On this page
- What is IRS Form 3949-A?
- Is Form 3949-A the same as the IRS whistleblower form?
- What can you report on Form 3949-A?
- What information do you need to include?
- Can you file Form 3949-A anonymously?
- Where do you send Form 3949-A, and can you file it online?
- What happens after you file?
- What if the report involves your own business or past return?
- Frequently asked questions
- Your next step
IRS Form 3949-A: How to Report Suspected Tax Fraud (and What Happens Next)
IRS Form 3949-A, Information Referral, is the form you use to tell the IRS that you believe another person or business is not following the tax laws. It is a tip, not a claim for a reward, and the IRS does not report back on what it does with it.
Here's the short version of how it works, what to put on it, and when a different form is the better fit.
What is IRS Form 3949-A?
Form 3949-A is a one-page referral form for reporting suspected tax violations by someone else. It covers things like unreported income, false deductions, fake employment records, or a business that isn't paying its payroll taxes.
It is aimed at third-party reports only. If the problem is your own return, Form 3949-A is the wrong tool. Amending a return you got wrong is a different process, covered in our guide to Form 1040-X.
Is Form 3949-A the same as the IRS whistleblower form?
No. The whistleblower form is Form 211, Application for Award for Original Information, and it goes to the IRS Whistleblower Office. Searches for "irs whistleblower form 3949-a" mix the two up, which is understandable.
The difference matters in practice:
| | Form 3949-A | Form 211 |
|---|---|---|
| Purpose | Report suspected tax violations | Apply for a whistleblower award |
| Reward possible | No | Yes, if the case meets the program's requirements |
| Typical use | Tips from the public | Substantial, well-documented cases |
| Feedback from IRS | None on the outcome | Limited, through the Whistleblower Office |
The award program has dollar thresholds and eligibility rules that change, so check the IRS Whistleblower Office page before assuming a case qualifies. If you think you hold strong, documented evidence of a large underpayment, that is a conversation to have with a professional before you file anything.
What can you report on Form 3949-A?
The form is meant for violations of the tax laws you have reason to believe are happening. Common examples include:
- Income that isn't being reported, including cash business income
- Deductions or credits that look made up or inflated
- Payroll tax problems, such as an employer withholding tax from paychecks and not sending it in
- Workers treated as contractors, or paid off the books
- Fake or altered documents attached to a return
- A tax preparer who prepares false returns
Preparer misconduct has its own channel. For a return preparer, the IRS directs you to Form 14157, Complaint: Tax Return Preparer. Use 3949-A for general tax violations and 14157 when the person you're reporting is the preparer.
What information do you need to include?
The more specific you are, the more the IRS has to work with. The form asks for:
- The name and address of the person or business you're reporting, and their SSN or EIN if you know it
- A description of what you believe is wrong, including the tax years involved
- How you know about it and how the person is hiding or misreporting income
- Your own name, address, and phone number (optional, see below)
Stick to what you know firsthand and can explain. Opinions and rumors give the IRS nothing to act on. If you have documents that support the claim, say what they are. Don't take records you aren't entitled to have.
Can you file Form 3949-A anonymously?
Yes. You can leave your identifying information off the form. The tradeoff is that the IRS has no way to reach you if it has questions, which can make a thin tip less useful.
Also, the IRS has said it can't promise confidentiality in every circumstance. If you're worried about exposure, particularly when the person you're reporting is a former business partner or an ex-spouse, think that through before you sign.
Where do you send Form 3949-A, and can you file it online?
The form is a downloadable PDF on IRS.gov. The instructions on the form say to mail it to the Internal Revenue Service, Fresno, CA 93888. Print it, complete it, and mail it, or check the IRS page for any current alternative submission method before you send.
Confirm the address against the current version of the form on IRS.gov before mailing. Addresses and procedures can change, and the form itself is the authority.
What happens after you file?
Usually, you won't hear anything. The IRS reviews referrals to decide whether to investigate, and privacy law keeps it from sharing the results with the person who made the report. No news is not a sign it was ignored, and it is not a sign it was acted on.
The IRS also doesn't pay for tips on Form 3949-A, and filing one doesn't open a dispute on your own account. For a sense of how the agency picks cases for review, see what triggers an IRS audit for small business owners.
What if the report involves your own business or past return?
Sometimes the person who wants to report is tied up in the problem: a spouse's return you signed, a former employer's payroll practices, a partner's books. Those situations carry their own exposure, and they're worth talking through before you file.
If you're worried about an issue on your own account, IRS and state tax problem help is the place to start. And if you receive a notice that may stem from someone else's report or any other source, IRS audit representation for high earners explains what to expect and how to prepare.
On the other side of the coin, honest records protect you. Businesses that keep clean monthly bookkeeping, issue the right paperwork, and follow the rules on 1099s for contractors and payroll taxes are much less exposed to a tip that goes nowhere.
Frequently asked questions
Is IRS Form 3949-A confidential?
You can leave your name off the form, and the IRS generally doesn't disclose the source of a referral. It does not promise confidentiality in every situation, so weigh the risk before you include your details.
Does the IRS pay you for filing Form 3949-A?
No. Form 3949-A is a tip, not a reward claim. Awards are handled through Form 211 and the IRS Whistleblower Office, and only for cases that meet the program's requirements.
Will the IRS tell me what happened with my report?
Generally no. Taxpayer privacy rules keep the IRS from sharing the outcome of any investigation with the person who made the referral.
How is Form 3949-A different from Form 14157?
Form 14157 is for complaints about a tax return preparer. Form 3949-A covers general suspected tax violations by any person or business.
Where can I find the Form 3949-A PDF?
It is available as a free download on IRS.gov. Use the current version and follow the mailing instructions printed on it.
Your next step
If you're sitting on information about a possible violation, write down what you know firsthand, gather what you're legitimately entitled to keep, and decide whether 3949-A, 14157, or Form 211 matches the situation. If your own filings are tangled up in it, get advice before you send anything.
SBZ Tax can talk through your options. Book a free consultation, call 818-748-2020, or visit the office at 190 Sierra Ct Ste 335, Palmdale, CA 93550. You can also review pricing first.
This article is general information, not tax advice for your specific situation. Talk to a qualified tax professional before acting on it.
