Colorado Form 112, officially the DR 0112 C Corporation Income Tax Return, is the form every C corporation doing business in Colorado uses to report its income and pay state income tax to the Colorado Department of Revenue. If your business is taxed as a C corporation and it earns money tied to Colorado, you file this form. The version covered here is the 2024 DR 0112, revised 10/11/24, so check that date in the top corner of your form before you start.
Getting this form right matters because Colorado taxes a flat 4.25% of your Colorado taxable income, and a wrong number on a single line can flow through five pages and change what you owe. Colorado processes hundreds of thousands of business returns each year, and the Colorado Department of Revenue flags returns where the federal taxable income reported does not match what the IRS shares. This guide walks you through every box so you can file with confidence.
Here is what you will learn:
- 🧾 What Form 112 is, who must file it, and the statute that requires it
- 📂 The exact documents and numbers to gather before you open the form
- ✍️ A line-by-line walkthrough of all five pages with sample entries
- 👥 Three full filled-out examples using real-world corporations
- ⚠️ The most common mistakes that trigger holds, penalties, and interest
What the Form Is and Who Must File It
Colorado Form 112 is the state income tax return for C corporations, and it mirrors the federal corporate return in structure while applying Colorado’s own rules. The form is required under section 39-22-301, C.R.S., which imposes income tax on corporations doing business in the state. You start with your federal taxable income, adjust it with Colorado additions and subtractions, then apply the flat rate to reach your tax. The form is built so the Colorado number always traces back to a federal number you already reported to the IRS.
You must file Form 112 if your corporation is a C corporation that is doing business in Colorado, has income from Colorado sources, or is otherwise subject to Colorado tax. A C corporation includes any entity taxed as a C corp for federal purposes, even a single-owner business that elected C corp treatment. S corporations file the DR 0106 instead, and partnerships also use the DR 0106, so Form 112 is only for the C corporation world. Tax-exempt organizations with unrelated business income use Form 112 too, starting from Form 990-T instead of Form 1120.
The form connects to several other Colorado documents. If you do business in more than one state, you attach the DR 0112RF to apportion income. If you are part of an affiliated group, you attach Schedule C. Nonrefundable credits flow in from the DR 0112CR, and estimated payments are made on the DR 0112EP during the year. Understanding which companions you need before you start saves you from filing an incomplete return.
A common misconception is that a corporation with no Colorado profit does not have to file. In truth, a corporation doing business in Colorado generally must file a return even when it owes nothing, because the filing itself is the legal record. Skipping the return because you owe zero can still draw a non-filer notice from the Department.
Before You Start: Documents and Information You Need
Gather everything before you open the form, because Form 112 pulls numbers from your federal return and your Colorado account, and hunting for them mid-filing leads to errors. Having each item ready also lets you double-check that names and numbers match across documents, which is exactly what the Department cross-references. Here is your pre-filing checklist.
- Completed federal Form 1120 (or Form 990-T for exempt organizations). Line 30 of the 1120 is the starting number on Form 112, so the federal return must be done first; without it you cannot fill line 1.
- Colorado Account Number (CAN). This is your state tax ID; a missing or wrong CAN can misroute your return or delay any refund.
- Federal Employer ID Number (FEIN). The Department matches this against IRS data, and a mismatch triggers a processing hold.
- Prior-year Colorado return. You need it to pull forward net operating losses and any estimated-tax carryforward; without it you may understate deductions.
- Estimated tax payment records (DR 0112EP). These go on line 27, and missing payments mean you pay twice or face a false balance due.
- Apportionment data (sales by state). If you operate in multiple states, you need Colorado and total receipts for the DR 0112RF; missing this overstates Colorado income.
- Credit certificates and schedules. Enterprise zone, CHIPS, energy, and other credits each need their own form attached; without the backup, the Department disallows the credit.
- NAICS business code and the year you began Colorado operations. These identifying details appear in the signature section, and leaving them blank can flag the return as incomplete.
- Bank routing and account numbers. Needed for direct deposit of a refund or electronic payment; a wrong digit sends your refund to the wrong account.
Where to Get the Form and How to Access It
The official Form 112 lives on the Colorado Department of Revenue forms page, where you can download the fillable PDF along with the 112 booklet instructions. Always pull the form for the correct tax year, because each year has its own version and the revision date printed in the top corner tells you which edition you hold. Using last year’s PDF for this year’s filing is a frequent and avoidable error.
The fastest way to access and file the form is through Colorado Revenue Online, the state’s free filing portal. Through Revenue Online you can complete the return, attach schedules, pay electronically, and receive instant confirmation. The portal also pulls in your account details, which cuts down on transcription mistakes.
If you prefer software, most major tax-preparation programs support the DR 0112 and will e-file it to Colorado for you. Approved software handles the math on each line and carries figures between schedules, which reduces arithmetic errors. You can also print the PDF, fill it in by hand or on screen, and mail it.
Remember that the Department tells you plainly on the form: Do not submit federal return, forms or schedules when filing this return. Colorado already receives your federal data from the IRS, so attaching the 1120 only adds bulk and can slow processing. Attach only the Colorado schedules the form specifically requires.
Step-by-Step: How to Fill Out Form 112 Line by Line
This section is the heart of the guide. Work through the form in the order the boxes appear, and use the exact field names printed on the DR 0112. Sample entries below are shown in italics so you can tell them apart from instructions.
Header: Tax Period, Name, and Identifying Numbers
The top of page 1 asks for your Fiscal Year Beginning (MM/DD/24) and Fiscal Year Ending (MM/DD/YY), the Name of Corporation, Address, City/State/ZIP, your Colorado Account Number (CAN), and your Federal Employer ID Number (FEIN). Calendar-year filers leave the fiscal-year boxes blank or enter 01/01/24 and 12/31/24; fiscal-year filers enter their actual dates. Enter the corporation’s full legal name exactly as registered, then its CAN and FEIN in their boxes.
For example, Mile High Widgets Inc. enters its name, its CAN 12345678, and its FEIN 84-1234567. If your corporation closed during the year, mark the Mark for Final Return box so the Department stops expecting future returns. A common mistake here is entering a trade name instead of the legal name, which can cause the return to not match your registration and stall processing.
A misconception is that the FEIN and CAN are interchangeable. They are not: the FEIN is your federal number and the CAN is your Colorado number, and each box must hold the correct one or the Department cannot match your account.
Box A: Apportionment of Income
Box A asks how your income is split between Colorado and other states, and you mark one option. The choices are (42) a corporation not apportioning income, (43) a corporation apportioning income using receipts-factor apportionment (DR 0112RF required), (44) a corporation using a special rule (DR 0112RF required), (46) a corporation claiming an exemption under P.L. 86-272, and (47) other apportionment method. Mark box 42 if all your business is in Colorado.
For example, Mile High Widgets Inc., which sells only in Colorado, marks box 42. A multistate seller like Summit Software Corp. marks box 43 and attaches the DR 0112RF. The most common mistake is marking box 42 while actually selling into other states, which overstates Colorado income and the tax you owe.
A misconception is that having customers in other states automatically lets you apportion. Apportionment under box 43 requires you to be taxable in another state and to complete the receipts-factor schedule; simply shipping product elsewhere is not always enough.
Box B: Separate, Consolidated, or Combined Filing
Box B asks whether you file alone or as part of a group. Options include a single corporation filing a separate return, an affiliated group required to file a combined return (Schedule C required), an affiliated group electing to file a consolidated report (Schedule C required, election binding for four years), and a combined return that includes another consolidated group. Mark the one that fits your structure, and if you are making or continuing a consolidated election, enter the Year of election (YYYY).
For example, a standalone business like Mile High Widgets Inc. marks single corporation. A parent with subsidiaries, Front Range Holdings Inc., marks the combined-return box and attaches Schedule C. The key mistake is electing consolidated filing without realizing it locks you in for four years, which can cost you if your group structure changes.
A misconception is that “combined” and “consolidated” mean the same thing. Combined filing is required when statutory tests are met, while consolidated filing is an elective four-year choice; mixing them up leads to filing under the wrong rules.
Lines 1–3: Federal Taxable Income
Line 1 asks for your federal taxable income from Federal form 1120 line 30, or Form 990-T, Part I, line 11. Copy that exact number; this is the foundation of the entire return. Line 2 asks for federal taxable income of companies not included in this return, used by groups to remove non-Colorado members. Line 3 is net federal taxable income, which you get by subtracting line 2 from line 1.
For example, Mile High Widgets Inc. reports federal taxable income of $500,000 on line 1, has no excluded companies so enters 0 on line 2, and carries $500,000 to line 3. The common mistake is pulling the wrong 1120 line, such as gross income instead of line 30, which throws off every later figure.
A misconception is that you can start from book income or net profit. The form starts from federal taxable income after federal adjustments, so using your accounting profit instead of the 1120 line 30 figure produces a wrong return.
Lines 4–8: Additions
Lines 4 through 7 add back items Colorado does not allow as deductions, and line 8 totals them with line 3. Line 4 is the federal net operating loss deduction, added back because Colorado computes its own NOL. Line 5 is the Colorado income tax deduction, added back because you cannot deduct the state’s own tax. Line 6 is business meals deducted under section 274(k), and line 7 is other additions with an explanation attached.
For example, Mile High Widgets Inc. deducted $8,000 of state income tax federally, so it enters $8,000 on line 5, has no other additions, and its line 8 becomes $508,000. A frequent mistake is forgetting to add back the Colorado income tax deduction on line 5, which understates Colorado income and underpays tax.
A misconception is that additions are optional cleanup items. They are mandatory adjustments under Colorado law, and skipping a required add-back like the state tax deduction is an underreporting error the Department can correct with penalty and interest.
Lines 9–13: Subtractions
Lines 9 through 12 subtract income Colorado does not tax, and line 13 totals them. Line 9 is exempt federal interest, such as U.S. Treasury interest. Line 10 is excludable foreign source income. Line 11 is the Colorado Marijuana and Natural Medicine Business Deduction. Line 12 is other subtractions, which requires a written explanation in the space provided.
For example, Mile High Widgets Inc. earned $3,000 of U.S. Treasury interest, so it enters $3,000 on line 9 and its line 13 totals $3,000. The common mistake is claiming a subtraction on line 12 without the required explanation, which causes the Department to disallow it and recompute the tax.
A misconception is that any federal exemption automatically reduces Colorado income. Only the specific subtractions Colorado allows belong here, so listing an item Colorado does not recognize will be removed on review.
Lines 14–18: Taxable Income
Line 14 is modified federal taxable income, found by subtracting line 13 from line 8. Line 15 is Colorado taxable income before the net operating loss deduction, which for an apportioning corporation reflects the Colorado share. Line 16 is the Colorado net operating loss deduction, split into 16(a) for losses from years before January 1, 2018, 16(b) the remainder after 16(a), 16(c) for losses from years on or after January 1, 2018, and 16(d) the total of (a) and (c). Line 17 is the carryforward deduction from tax year 2021 under HB21-1002, and line 18 is Colorado taxable income after subtracting lines 16(d) and 17 from line 15.
For example, Mile High Widgets Inc. has no NOLs, so line 14 is $505,000, line 15 is $505,000, line 16(d) is 0, and line 18 is $505,000. The biggest mistake here is mixing pre-2018 and post-2018 NOLs, because the two vintages follow different limitation rules and putting a post-2018 loss on line 16(a) overstates the deduction.
A misconception is that Colorado NOLs equal federal NOLs. Colorado computes its own loss based on Colorado taxable income, so the federal NOL figure you added back on line 4 is not the number you carry to line 16.
Line 19: Tax
Line 19 asks for the tax, which is 4.25% of the amount on line 18. Multiply line 18 by 0.0425 and round to the nearest dollar. This single rate applies to all C corporation income, so there are no brackets to worry about.
For example, Mile High Widgets Inc. multiplies its line 18 of $505,000 by 4.25% to get $21,463 on line 19. The common mistake is using an old rate; Colorado’s corporate rate has changed in recent years, and applying a prior rate gives the wrong tax.
A misconception is that the rate is applied to federal taxable income. The 4.25% applies to Colorado taxable income on line 18, after all additions, subtractions, apportionment, and loss deductions, not to the federal figure on line 1.
Lines 20–24: Nonrefundable Credits and Net Tax
Lines 20 through 23 hold nonrefundable credits, and line 24 computes net tax. Line 20 is the sum of nonrefundable credits from DR 0112CR line 28B. Line 21 is nonrefundable Enterprise Zone credits from the DR 1366. Line 22 is nonrefundable CHIPS Zone Credits from the DR 1370. Line 23 is the Strategic Capital tax credit from DR 1330. The sum of lines 20 through 23 cannot exceed the tax on line 19, and each requires its supporting form attached. Line 24 is net tax: subtract that sum from line 19.
For example, Summit Software Corp. claims a $2,000 enterprise zone credit on line 21, attaches its DR 1366, and reduces its tax accordingly on line 24. The common mistake is claiming more nonrefundable credit than the tax on line 19, which the Department caps, leaving you with a smaller benefit than expected.
A misconception is that nonrefundable credits can create a refund. They can only reduce tax to zero; any excess is lost or carried forward depending on the credit, so they never put cash back in your pocket by themselves.
Lines 25–26: Recapture and Subtotal
Line 25 is the recapture of prior year credits, which adds back credits you claimed before but no longer qualify for. Line 26 is the sum of lines 24 and 25. Recapture commonly applies when property tied to a credit is sold or removed from service early.
For example, Front Range Holdings Inc. sold equipment that earned a credit two years ago, so it enters $1,200 of recapture on line 25 and adds it to line 24 for line 26. The common mistake is ignoring recapture after disposing of credit-generating property, which understates tax and invites a later assessment.
A misconception is that once a credit is claimed it is permanent. Many credits carry conditions, and breaking those conditions forces recapture, so a credit is only final once its holding or use requirements are met.
Lines 27–43: Payments and Refundable Credits
These lines record what you already paid and the refundable credits you claim. Line 27 is estimated tax, extension payments, and credits. Line 28 is W-2G withholding from lottery winnings (attach the W-2G). Lines 29 through 43 cover refundable credits such as the Gross Conservation Easement Credit (line 29, DR 1305G), Innovative Motor Vehicle Credit (line 30, DR 0617), Business Personal Property Credit (line 31), and many others, each requiring its own attached form.
For example, Mile High Widgets Inc. paid $20,000 in estimated tax during the year and enters that on line 27 with no other payments. The common mistake is forgetting estimated payments on line 27, which makes the return show a large balance due even though you already paid.
A misconception is that refundable and nonrefundable credits go in the same place. Refundable credits belong in lines 29 through 43 and can generate a refund, while nonrefundable ones sit in lines 20 through 23 and cannot, so placing them in the wrong block changes your result.
Lines 44–49: Net Tax Due, Penalty, and Interest
Line 44 is the sum of lines 27 through 43, your total payments and refundable credits. Line 45 is net tax due, found by subtracting line 44 from line 26. Line 46 is penalty, line 47 is interest, and line 48 is the estimated tax penalty due. Line 49 is the total due, the sum of lines 45 through 48.
For example, Mile High Widgets Inc. has line 26 tax of $21,463 and line 44 payments of $20,000, leaving $1,463 net tax due on line 45, with no penalty or interest if filed on time, so line 49 is $1,463. The common mistake is leaving penalty and interest blank when filing late, which the Department then adds itself, often higher than expected.
A misconception is that an extension to file is an extension to pay. Colorado grants an automatic six-month filing extension, but the tax is still due on the original date, so unpaid tax accrues interest from that original deadline.
Lines 50–52: Overpayment and Refund
Line 50 is overpayment, found by subtracting line 26 from line 44 when payments exceed tax. Line 51 is the amount from line 50 to carry forward to next year’s estimated tax, and line 52 is the amount to be refunded. You split your overpayment between carryforward and refund however you choose.
For example, if Summit Software Corp. overpaid by $3,000, it might put $1,000 on line 51 toward next year and $2,000 on line 52 for a refund. The common mistake is failing to split correctly so that lines 51 and 52 do not add up to line 50, which delays processing.
A misconception is that a carryforward is automatic. You must affirmatively enter the amount on line 51; if you leave it blank, the whole overpayment is treated as a refund and nothing applies to next year.
Direct Deposit and Sections C–H
The direct deposit block asks for your Routing Number, account Type (Checking or Savings), and Account Number for a refund or payment. Section C asks who the corporation’s books are in care of, Section D the NAICS business code, Section E the year the corporation began doing business in Colorado, Section F whether the paid preparer may discuss the return, Section G the kind of business in detail, and Section H whether the IRS made adjustments or you filed amended federal returns in the last four years.
For example, Mile High Widgets Inc. enters its routing number, marks Checking, lists its NAICS code 339999, and answers No to the IRS-adjustment question in Section H. The common mistake is a wrong digit in the routing or account number, which sends a refund astray and is hard to recover.
A misconception is that Section H can be skipped if you think it does not apply. You must answer Yes or No; leaving it blank can flag the return as incomplete, and answering wrongly about an IRS adjustment can later look like a failure to disclose.
Signature Block
The bottom of the return requires the Signature or Title of Officer and the Date (MM/DD/YY), signed under penalties of perjury in the second degree. An authorized officer must sign, and if a paid preparer completed the return, their name, firm, and address go in the preparer section.
For example, Maria Chen, CFO of Mile High Widgets Inc., signs as officer and dates the return 05/14/25. The common mistake is filing without a signature, which makes the return invalid and treated as not filed, exposing you to late-filing penalties.
A misconception is that anyone in the company can sign. The form requires an officer with authority to bind the corporation, so a signature from an unauthorized employee does not satisfy the requirement.
Three Filled-Out Examples Using Real Scenarios
Below are three common situations, each following one corporation through the key sections of Form 112. Use them as templates for your own facts.
Scenario 1: Mile High Widgets Inc. — single in-state corporation, not apportioning
| Form Section | What Mile High Widgets Enters |
|---|---|
| Box A Apportionment | Marks 42, a corporation not apportioning income |
| Box B Filing type | Single corporation filing a separate return |
| Line 1 Federal taxable income | $500,000 |
| Line 5 Colorado income tax deduction | $8,000 |
| Line 8 Sum of additions | $508,000 |
| Line 9 Exempt federal interest | $3,000 |
| Line 18 Colorado taxable income | $505,000 |
| Line 19 Tax at 4.25% | $21,463 |
| Line 27 Estimated payments | $20,000 |
| Line 49 Total due | $1,463 |
Scenario 2: Summit Software Corp. — multistate corporation using receipts-factor apportionment
| Form Section | What Summit Software Enters |
|---|---|
| Box A Apportionment | Marks 43, receipts-factor apportionment, attaches DR 0112RF |
| Box B Filing type | Single corporation filing a separate return |
| Line 1 Federal taxable income | $1,200,000 |
| DR 0112RF receipts factor | Colorado $900,000 of total $4,500,000 = 20% |
| Line 15 Colorado taxable income before NOL | $240,000 |
| Line 18 Colorado taxable income | $240,000 |
| Line 19 Tax at 4.25% | $10,200 |
| Line 21 Enterprise Zone credit | $2,000, attaches DR 1366 |
| Line 27 Estimated payments | $9,000 |
| Line 50 Overpayment | $800 |
Scenario 3: Front Range Holdings Inc. — affiliated group filing a combined return
| Form Section | What Front Range Holdings Enters |
|---|---|
| Box A Apportionment | Marks 43, receipts-factor apportionment, attaches DR 0112RF |
| Box B Filing type | Affiliated group required to file combined, attaches Schedule C |
| Line 1 Federal taxable income | $3,000,000 combined |
| Line 2 Income of companies not included | $500,000 |
| Line 3 Net federal taxable income | $2,500,000 |
| Line 18 Colorado taxable income | $1,000,000 |
| Line 19 Tax at 4.25% | $42,500 |
| Line 25 Recapture of prior year credits | $1,200 |
| Line 27 Estimated payments | $45,000 |
| Line 52 Amount to be refunded | $1,300 |
How to File the Completed Form
Colorado gives you three ways to file Form 112, and you should keep proof of filing no matter which you choose.
- Online through Revenue Online. File and pay at Colorado Revenue Online. There is no filing fee, and you can pay by electronic funds transfer or e-check directly from a bank account, or by credit card for a processing fee. Electronic returns usually process in a few weeks, and the portal gives you a confirmation number you should save as proof.
- Approved tax software. Most professional and business tax programs e-file the DR 0112 to Colorado. There is no state filing fee, payment can be scheduled electronically, and processing time is similar to Revenue Online. Keep the software’s acknowledgment of acceptance as your proof of filing.
- Paper by mail. If filing with a check or payment, mail to Colorado Department of Revenue, Denver, CO 80261-0006; if filing without a payment, mail to Colorado Department of Revenue, Denver, CO 80261-0005. Make checks payable to the Colorado Department of Revenue. These ZIP codes are exclusive to the Department, so no street address is needed. Paper returns take longer to process, so send by a trackable method and keep the mailing receipt.
The return is due the 15th day of the fourth or fifth month after your tax year ends depending on your year, and Colorado grants an automatic six-month extension to file. Remember that the extension covers filing only; any tax owed is still due on the original date, and you pay an extension payment with the DR 0158-C to avoid interest.
What Happens After You File
Once the Department receives your Form 112, it matches your return against IRS data and your Colorado account records. If everything lines up and you owe nothing more, the return simply posts and your account shows it as filed. If you claimed a refund, the Department issues it by direct deposit or check, usually within a few weeks for e-filed returns and longer for paper.
If the Department finds a mismatch, such as a federal taxable income figure that does not match IRS records or a credit without its supporting form, it sends a notice asking for documentation or proposing a change. Responding promptly with the missing schedule or an explanation usually resolves the issue. Ignoring a notice can lead to an assessment, where the Department recalculates your tax and adds penalty and interest.
The Department keeps your return open to adjustment for a limited period, and if the IRS later changes your federal income, you must file an amended Colorado return on the DR 0112X to report it. Keeping copies of your return, schedules, and proof of filing for at least four years protects you if questions arise later. Good records turn a stressful notice into a quick reply.
Mistakes to Avoid When Filling Out the Form
- Using the wrong year’s form. The Department may reject or misprocess a return filed on an outdated DR 0112.
- Pulling the wrong line from Form 1120. Starting from anything other than line 30 throws off every later figure.
- Forgetting to add back the Colorado income tax deduction on line 5. This understates income and underpays tax.
- Mixing pre-2018 and post-2018 NOLs on line 16. The two vintages follow different rules and the deduction will be wrong.
- Marking box 42 while selling in other states. This overstates Colorado income and overpays tax.
- Claiming a subtraction on line 12 without the required explanation. The Department disallows it and recomputes the tax.
- Claiming credits without attaching the supporting form. Missing the DR 0112CR, DR 1366, or other backup means the credit is denied.
- Leaving estimated payments off line 27. The return then shows a false balance due even though you paid.
- Entering a wrong routing or account number. Your refund goes to the wrong account and is hard to recover.
- Filing without an officer’s signature. An unsigned return is treated as never filed, exposing you to penalties.
- Assuming the filing extension also extends payment. Unpaid tax accrues interest from the original due date.
- Attaching the federal return. The form tells you not to, and doing so can slow processing.
Do’s and Don’ts
Do’s
- Do complete your federal Form 1120 first, because line 30 is the starting point for the entire Colorado return.
- Do confirm the revision date 10/11/24 in the corner matches the tax year you are filing, so you use the correct edition.
- Do attach every required schedule, such as the DR 0112RF or Schedule C, because the Department needs them to accept the figures.
- Do save your confirmation number or mailing receipt, since it is your proof the return was filed on time.
- Do pay any tax owed by the original due date, because the extension only delays filing, not payment.
- Do double-check your CAN and FEIN, because the Department matches these and a typo causes a hold.
Don’ts
- Don’t submit your federal return with Form 112, because the form explicitly says not to and it slows processing.
- Don’t guess at NOL amounts, because Colorado losses differ from federal and a guess invites an adjustment.
- Don’t claim more nonrefundable credit than the tax on line 19, because the excess is capped and lost.
- Don’t leave Yes/No questions in Sections F and H blank, because an incomplete return can be flagged.
- Don’t use an old tax rate, because Colorado’s 4.25% rate must match the filing year.
- Don’t let an unauthorized employee sign, because only an officer can validly sign the return.
Pros and Cons of Filing on Your Own vs. With Help
Deciding whether to file Form 112 yourself or hire a professional depends on your corporation’s complexity. The table below frames the trade-offs.
| Filing on Your Own | Filing With Professional Help |
|---|---|
| Saves money since there is no preparer fee, which helps a small single-state corporation | Costs a fee, but that cost is often small next to the tax saved on a complex return |
| Gives you full control and direct knowledge of your numbers, useful for a simple return | Brings expertise on apportionment and combined filing, which reduces costly errors |
| Works well when you only mark box 42 and have no credits, because the math is straightforward | Helps when you operate in many states, because the DR 0112RF and Schedule C get complicated |
| Builds your in-house understanding for future years, lowering long-term reliance on others | Shifts the burden of accuracy and lets you answer Department notices with backup |
| Lets you file immediately without scheduling, good when time is short | Catches missed subtractions and credits, which can pay for the fee many times over |
| Avoids sharing sensitive financials outside the company, preserving privacy | Provides representation if the Department audits or questions the return |
FAQs
Who must file Colorado Form 112?
Yes, every C corporation doing business in Colorado or earning Colorado-source income must file Form 112, even in years when it owes no tax, because the filing is the legal record.
Is Form 112 the same as the federal Form 1120?
No, Form 112 is Colorado’s own return, but it starts from your federal Form 1120 line 30 and then applies Colorado additions, subtractions, and the flat state rate.
Do I write my federal taxable income on line 1 from Form 1120 line 30?
Yes, line 1 comes directly from Form 1120 line 30, or Form 990-T Part I line 11 for exempt organizations, and using any other line creates errors.
Do I mark box 42 if all my sales are in Colorado?
Yes, box 42 is for a corporation not apportioning income, which fits a business operating only in Colorado; mark box 43 if you sell into other states.
Do I enter my CAN or my FEIN in the Colorado Account Number box?
No, that box takes only your Colorado Account Number; your FEIN goes in its own separate box, and swapping them causes a processing hold.
Do pre-2018 and post-2018 net operating losses go on the same line 16 box?
No, pre-2018 losses go on line 16(a) and post-2018 losses on line 16(c), because the two follow different limitation rules.
Is the Colorado corporate tax rate 4.25%?
Yes, line 19 applies a flat 4.25% to your Colorado taxable income on line 18, with no brackets for C corporations.
Does an extension to file also extend the time to pay?
No, Colorado grants an automatic six-month filing extension, but the tax is still due on the original date and interest runs from then.
Can nonrefundable credits on lines 20 through 23 create a refund?
No, nonrefundable credits can reduce your tax only to zero, while refundable credits on lines 29 through 43 can generate a refund.
Do I attach my federal return to Form 112?
No, the form clearly states not to submit your federal return, forms, or schedules, because Colorado already receives that data from the IRS.
Can any employee sign the return?
No, an authorized officer must sign under penalties of perjury, and an unauthorized signature can make the return invalid.
Do I need to file an amended Colorado return if the IRS changes my income?
Yes, you must file the DR 0112X to report federal adjustments, generally within the period required after the IRS change becomes final.
Can I file Form 112 for free online?
Yes, you can file and pay at no filing cost through Colorado Revenue Online, which also gives you a confirmation number as proof of filing.
Do I have to file if my corporation owed no Colorado tax this year?
Yes, a corporation doing business in Colorado generally must still file the return, because a zero-tax year does not remove the filing duty.
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