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Form 3949-A is used to report suspected tax fraud or tax law violations to the IRS. This form allows individuals to provide information about a person or business they believe is not complying with federal tax laws, including underreporting income, filing false returns, or operating an illegal business.
Section A: Enter the name, address, Social Security number or EIN (if known), and date of birth of the person/business you are reporting.
Describe their occupation and the type of business.
Section B: Check the boxes indicating the type of violation: false exemptions, false deductions, unreported income, organized crime, failure to file, etc.
Estimate the amount of unreported income or false claims (if known).
Provide details about how you know about the violation (e.g., employee, business partner, customer).
Section C: Optionally provide your own name and contact information — you may file anonymously.
Describe the facts supporting your allegation in as much detail as possible.
Mail the completed form to the IRS (address listed on the form instructions).
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Yes. You are not required to provide your name or contact information on Form 3949-A. However, providing your identity allows the IRS to contact you for additional information, which may strengthen the investigation.
Form 3949-A does not provide a reward. If you want to be eligible for a financial reward (15-30% of collected proceeds over $2 million), you need to file Form 211 with the IRS Whistleblower Office instead.
No. Due to taxpayer confidentiality laws (IRC Section 6103), the IRS cannot disclose whether they took action on your referral or what the outcome was.
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