A tax affidavit is a sworn written statement, signed under penalty of perjury, that confirms a fact the IRS, a state tax agency, a county recorder, or another party needs for a tax-related purpose. You might sign one to prove you’re not a foreign person selling U.S. real estate, to report that someone filed a fraudulent return using your Social Security number, or to certify a sale price so a county can calculate transfer tax. The signature is what gives the document its weight: a false statement on a tax affidavit can trigger a civil fraud penalty of 75% of any resulting underpayment and, in the worst cases, a federal felony carrying up to three years in prison.1Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements
When You’ll Need to Sign One
Most people encounter a tax affidavit during a specific transaction, when someone with authority needs a fact in writing and wants your legal credibility behind it. The common situations fall into a handful of categories.
Real Estate Sales
Nearly every property sale produces at least one tax affidavit. Many states and counties require a real estate transfer tax affidavit (sometimes called an excise tax affidavit) that reports the sale price, the type of property, and whether an exemption applies. The county uses it to calculate the correct transfer tax before recording the deed. These state and local affidavits typically have to be notarized, and the exemption you claim can be audited later — Washington State, for instance, allows audits for up to four years after the sale or the filing date, whichever is later.2Washington Department of Revenue. Real Estate Excise Tax Exemptions (Commonly Used)
FIRPTA and Non-Foreign Status
When a foreign person sells U.S. real property, the buyer is generally required to withhold 15% of the total sale price and send it to the IRS.3Office of the Law Revision Counsel. 26 USC 1445 – Withholding of Tax on Dispositions of United States Real Property Interests If you’re a U.S. citizen or resident alien, you avoid that withholding by giving the buyer a non-foreign status affidavit, sometimes called a FIRPTA certificate or transferor’s certification. It has to include your name, U.S. taxpayer identification number, and home address, and you sign it under penalties of perjury.4Internal Revenue Service. Exceptions from FIRPTA Withholding The certification is void if the buyer has actual knowledge that it’s false. For homes the buyer is purchasing as a residence at a price under $1,000,000, the withholding rate drops to 10%.
The stakes here are tangible. Skip the affidavit and the buyer withholds tens of thousands of dollars from your proceeds at closing. A title company or closing attorney usually produces the form, but you’re the one swearing to the facts.
Identity Theft
If someone uses your Social Security number to file a fraudulent return, you report it to the IRS on Form 14039, the Identity Theft Affidavit.5Internal Revenue Service. Form 14039 – Identity Theft Affidavit Common triggers include an e-file rejection because a return was already filed under your SSN, a notice about wages from an employer you never worked for, or a tax transcript you didn’t request.6Internal Revenue Service. When to File an Identity Theft Affidavit You can file it online, mail it, fax it, or submit it through the Federal Trade Commission, which forwards it to the IRS. Don’t send duplicates while you wait; the IRS says duplicate copies actually slow the process down.7Internal Revenue Service. How IRS ID Theft Victim Assistance Works
Tax Preparer Misconduct
If a preparer altered your return, filed without your consent, or otherwise acted improperly, the IRS investigates using Form 14157-A, the Tax Return Preparer Fraud or Misconduct Affidavit.8Internal Revenue Service. Form 14157-A – Tax Return Preparer Fraud or Misconduct Affidavit You sign it under penalties of perjury, declaring the information you provide about the preparer’s conduct is true, correct, and complete.9Internal Revenue Service. Make a Complaint About a Tax Return Preparer
Donating Property Worth More Than $5,000
When you donate property worth more than $5,000 (other than publicly traded stock), the IRS requires Form 8283 attached to your return. Section B contains a Declaration of Appraiser, a sworn statement where the appraiser certifies their qualifications, affirms their fee wasn’t a percentage of the appraised value, and acknowledges that overstating value triggers penalties.10Internal Revenue Service. Form 8283 – Noncash Charitable Contributions The receiving organization also signs. You as the donor don’t sign a sworn statement here, but you rely on one, and an inflated appraisal puts both you and the appraiser at risk.
Small Estates
When someone dies with a modest estate, most states let heirs skip formal probate by filing a small estate affidavit. These typically require the affiant to swear that all of the deceased’s debts and taxes have been paid before any remaining assets are distributed. Dollar thresholds and specific requirements vary widely by state, so check your state’s probate code before assuming you qualify. Larger estates that owe federal estate tax use Form 706 instead, which is a return rather than an affidavit.
Notarized, or Just Signed Under Penalty of Perjury?
The common misconception is that every tax affidavit needs a notary stamp. Most federal tax documents don’t. Under federal tax law, returns, declarations, statements, and other required documents are verified by a written declaration that they are made under penalties of perjury, not by notarization.11Office of the Law Revision Counsel. 26 USC 6065 – Verification of Returns That’s why Form 14039, Form 14157-A, and most other IRS forms carry the perjury language above the signature line but have no notary block.
Notarization enters the picture at the state and local level. A real estate transfer tax affidavit filed with a county recorder almost always needs a notary. So do small estate affidavits filed in probate. The notary verifies your identity, witnesses your signature, and administers the oath. For affidavits, the notary performs a jurat, confirming you appeared in person, were identified through satisfactory evidence, and swore to the truth of the document before signing.12American Society of Notaries. Your Basic Duties As a Notary Public
Check the form itself. If it has a notary block, find a notary — banks, credit unions, UPS stores, and some public libraries offer the service. If it says “under penalties of perjury” with only a signature line, your signature alone creates the legal obligation.
What’s in the Document
Specifics vary, but most tax affidavits share the same bones:
- Your identifying information: full legal name, address, Social Security number or taxpayer identification number, and sometimes a phone number or email.
- The facts you’re swearing to: a sale price, a citizenship or residency status, a description of stolen identity, the value of donated property, or whatever else the form targets.
- A perjury declaration stating the information is true, correct, and complete. On IRS forms this language is standardized.
- Your signature and date. State and local versions add a notary block.
Some forms want supporting documents. Form 14039 asks for a copy of a government-issued ID. Form 8283 requires a qualified appraisal for high-value donations. Read the instructions for whatever form you’re using.
How to Prepare and File
Start by getting the right form. For IRS affidavits, download the current version from irs.gov; outdated versions get rejected. For real estate transfer tax affidavits, your county recorder, title company, or closing attorney will provide the correct version — using the wrong form in a real estate transaction can cause miscalculated tax and county rejection.13Washington Department of Revenue. Real Estate Excise Tax Forms
Pull your records before you fill anything in. Financial statements, property deeds, prior returns, identification — whatever the affidavit asks about, work from the source document. Errors on a sworn statement are disproportionately painful to fix.
Review the completed form carefully. Sign it, or take it to a notary if the form has a notary block. Then file with whoever requires it: the IRS, your county recorder, a title company, or whichever party initiated the request. IRS submissions go to the mailing or fax address in the form’s instructions. Real estate affidavits usually travel with the deed in the recording package.
Keep a copy. The IRS recommends retaining tax documents for at least three years after filing, and longer in specific situations. Keep records seven years if you file a claim for a loss from worthless securities or a bad debt, six years if you failed to report more than 25% of your gross income, and indefinitely if you never filed a return or filed a fraudulent one.14Internal Revenue Service. How Long Should I Keep Records
What a False Statement Costs
The perjury declaration isn’t a formality. On the criminal side, anyone who willfully makes a false statement on a document signed under penalties of perjury in connection with a tax matter commits a felony punishable by a fine of up to $100,000 ($500,000 for a corporation) and up to three years in prison.1Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements Prosecutors don’t need to prove the false statement caused a specific tax loss. Signing the false sworn document is the crime.
On the civil side, if a false statement produces an underpayment, the IRS can impose a fraud penalty equal to 75% of the portion of the underpayment attributable to fraud.15Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty That penalty stacks on top of the tax owed, plus interest. The IRS has to prove fraud by clear and convincing evidence, but once it clears that bar the arithmetic turns punishing.
FIRPTA affidavits carry an extra wrinkle. A false non-foreign status certification exposes you to perjury charges and can also make the buyer liable for the 15% withholding they relied on your affidavit to skip, which tends to produce lawsuits.16Internal Revenue Service. FIRPTA Withholding These forms carry weight precisely because the penalty for lying is designed to make the sworn statement credible.