An income self-attestation form is a signed statement in which you declare your expected earnings when you cannot produce standard proof like pay stubs, W-2s, or tax returns. To complete one, you calculate your projected annual net income, enter it along with your name, date of birth, and application ID, sign under penalty of perjury, and submit the form to the agency that requested it. Most people encounter this form through the ACA marketplace or Medicaid, where federal rules allow attestation as a fallback when electronic data and paper documents both come up short.
When Attestation Is Allowed
Medicaid and marketplace agencies are required to check electronic sources first: IRS records, Social Security Administration data, and state wage databases. Only when those sources are empty or conflict with what you reported does the agency ask you for paperwork, and only when you cannot provide paperwork does self-attestation become the option.1eCFR. 42 CFR Part 435 Subpart J – Income and Eligibility Verification Under 42 CFR § 435.945, agencies may accept attestation from the individual, an adult household member, an authorized representative, or someone acting for a minor.2eCFR. 42 CFR 435.945 – General Requirements
One boundary worth knowing before you start: SNAP does not accept self-attestation for income. It requires verification for every applicant, though it does allow attestation for household size and shelter expenses. If you are applying for food assistance, the process below does not apply to your income figure.
What to Gather Before You Fill It Out
Marketplace attestation forms typically ask for your full name, date of birth, application ID, and the total annual income your household expects during the coverage year.3HealthCare.gov. Annual Income Letter of Explanation The income figure is where accuracy matters most. Before you sit down with the form, pull together:
- Income records: bank statements showing deposits, invoices you have sent, payment app histories from Venmo, PayPal, or Cash App, and any 1099s you have received.
- Expense records: receipts, mileage logs, supply costs, and other business expenses. Most programs base eligibility on net income, not gross.
- Household details: the number of people in your tax household and their income, which determines your federal poverty level bracket. For 2026, the FPL for an individual is $15,960 and for a family of four it is $33,000.4HealthCare.gov. Federal Poverty Level (FPL)
- Contact information for anyone who paid you, in case the agency requests third-party verification.
If you are self-employed, the IRS requires you to report all business income and claim all allowable business expenses. You cannot skip deductions to inflate your income for a larger tax credit.5Internal Revenue Service. Earned Income, Self-Employment Income and Business Expenses Deductible items commonly include supplies, vehicle costs, home office use, and materials directly tied to the work. Subtract those from gross earnings to get the net figure you will enter on the form.
Calculating Projected Income When Your Earnings Are Irregular
The form asks for projected annual income for the coverage year, which is straightforward when you earn the same amount every month and difficult when you don’t. Most people filling out this form fall in the second group.
Start with whatever records you have. If you have been working for several months, total your documented income, subtract allowable expenses, and annualize the result. Six months of $9,000 in net earnings projects to $18,000 for the year. The word “projected” is doing work here: you are estimating what you expect to earn for the full year, not adding up what you already earned. If a slow season is coming or a new contract is starting, factor it in.
Avoid rounding to convenient numbers. Agencies compare your figure against electronic data, and a suspiciously round number with no supporting paperwork invites scrutiny. Use actual dollar amounts drawn from your records. A self-employment ledger tracking dates, descriptions, and amounts for each transaction strengthens your case significantly if your records are otherwise thin. The format can be a spreadsheet, accounting software, or a handwritten notebook. Consistency and detail matter more than format.
Signing Under Penalty of Perjury
The signature line carries a penalty-of-perjury declaration. By signing, you certify that everything on the form is true to the best of your knowledge. Two federal statutes govern false statements on these forms:
- 18 U.S.C. § 1621 (perjury): willfully signing a false statement under penalty of perjury can result in up to five years in prison, a fine up to $250,000, or both.6Office of the Law Revision Counsel. 18 U.S.C. Chapter 79 – Perjury7Office of the Law Revision Counsel. 18 U.S.C. 3571 – Sentence of Fine
- 18 U.S.C. § 1001 (false statements): knowingly making false statements to a federal agency carries the same maximum of five years and fines under the general sentencing provisions.8Office of the Law Revision Counsel. 18 U.S.C. 1001 – Statements or Entries Generally
Beyond criminal exposure, an agency that later discovers inflated or fabricated numbers will demand repayment of any benefits paid on that basis. Check your math before signing.
Notarization is generally not required. The penalty-of-perjury certification substitutes for a notary’s acknowledgment on federal marketplace and Medicaid forms. Some state or local programs use different rules, so read the instructions on the form you were sent.
How to Submit the Form
For ACA marketplace applications, uploading through HealthCare.gov is the fastest route. Log in, open the application matching your application ID, choose “Application details,” find the data matching issue listed on your account, select “Upload documents,” pick the document type, and upload. The site accepts PDF, JPEG, PNG, TIFF, and BMP files up to 10 MB.9HealthCare.gov. How Do I Upload a Document?
To mail a paper copy, send photocopies rather than originals to:
Health Insurance Marketplace
Attn: Coverage Processing
465 Industrial Blvd
London, KY 40750-00019HealthCare.gov. How Do I Upload a Document?
Include the bar code page from your eligibility notice. If you don’t have it, write your printed name and application ID on the submission. Certified mail gives you a tracking number as proof of delivery. Medicaid applications handled by a state agency use different submission channels; check your state department of health or human services for the correct address or portal.
What Happens After You Submit
Caseworkers compare the income figure you provided against available electronic records, including IRS data and state wage databases. If your number is “reasonably compatible” with what those sources show, the agency accepts your attestation and processes your application.10eCFR. 42 CFR 435.952 – Use of Information and Requests for Additional Information
For marketplace applications, “reasonably compatible” has a specific meaning: if your attested income is within 10 percent of what IRS tax data shows, the marketplace must accept your figure. If the gap is larger, or if no tax data exists for you, the marketplace tries alternative data sources first, then issues a data matching inconsistency (DMI) notice asking you for documentation.
Once a DMI is issued, you have 90 days from the date of the eligibility notice to resolve it. If you cannot gather the records in time, an additional 60-day extension is available by calling the Marketplace Call Center and showing you have made a good-faith effort to obtain them.11CMS. How to Resolve Income Data Matching Inconsistencies (DMIs) If you don’t respond, the marketplace may adjust your financial assistance to match whatever its own data shows, which could reduce or end your subsidy.
Reconciling Your Attestation at Tax Time
If you received advance premium tax credits (APTC) through the marketplace based on your attestation, you must reconcile those payments against your actual income when you file, using IRS Form 8962.12Internal Revenue Service. About Form 8962, Premium Tax Credit This is where an under- or over-estimate turns into real money.
If your actual income came in higher than what you attested, you received more APTC than you were entitled to and must repay the excess. Repayment is capped based on your household income as a percentage of the FPL:13Internal Revenue Service. Instructions for Form 8962 (2025)
- Below 200% FPL: capped at $375 (single) or $750 (other filing statuses).
- 200% to below 300% FPL: capped at $975 (single) or $1,950 (other).
- 300% to below 400% FPL: capped at $1,625 (single) or $3,250 (other).
- 400% FPL or above: no cap. You repay the full excess.
If your actual income came in lower, you may be owed an additional premium tax credit as a refund. Either way, skipping Form 8962 when you received APTC can delay your refund or trigger IRS follow-up. Report as accurately as you can on the attestation, and treat the reconciliation as the safety net for projections that inevitably miss.
Keeping Records After You Submit
Keep copies of the completed form, the ledger or records you used to calculate your income figure, any confirmation emails or tracking numbers from submission, and the eligibility notice you receive back. Agencies can request additional verification at any point during the benefit period, and organized records make responding straightforward.
For self-employment specifically, the IRS expects timely records of all business income and expenses.5Internal Revenue Service. Earned Income, Self-Employment Income and Business Expenses A running ledger should include dates, descriptions of each transaction, whether the entry is income or expense, and a running net total. The same ledger supports your attestation if the agency questions it and backs up your Schedule C at tax time. Building the habit while you are filling out this form saves considerable trouble if an audit or IRS data match flags you later.