Form 3949-A: Information Referral (Report Suspected Tax Fraud)
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IRS Form 3949-A, Information Referral, is the form used to report a person or business you suspect of violating federal tax law — unreported income, false deductions, unfiled returns, or paying employees in cash off the books. You identify the person or business in Section A, describe the alleged violation in Section B, and either submit it online through the IRS Form 3949-A Information Referral tool or print and mail it to Internal Revenue Service, PO Box 3801, Ogden, UT 84409 — there is no fax number and the IRS does not take referrals by phone. Section C (your own details) is optional, so you can report anonymously, and the IRS keeps your identity confidential either way. The current PDF is Form 3949-A (Rev. October 2020), free from irs.gov. With JustFill you upload that blank, the AI auto-detects every field and checkbox, you type or dictate your answers, and the first clean completed PDF download is included at no charge.
Suspect a business is paying workers under the table, or that someone is hiding income from the IRS? Form 3949-A, Information Referral, is how you report suspected violations of federal tax law by an individual or a business. Section A identifies who you are reporting, Section B describes the alleged violation — with checkboxes for common issues like unreported income, false deductions, failure to file, and failure to withhold tax — and Section C asks for your contact details, which you may leave blank to stay anonymous. It is not the right form for identity theft (Form 14039), tax-preparer misconduct (Forms 14157 and 14157-A), abusive tax schemes (Form 14242), tax-exempt organizations (Form 13909) or a whistleblower award claim (Form 211). The IRS now also offers an online version of the referral, but many people still prefer the PDF because they can draft it carefully and keep a copy. JustFill makes the official PDF fillable in your browser: the AI auto-detects every field and checkbox, you type or dictate your report, and the first clean completed PDF download is included at no charge.
The official Form 3949-A (Rev. October 2020) is a free three-page PDF from the IRS at irs.gov/pub/irs-pdf/f3949a.pdf — page 1 is the form, pages 2–3 are the instructions and the definitions of each violation box. It is already a fillable PDF, so there is nothing to buy: fill it in Acrobat Reader, or open the same blank in JustFill to type or dictate every field and checkbox in any browser; the first clean completed PDF download is included at no charge. Print and mail it to the Ogden address on page 1, or use the IRS online referral tool linked from irs.gov/forms-pubs/about-form-3949-a if you would rather not mail anything.
Get the official Form 3949-A PDF from IRSWhat each section of Form 3949-A asks for. JustFill’s AI will detect these fields automatically when you upload the PDF — review the breakdown below so you know what to enter.
Name, SSN or TIN, date of birth, street address, occupation, email address, marital status and spouse's name of the person you are reporting (items 1a–1k). The form says to leave blank any line you do not know.
Business name, employer identification number (EIN), telephone number, street address, email address and website, if known (items 2a–2i). Complete both item 1 and item 2 when you are reporting a business and its owner.
Sixteen checkboxes — check all that apply: False Exemption, False Deductions, Multiple Filings, Organized Crime, Unsubstantiated Income, Earned Income Credit, Public/Political Corruption, False/Altered Documents, Unreported Income, Narcotics Income, Kickback, Wagering/Gambling, Failure to Withhold Tax, Failure to File Return, Failure to Pay Tax, and Other (describe in item 5). Page 2 of the form defines each one.
Up to six tax years with the dollar amount of unreported income for each, if known, in the form's own format (its example: TY 2010 – $10,000).
A factual description of the violation: who, what, when, how you know, and where records or funds are located.
Whether books or records are available — do not send them now; the IRS will contact you if they are needed for an investigation — whether you consider the taxpayer dangerous, and the names and addresses of up to two banks or financial institutions they use. Answer only what you can; otherwise leave blank.
Your name, telephone number, best time to call and address. The form states this is not required to process your report and that the IRS never shares it with the person or business you are reporting; leave it blank to stay anonymous.
A fictional former employee reports a car-detailing business that paid its staff in cash with no withholding and no W-2s or 1099s. The reporter chooses to stay anonymous, so Section C is left blank.
Left blank
The report is about the business only; complete both 1 and 2 only when you are reporting a business and its owner.
EXAMPLE AUTO DETAILING LLC — EIN unknown, left blank
The form says to leave blank any lines you do not know; a missing EIN does not stop the report.
(555) 010-0199 — 300 Sample Road, Reno, NV 89501 — no email or website known
Give the address where the business actually operates so the IRS can identify it.
Failure to Withhold Tax; Unreported Income
Check every box that applies. The instructions define Failure to Withhold Tax as not withholding Social Security or Medicare taxes from employees, for example treating employees as contractors.
TY 2025 – $60,000 (estimate)
Use the form's own format (TY year – $ amount) and give your best estimate; leave blank if you have none.
From 03/2025 to 06/2026 I worked as a detailer at this shop. The owner paid all four workers in cash every Friday, issued no W-2 or 1099 forms, and kept customer cash payments in a separate box that was never rung up. I saw the weekly cash envelopes and the handwritten pay sheet.
Who, what, where, when and how you know — the facts the form asks for. Attach another sheet if you need more room.
6a Books/records available: Yes (not sent) — 6b Dangerous: No
The form says not to send records now; the IRS will contact you if they are needed for an investigation.
Example Community Bank, 1 Sample Plaza, Reno, NV 89501
Name and address of any financial institution the taxpayer uses, if known.
Left blank (anonymous)
The form says this is not required to process the report and is never shared with the person or business reported; give it only if you are willing to be contacted.
These values are made up. They are here to show what belongs on each line, not to be copied — every name, number, and address on your own Form 3949-A has to be your own.
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Official source: Form 3949-A on IRS’s website
Edition checked: Form 3949-A (Rev. October 2020), Catalog No. 47872E, OMB 1545-1960 — the PDF the IRS serves on 2026-09-02; the About page adds an online "Form 3949-A Information Referral" tool as a Recent Development. Verified against the official source on .
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