Ohio Form C-1 is the Application for Ohio Workers’ Compensation Coverage that every Ohio employer must file with the Ohio Bureau of Workers’ Compensation (BWC) within seven days of hiring a first employee. The form opens an employer policy under Ohio Revised Code Chapter 4123, assigns a manual classification, sets the estimated premium, and pulls the employer into Ohio’s monopolistic state-fund system.
Filing the C-1 wrong, or filing it late, can trigger lapse penalties, personal liability for an injured worker’s medical bills, and back premiums plus interest. According to BWC’s most recent annual report, more than 249,000 active private employer policies sit in the state fund, and BWC processes roughly 30,000 new C-1 applications each year, with rejection or correction rates above 15% on first submission.
Here is what you will learn in this guide:
- 📋 Exactly what each box on the current revision of Form C-1 asks for, in plain English
- 🧾 The eight documents you must gather before opening the form
- 💻 How to file the C-1 through the BWC e-account portal, by mail, by fax, and in person
- ⚠️ The ten most common mistakes that get C-1 applications kicked back
- 👷 Three full-walkthrough scenarios using a food-truck LLC, a manufacturing corporation, and a sole-proprietor contractor
What Form C-1 Is and Who Must File It
Ohio Form C-1 is the official application that opens a workers’ compensation policy with the Ohio Bureau of Workers’ Compensation. Ohio is one of only four monopolistic state-fund states, which means employers cannot buy private workers’ comp insurance for Ohio employees. The C-1 is the only door into legal coverage, and the Ohio Revised Code section 4123.35 makes that coverage mandatory for nearly every employer with one or more workers.
Every Ohio employer with at least one employee must file. That includes corporations, S-corps, LLCs, partnerships, sole proprietors with employees, nonprofits, churches with paid staff, and household employers who hire nannies or caretakers. Out-of-state employers sending workers into Ohio for more than a handful of days each year also file C-1 to obtain “other-states” coverage. Sole proprietors, partners, and LLC members without employees may file voluntarily to elect coverage on themselves under ORC 4123.01(A)(2).
The form sets four things in motion at once. It assigns one or more NCCI manual classification codes that drive the premium rate, it captures estimated payroll for the first policy year, it collects the non-refundable $120 application fee, and it locks in the official date coverage begins. Coverage starts the day BWC receives the completed C-1 and fee, not the day work began, so a late C-1 leaves a gap of uninsured days the employer is personally liable for.
A common misconception is that small employers, family-only businesses, or “1099 contractors” do not need a policy. BWC and Ohio courts apply a right-to-control test that often reclassifies 1099 workers as employees, and family members on payroll count too. The safer read is that if you cut anyone a paycheck for labor performed in Ohio, you file C-1.
Before You Start: Documents and Information You Need
The C-1 takes about 20 minutes to complete if your paperwork is in front of you, and several hours if it is not. The application asks for legal entity details, federal identifiers, Ohio nexus dates, payroll estimates, and signature blocks that have to match other government records exactly. Mismatches between your C-1 and your IRS or Ohio Secretary of State records are the single biggest cause of rejected applications.
Gather these eight items before you open the PDF or the BWC e-account portal:
- Federal Employer Identification Number (FEIN) from your IRS SS-4 confirmation letter, because BWC validates the FEIN against IRS records and a typo halts processing.
- Ohio Secretary of State charter or registration number from the Ohio Business Search, needed for corporations, LLCs, LPs, and nonprofits.
- Legal entity name and trade name (DBA) exactly as filed, because BWC will reject the C-1 if “Smith Trucking LLC” is entered as “Smith Trucking Inc.”
- Date of first Ohio employment, which is the day your first worker performed compensable labor in Ohio and which sets the seven-day filing clock under ORC 4123.35.
- Estimated 12-month payroll for each job classification, because under-estimating triggers a true-up audit and over-estimating ties up cash in premium deposits.
- Officer, owner, member, or partner names with Social Security numbers, ownership percentages, and titles, because BWC validates these against Ohio Secretary of State filings.
- Description of business operations in two or three sentences, used by BWC’s classification unit to assign the correct manual code.
- Payment method for the $120 application fee — credit card, ACH, or check payable to “Ohio Bureau of Workers’ Compensation.”
If you skip any of these, expect either a phone call from a BWC underwriter or a written request for additional information that delays coverage by 10 to 30 days. During those days, every hour your employees work is uninsured.
Where to Get the Form and How to Access It
The official C-1 PDF lives on BWC’s forms library. You can download Form C-1 here, and the current revision date is printed in the lower-left corner of page one. Always verify you have the current revision, because BWC updates the form whenever statutes, rates, or classification rules change, and prior versions are often rejected.
Most employers now file online through the BWC employer e-account. Creating the e-account takes about five minutes and requires an email address, a phone number, and the FEIN. Once inside, the online application mirrors the paper C-1 field-for-field, but it auto-validates the FEIN, auto-populates Secretary of State data, accepts the $120 fee by credit card or ACH, and emails a policy number within minutes for clean applications.
Paper filers can mail the completed C-1 with a check to Ohio Bureau of Workers’ Compensation, P.O. Box 15567, Columbus, OH 43215-0567, or fax it to 614-719-5310. In-person filing is available at any BWC customer service office, including the William Green Building at 30 W. Spring Street, Columbus, OH 43215. Spanish-speaking filers can request assistance through BWC’s bilingual line at 1-800-644-6292.
A misconception worth correcting: downloading the form does not start coverage. Coverage starts only when BWC receives both the completed C-1 and the $120 fee. Until then, the policy does not exist, no matter how complete the paperwork sitting on your desk is.
Step-by-Step: How to Fill Out Ohio Form C-1 Line by Line
The current C-1 is a four-page application split into seven numbered sections. Walk through each field in order, because later sections pull data from earlier ones. The walkthrough below uses the exact field names and box numbers printed on the official BWC C-1 PDF.
Section 1, Box 1 — Legal Name of Employer
This box asks for the full legal name of the business as it appears on your IRS SS-4 letter and Ohio Secretary of State filing. Type or print in all capital letters with no abbreviations unless your registered name uses them. If your entity is Maria Lopez Catering, LLC, you write MARIA LOPEZ CATERING, LLC — comma, “LLC,” and all.
A specific example: Carlos Reyes registered his food truck as Reyes Tacos LLC with the Ohio Secretary of State on March 2, 2026, so on Box 1 he writes REYES TACOS LLC.
The most common edge case is a sole proprietor with no entity. In that case you enter the owner’s full legal name (e.g., DEREK J. WILLIAMS) and use the trade name field in Box 2 for the DBA.
A common mistake here is entering the trade name instead of the legal name, which causes BWC’s automated FEIN match to fail and the application to drop into manual review. Manual review adds 10 to 21 days to processing.
A misconception filers carry into Box 1 is that punctuation does not matter. It does — BWC matches the legal name character-by-character against IRS records, and a missing comma before “LLC” can flag the application.
Section 1, Box 2 — Trade Name or DBA
Box 2 captures the public-facing name customers see, which may differ from the legal name. If you operate under a DBA registered with the Ohio Secretary of State, enter that name here exactly as the DBA certificate reads. If you have no DBA, leave the box blank rather than repeating Box 1.
For example, Reyes Tacos LLC operates under the trade name El Camion Rojo, so Carlos writes EL CAMION ROJO in Box 2.
The edge case to watch for is multiple DBAs. The C-1 has room for one trade name, so list the primary DBA here and attach a separate sheet listing additional ones, which BWC will index under the same policy number.
A common mistake is putting a DBA in Box 1 and leaving Box 2 blank. That misroutes the policy and makes it nearly impossible for an injured employee’s medical provider to bill the right policy later.
A misconception is that a DBA creates a separate workers’ comp policy. It does not — every DBA under the same legal entity rolls under one C-1 and one policy number.
Section 1, Box 3 — Federal Employer Identification Number
Box 3 asks for the nine-digit FEIN issued by the IRS, formatted XX-XXXXXXX. Enter the dash. If you are a sole proprietor with no employees other than yourself and no FEIN, you may enter your Social Security number here, but BWC strongly prefers a FEIN.
For example, Reyes Tacos LLC’s FEIN from the IRS SS-4 letter is 87-3219045, so Carlos writes 87-3219045 in Box 3.
The edge case is a brand-new entity that has not received its IRS letter yet. You can apply for an EIN online in about 15 minutes and receive the number immediately, so do that before filing C-1.
A common mistake is transposing two digits in the FEIN, which causes the IRS cross-match to fail and triggers a written request for proof of FEIN. That delay routinely runs 14 to 30 days.
A misconception is that the FEIN and the Ohio charter number are interchangeable. They are not — Box 3 is federal, Box 4 is state, and BWC validates each against a different database.
Section 1, Box 4 — Ohio Secretary of State Charter Number
Box 4 captures the entity registration number from the Ohio Secretary of State Business Search. Corporations, LLCs, LPs, and nonprofits all have one. Sole proprietors operating under their own name leave this blank.
For example, Reyes Tacos LLC’s charter number is 4823917, so Carlos enters 4823917.
An edge case is foreign entities — corporations or LLCs formed in another state but doing business in Ohio. They must be registered as foreign entities with the Ohio Secretary of State, and the foreign registration number goes in Box 4.
A common mistake is entering the Federal EIN in this box. That triggers a structural error and bounces the application back instantly through the e-portal or within five days through the mail.
A misconception is that newly formed entities can leave this blank “for now.” They cannot. If your entity type requires Secretary of State registration, BWC will not issue a policy without that number.
Section 1, Box 5 — Business Mailing Address
Box 5 takes the mailing address where you want BWC to send invoices, audit notices, and correspondence. P.O. boxes are accepted here. Format the address on three lines: street or P.O. box, city, two-letter state code, ZIP+4 if known.
For example, Carlos uses his accountant’s address: 4421 N HIGH ST STE 200, COLUMBUS, OH 43214-2837.
The edge case is multi-location employers. List the headquarters address here and use Box 6 for the physical work site address, because BWC routes safety inspections by physical address, not mailing address.
A common mistake is using a residential address that changes when you move. BWC mails the annual true-up notice and lapse warnings to this address, and a missed notice can lapse your policy and expose you to personal liability under ORC 4123.75.
A misconception is that updating the address with the IRS or Secretary of State updates it with BWC. It does not — you must file a Form U-3 address change separately.
Section 1, Box 6 — Primary Ohio Work Location
Box 6 captures the physical street address where Ohio work is performed. Do not use a P.O. box here. If work happens at multiple sites or at customer locations, list the principal place of business and attach a sheet listing the rest.
For example, Reyes Tacos parks the truck nightly at 1287 OAK ST, COLUMBUS, OH 43205, so that goes in Box 6.
The edge case is mobile employers like food trucks, traveling contractors, and home-health agencies. Use the garage, depot, or office address as the primary location, and add a note that work is performed statewide.
A common mistake is leaving Box 6 blank for “remote” workers. BWC still needs a physical Ohio address to assign a safety field office and to route inspections, even for fully remote staff.
A misconception is that Box 6 sets the workers’ comp jurisdiction. The jurisdiction is set by where the employee actually works, not by Box 6, but the box drives BWC’s internal routing.
Section 2, Box 7 — Type of Business Entity
Box 7 is a checkbox grid covering sole proprietorship, partnership, LLC (single-member or multi-member), C-corporation, S-corporation, nonprofit corporation, government entity, and “other.” Check exactly one box. The choice drives which officer-coverage rules apply.
For example, Carlos checks LLC – Multi-Member because Reyes Tacos has two members, Carlos and his sister Lucia.
The edge case is an LLC taxed as an S-corporation. Check the LLC box, not the S-corp box, because BWC follows the entity’s legal form, not its tax election.
A common mistake is checking “sole proprietor” when the business is actually a single-member LLC. The two have different officer-coverage defaults — sole proprietors are excluded by default, single-member LLC members are included by default.
A misconception is that this box can be changed later by phone. It can be corrected, but only with a Form U-117 entity change and supporting Secretary of State documentation.
Section 2, Box 8 — Date of First Ohio Employment
Box 8 is the single most important date on the form. Enter the date your first employee performed compensable work in Ohio, formatted MM/DD/YYYY. This date starts the seven-day filing clock under ORC 4123.35.
For example, Carlos hired his first cook on 04/15/2026, so Box 8 reads 04/15/2026.
The edge case is acquiring an existing business. The date of first Ohio employment for the new owner is the date of acquisition, not the date the original business hired its first worker, and a Form U-118 successorship must accompany the C-1.
A common mistake is back-dating Box 8 to “clean up” a late filing. BWC cross-checks against Ohio Department of Job and Family Services unemployment records, and a mismatch triggers an audit and potential fraud referral.
A misconception is that the date of first hire is the date the offer was signed. It is not — it is the first day the worker actually performed labor.
Section 3, Boxes 9–14 — Officer, Owner, Member, and Partner Information
This block captures every owner, partner, member, or corporate officer with name, title, SSN, ownership percentage, and an “include/exclude” coverage checkbox. Corporate officers are included by default and must affirmatively elect out using Form U-3S. Sole proprietors and partners are excluded by default and must elect in.
For example, Carlos lists himself as CARLOS REYES, MEMBER, SSN 123-45-6789, 60%, INCLUDE and his sister as LUCIA REYES, MEMBER, SSN 987-65-4321, 40%, EXCLUDE.
The edge case is a family-farm partnership where multiple relatives co-own. Each partner gets a row, and BWC accepts up to six rows on the form before requiring an attachment.
A common mistake is listing a spouse who is not a legal owner. Only legal owners go in this section; employed spouses go on the payroll roster.
A misconception is that elective coverage is free. Including yourself adds your assumed payroll (capped between BWC’s minimum and maximum reportable wages) to the premium calculation.
Section 4, Boxes 15–18 — Description of Operations and Manual Classification
Box 15 asks for a written description of what the business does. Be specific. “Restaurant” is too vague. “Mobile food truck preparing and serving Mexican street food at outdoor events and a fixed lunch route” gives BWC enough to assign the correct manual code.
Boxes 16, 17, and 18 ask for proposed NCCI manual classification codes, estimated annual payroll per code, and number of employees per code. If you do not know the codes, leave them blank — BWC’s classification unit will assign them based on Box 15.
For example, Carlos writes manual 9082 Restaurant – NOC with estimated payroll of $78,000 across two employees.
The edge case is a business with multiple distinct operations, like a contractor who also runs a retail showroom. Each operation gets its own manual code and its own payroll line, and BWC will not let you blend them under one code to lower premium.
A common mistake is under-estimating payroll to lower the initial deposit. BWC trues up at year-end, and large under-estimates trigger interest charges plus a late-payroll-report penalty.
A misconception is that manual codes are negotiable. They are not — they are governed by BWC’s National Council on Compensation Insurance scopes manual and assigned by classification rules, not by employer preference.
Section 5, Box 19 — Prior Coverage History
Box 19 asks whether the entity, its owners, or its predecessors ever held a BWC policy. Check yes or no. If yes, enter the prior policy number and the reason coverage ended (canceled, lapsed, sold, dissolved).
For example, Carlos checks No because Reyes Tacos LLC was formed in 2026 and none of its members held prior BWC coverage.
The edge case is a successor employer buying a business. Check yes, list the predecessor’s policy number, and attach Form U-118 so BWC can transfer experience and rate.
A common mistake is checking no when an owner had a prior business that lapsed with unpaid premium. BWC’s common-control rule under ORC 4123.32 attaches that old debt to the new policy, so hiding it does not work and counts as a material misstatement.
A misconception is that lapsed prior policies are erased after a few years. They are not — BWC keeps policy history indefinitely, and unpaid balances survive entity dissolution.
Section 6, Box 20 — $120 Application Fee
Box 20 confirms payment of the $120 non-refundable application fee. Online filers pay by credit card or ACH at submission. Paper filers attach a check or money order made payable to Ohio Bureau of Workers’ Compensation with the policy applicant’s legal name written in the memo line.
For example, Carlos pays online with a business debit card and the e-portal stamps Box 20 automatically.
The edge case is fee waivers — there are none. Even nonprofits and government entities pay the $120.
A common mistake is sending the fee separately from the application. BWC will hold the C-1 in suspense until the fee posts, and “suspense” means uninsured days continue to accrue.
A misconception is that the fee is the first premium installment. It is not — it is a separate, non-refundable filing fee, and the first premium installment comes due after BWC issues the policy.
Section 7, Box 21 — Signature, Title, and Date
Box 21 requires the original signature of an owner, partner, member, or corporate officer with authority to bind the entity. Print name, title, and date in MM/DD/YYYY format below the signature line. Electronic signatures are accepted in the e-portal under Ohio’s Uniform Electronic Transactions Act.
For example, Carlos signs as CARLOS REYES, MEMBER, 04/22/2026.
The edge case is a CPA or attorney filing on behalf of the employer. They sign only if they hold a BWC-recorded power of attorney (Form AC-2); otherwise the owner must sign.
A common mistake is signing in the wrong title — for example, an LLC member signing as “President.” Title mismatches with Secretary of State filings get the application bounced.
A misconception is that an unsigned C-1 can be corrected later by phone. It cannot — BWC will not process an unsigned application and will mail it back.
Three Filled-Out Examples Using Real Scenarios
The three filers below show how the C-1 looks in three of the most common real-world fact patterns BWC sees: a small LLC food truck, a mid-sized manufacturing corporation, and a sole-proprietor contractor electing self-coverage.
Scenario 1 — Carlos Reyes, Reyes Tacos LLC (Multi-Member Food Truck)
| Form Section | What Carlos Enters |
|---|---|
| Box 1 — Legal Name | REYES TACOS LLC |
| Box 2 — Trade Name | EL CAMION ROJO |
| Box 3 — FEIN | 87-3219045 |
| Box 4 — Ohio Charter | 4823917 |
| Box 7 — Entity Type | LLC – Multi-Member |
| Box 8 — First Ohio Employment | 04/15/2026 |
| Boxes 9–14 — Owners | Carlos Reyes (Member, 60%, Include); Lucia Reyes (Member, 40%, Exclude) |
| Box 15 — Description | Mobile Mexican food truck operating in Franklin County |
| Boxes 16–18 — Manual & Payroll | 9082 Restaurant NOC, $78,000, 2 employees |
| Box 20 — Fee | $120 paid by business debit card |
| Box 21 — Signature | Carlos Reyes, Member, 04/22/2026 |
Scenario 2 — Janet Whitaker, Buckeye Precision Manufacturing Inc. (25-Employee Corporation)
| Form Section | What Janet Enters |
|---|---|
| Box 1 — Legal Name | BUCKEYE PRECISION MANUFACTURING INC |
| Box 2 — Trade Name | (blank) |
| Box 3 — FEIN | 34-5567812 |
| Box 4 — Ohio Charter | 2118903 |
| Box 7 — Entity Type | C-Corporation |
| Box 8 — First Ohio Employment | 01/06/2026 |
| Boxes 9–14 — Officers | Janet Whitaker (President, 55%, Include); Mark Whitaker (VP, 30%, Include); David Lin (Secretary, 15%, Exclude via U-3S) |
| Box 15 — Description | CNC machining of precision aerospace parts |
| Boxes 16–18 — Manual & Payroll | 3632 Machine Shop NOC, $1,420,000, 25 employees |
| Box 19 — Prior Coverage | No |
| Box 20 — Fee | $120 paid by ACH |
| Box 21 — Signature | Janet Whitaker, President, 01/12/2026 |
Scenario 3 — Derek Williams, Williams Roofing (Sole Proprietor Electing Self-Coverage)
| Form Section | What Derek Enters |
|---|---|
| Box 1 — Legal Name | DEREK J WILLIAMS |
| Box 2 — Trade Name | WILLIAMS ROOFING |
| Box 3 — FEIN | 46-7781233 |
| Box 4 — Ohio Charter | (blank — sole proprietor) |
| Box 7 — Entity Type | Sole Proprietor |
| Box 8 — First Ohio Employment | 03/03/2026 |
| Boxes 9–14 — Owner | Derek J. Williams (Owner, 100%, Include via elective coverage) |
| Box 15 — Description | Residential roof tear-off and replacement |
| Boxes 16–18 — Manual & Payroll | 5551 Roofing, $164,000, 3 employees plus owner |
| Box 19 — Prior Coverage | No |
| Box 20 — Fee | $120 paid by check #1042 |
| Box 21 — Signature | Derek J. Williams, Owner, 03/06/2026 |
Beyond these three, two other named filers help round out the picture. Aisha Patel runs Lighthouse Community Services, an Ohio nonprofit hiring its first paid case manager — she checks “Nonprofit Corporation” in Box 7 and pays the same $120 fee no charity exemption applies. Marcus Tate operates Tate Logistics, an Indiana LLC sending drivers across the Ohio border, and he files C-1 to obtain Ohio coverage even though his headquarters sit in Indianapolis.
How to File the Completed Form
You have four channels to file the C-1, and each one has its own address, fee mechanism, processing time, and proof-of-filing. Coverage begins the day BWC receives both the application and the fee, so the fastest channel is almost always the right one.
Online through the BWC e-account portal. No mailing address — file at the URL. Fee is $120 paid by credit card or ACH at submission. Processing time is typically minutes to 24 hours for clean applications. Proof of filing is the on-screen confirmation number and the email receipt BWC sends within 15 minutes; save both.
By mail to Ohio Bureau of Workers’ Compensation, P.O. Box 15567, Columbus, OH 43215-0567. Fee is $120 by check or money order payable to Ohio Bureau of Workers’ Compensation. Processing time runs 10 to 21 business days from postmark. Proof of filing is USPS Certified Mail with return receipt — pay the extra $4.85 for Certified, because lost paper applications are the leading cause of “lapsed-from-day-one” disputes.
By fax to 614-719-5310. Fee cannot be paid by fax, so you mail or call in the $120 separately, which delays coverage until both arrive. Processing runs 7 to 14 business days after fee posts. Proof of filing is the fax confirmation page plus the canceled check.
In person at any BWC customer service office. Fee is $120 by check, money order, or credit card at the counter. Processing typically completes the same business day for clean applications. Proof of filing is the date-stamped copy the clerk hands back — keep it in your permanent business file.
A misconception worth flagging: faxing the C-1 does not start coverage until the $120 fee posts. Until BWC stamps “policy issued,” every hour of work is uninsured.
What Happens After You File
Within 24 hours of a clean online filing, or 10 to 21 days of a clean paper filing, BWC issues a seven-digit policy number and a Certificate of Ohio Workers’ Compensation Coverage. Print the certificate and post it where employees can read it, because ORC 4123.83 requires conspicuous posting.
The policy runs on a July 1 to June 30 policy year for private employers and a January 1 to December 31 policy year for public employers. Premium installment notices arrive on a bi-monthly schedule, and a True-Up Report is due each August 15 reconciling estimated payroll against actual payroll for the prior policy year. Missing the true-up costs you the BWC group rating discount for the following year, which can mean a 30% to 50% premium spike.
If BWC’s classification unit needs more information, you receive a written Classification Inquiry letter or a phone call from an underwriter within 5 to 10 business days. Respond fast, because the policy stays in “pending classification” status until you do, and that status complicates injury claim adjudication if a worker gets hurt during the gap.
A common misconception is that the C-1 is a one-and-done filing. It is not — every entity change, ownership change, address change, or new operation triggers a follow-on filing on the BWC forms library, and skipping those forms creates a paper-trail mismatch that surfaces during the first audit.
Mistakes to Avoid When Filling Out the Form
The following ten errors account for the bulk of C-1 rejections, audit findings, and lapse penalties. Each one is avoidable with five extra minutes of review.
- Missing the seven-day filing window. Coverage gaps under ORC 4123.35 leave the employer personally liable for any injury that occurs before BWC receives the C-1.
- Entering a trade name in Box 1. The application fails the IRS FEIN match and drops to manual review for 10 to 21 days.
- Skipping the $120 fee. BWC holds the application in suspense until the fee posts, and uninsured days keep accruing.
- Under-estimating payroll in Box 17. The August true-up reconciles the gap with interest charges and a possible late-report penalty.
- Misclassifying a 1099 contractor as not an employee. BWC’s right-to-control test reclassifies, then assesses back premium plus 50% under ORC 4123.75.
- Wrong entity-type checkbox in Box 7. Officer-coverage defaults flip wrong, exposing the owner to either uncovered injuries or unnecessary premium.
- Listing only some owners in Section 3. BWC discovers omitted owners during audit and reassesses premium back to Box 8’s date.
- Using a residential mailing address that changes. Missed lapse warnings result in policy lapse and personal liability for any injury during the lapse.
- Signing without authority. An unauthorized signature voids the application and forces a full refile.
- Entering Social Security number in the FEIN box. Fails IRS validation and bounces the application.
Do’s and Don’ts
A short rules-of-the-road list keeps the C-1 on track from the moment you open the PDF to the moment BWC stamps the policy.
Do’s:
- Do download the current C-1 PDF every time, because revision dates change and old versions are rejected.
- Do verify the FEIN against the IRS SS-4 letter character-by-character, because typos cost two to three weeks.
- Do file online through the e-account portal when speed matters, because online filings issue policy numbers in hours, not weeks.
- Do save the BWC confirmation email and policy certificate to a permanent file, because you will need both for bank loans, contractor bids, and IRS audits.
- Do estimate payroll honestly and slightly high, because over-estimates refund at true-up but under-estimates accrue interest.
- Do post the Certificate of Coverage in a conspicuous workplace location, because ORC 4123.83 requires it.
Don’ts:
- Don’t backdate Box 8, because BWC cross-checks against ODJFS unemployment records and mismatches trigger fraud review.
- Don’t pay the fee separately from the application, because suspense status delays coverage and stretches uninsured days.
- Don’t guess at manual codes, because incorrect codes cost more to fix at audit than to leave blank for BWC to assign.
- Don’t list a spouse as an owner unless they are legally one, because false ownership claims are material misstatements under ORC 2921.13.
- Don’t rely on a 1099 designation to skip coverage, because BWC’s right-to-control test will likely reclassify.
- Don’t forget the Form U-3S officer election if a corporate officer wants to opt out, because corporate officers are included by default.
Pros and Cons of Filing on Your Own vs. With Help
Most small employers file the C-1 themselves, and BWC’s e-portal is built for that. Larger employers, multi-state employers, and high-hazard operations often hire a CPA, third-party administrator, or workers’ comp attorney.
Pros of filing on your own:
- Saves the $250 to $1,500 a TPA or CPA charges to file a single C-1.
- Forces the owner to learn the form, which pays off at every annual true-up.
- Online filing through the BWC e-account takes about 20 minutes for a simple operation.
- Direct communication with BWC underwriters, who tend to call the owner first for missing information.
- Easier to integrate with the owner’s existing payroll software, since the data points are already there.
Cons of filing on your own:
- Wrong manual code assignment can cost thousands in over-premium that compounds year after year.
- Missing a Form U-3S election leaves a corporate officer covered when they did not want to be, or vice versa.
- DIY filers rarely catch successorship opportunities under Form U-118, which can transfer favorable experience modifiers.
- No advocate when BWC challenges a classification or assesses back premium.
- Lost on the rules surrounding group rating and retrospective rating, which can drop premium 30% or more.
- Higher rate of paperwork errors that cause coverage delays.
Form C-1 vs. Related BWC Filings at a Glance
| Form | When You File It |
|---|---|
| C-1 Application for Coverage | Within 7 days of first Ohio employment, to open a policy under ORC 4123.35 |
| U-3 Address Change | Whenever the mailing or work-site address changes |
| U-3S Officer Election | Whenever a corporate officer or LLC member elects in or out of coverage |
| U-117 Entity Change | Whenever the entity type changes (e.g., sole prop to LLC) |
| U-118 Successorship | Whenever a business is acquired, merged, or restructured |
| Payroll True-Up | Every August 15 to reconcile estimated and actual payroll |
FAQs
Do I have to file Form C-1 if I only have one part-time employee? Yes. ORC 4123.01 defines “employer” as anyone with one or more workers, full or part time, so a single part-time employee triggers the filing requirement.
Can I file the C-1 before my first employee starts work? Yes. BWC encourages pre-employment filing; coverage begins the day BWC receives the application and fee, so filing a few days early closes any gap.
Is the $120 application fee refundable if BWC denies my application? No. The $120 fee is non-refundable under BWC’s fee schedule, even if the application is rejected for incomplete information.
Do I write my SSN or my FEIN in Box 3 if I am a sole proprietor with no employees? No, SSN is not preferred. Apply for a free EIN online and use the FEIN, because BWC’s matching system works better with FEINs.
Should I list a spouse who works in the business but does not own it in Section 3? No. Section 3 captures owners, partners, members, and corporate officers only; an employed spouse goes on the regular payroll roster, not in the ownership boxes.
Do I need to check “include” for myself as a sole proprietor in Box 9? No by default. Sole proprietors are excluded from coverage unless they affirmatively elect in by checking “include” and accepting the assumed payroll.
Can I file Form C-1 if my LLC was formed today and has no FEIN yet? No. Get the FEIN first through the IRS online EIN tool; BWC will not issue a policy without a valid FEIN in Box 3.
Do out-of-state employers sending workers into Ohio occasionally still need to file? Yes. Any non-Ohio employer with employees performing work in Ohio for more than a brief, isolated period must file C-1 and obtain Ohio coverage under ORC 4123.54.
Is there an exemption for nonprofits or churches? No. Nonprofits, churches with paid staff, and 501(c)(3) charities all file C-1 and pay the same $120 fee, with no exemption from coverage or filing.
Can I sign the C-1 electronically through the e-portal? Yes. Electronic signatures are valid under Ohio’s Uniform Electronic Transactions Act and BWC’s e-portal accepts them as the original signature.
Do I list my home address in Box 6 if I run the business from my house? Yes. A home-based business uses the home address in Box 6 as the primary work location; that information stays internal to BWC and is not posted publicly.
Should I leave manual classification codes in Boxes 16–18 blank if I do not know them? Yes. BWC’s classification unit will assign codes from your Box 15 description, and that is more reliable than guessing at codes from the NCCI scopes manual.
Can my CPA sign the C-1 on my behalf? No, unless your CPA holds a BWC-recorded power of attorney; without Form AC-2 on file, the owner or an authorized officer must sign personally.
Is a 1099 contractor really exempt from coverage? No, not automatically. BWC applies a right-to-control test and reclassifies many 1099 workers as employees, then assesses back premium plus penalties.
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