay the IT 4NR to your reciprocal-state employer, because every month of erroneous Ohio withholding requires a separate refund step.
Don’t sign and file before reviewing each Column B entry against its source document, because most adjustments trace to a single line that was never traced back.

Pros and Cons of Filing on Your Own vs. With Help

The decision turns on the complexity of your sourcing, not the size of your refund.

Pros of filing on your own.

It is free or nearly free through OH|TAX eServices, so the entire return costs nothing if your federal return is also self-filed.
You learn the form, which makes next year’s return faster and gives you an audit-ready understanding of every number.
You control the timeline and can file the moment your last W-2 or K-1 arrives, instead of waiting in a preparer’s queue.
You avoid preparer errors, which are common with multi-state returns because not every preparer handles Ohio sourcing rules well.
You get the full refund without paying a percentage to a paid preparer who advances the refund.

Cons of filing on your own.

Multi-state K-1 income with apportionment is technical, and a single Part B mistake can shift thousands in credit.
Reciprocal-state rules are subtle, and self-filers often miss the IT 4NR step that fixes the next year’s withholding.
Audit defense is harder without a preparer who can correspond with the Department on your behalf under a power of attorney.
The time investment is real — a typical IT-2023 takes two to four hours of careful work for a complex multi-state filer.
Software can mask sourcing errors by carrying figures forward without flagging conceptual mistakes.

When professional help is worth the fee. A licensed Ohio CPA or Ohio Department of Taxation-registered preparer typically charges $250–$600 for a multi-state Ohio return with IT-2023. That fee is worth it if you have K-1 income from multiple states, you sold an Ohio property, or you switched residency mid-year with significant income on each side of the move date.

FAQs

Do I file IT-2023 if I lived in Ohio all year?

No. Full-year Ohio residents do not file IT-2023; the form exists only for nonresidents and part-year residents claiming the credit on the Schedule of Credits.

Do I file IT-2023 if I live in a reciprocal state and only have Ohio wages?

No. Wage-only filers from Indiana, Kentucky, Michigan, Pennsylvania, or West Virginia file IT 1040 plus IT 4NR with the employer, not IT-2023, unless they also have non-wage Ohio income.

Do I write my Ohio wages from W-2 Box 16 on Line 1, Column B?

No. Use the actual wages earned for days physically worked in Ohio (or earned during Ohio residency for a part-year filer); Box 16 is often payroll-system pre-fill and is not authoritative.

Do nonresidents owe Ohio tax on dividends from an Ohio company?

No. Dividends are intangible income sourced to the shareholder’s state of domicile under ORC 5747.20(B)(1), regardless of where the issuing corporation is based.

Yes or no — must I use Part B if my K-1 already shows Ohio apportionment?

No. When the IT K-1 shows the entity’s Ohio apportionment percentage, you carry it to Line 3, Column B and skip Part B for that entity.

Do I list the gain from selling my Ohio rental house in Column B?

Yes. Gain on Ohio real property is Ohio-source for any owner, resident or not, under ORC 5747.20(B)(2), and it goes on Line 4, Column B.

Do I include my federal Section 121 home-sale exclusion before Line 4?

Yes. The Section 121 exclusion reduces Schedule D before any number reaches IT-2023, so only the taxable portion shows in Column A and Column B.

Do I include gambling losses to offset my Cleveland casino winnings on Line 7?

No. Gambling losses are itemized deductions on the federal Schedule A and never reduce Ohio-source winnings on IT-2023.

Do I file a separate IT-2023 for each state I worked in?

No. One IT-2023 per IT 1040 covers all states; you split the federal totals into Ohio (Column B) and not-Ohio (Column C), regardless of how many other states are involved.

Yes or no — does the apportionment ratio cap at 1.0000?

No. The ratio is a math result and can exceed 1.0000 in rare cases; you enter the actual computed number to four decimals.

Do I attach my federal 1040 to IT-2023?

No. Ohio receives federal data through the IRS; you do not need to attach the federal return, but keep a copy for your files.

Yes or no — can I e-file IT-2023 by itself?

No. IT-2023 only e-files as part of the IT 1040 return; standalone e-filing of IT-2023 is not supported by OH|TAX eServices or any commercial software.

Do I owe Ohio tax on a pension paid by my former Ohio employer if I now live in Florida?

No. Federal law at 4 U.S.C. §114 prevents states from taxing the retirement income of nonresidents, so your Florida-resident pension is not Ohio-source.

Do I need to update my IT 4NR every year?

Yes. Ohio’s reciprocal exemption form is filed once with each new employer and re-filed any time your residency changes; it does not auto-renew if you switch jobs.

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