Six Years to Prosecute: The Criminal Statute of Limitations for Not Filing

People who have not filed for a long time eventually ask a pointed question: is there a point after which they cannot be prosecuted for the old years? The answer is yes, there is a criminal statute of limitations. But it is easy to misread, and it does nothing to the civil side of the case.

The statute

IRC 6531 governs the periods of limitation on criminal prosecutions under the internal revenue laws. Its general rule is three years: no person shall be prosecuted "unless the indictment is found or the information instituted within 3 years next after the commission of the offense."

Then come the exceptions, where the period is six years. The ones that matter most to non-filers are:

So for willful failure to file under IRC 7203, the government generally has six years after the offense is committed to bring charges.

When the clock starts

The limitations period runs from "the commission of the offense." The offense in section 7203 is willfully failing to make a return "at the time or times required by law or regulations." In the ordinary case, that points to the date the return was due.

The last sentence of IRC 6531 adds that the rules of section 6513 apply in determining the periods of limitation on criminal prosecutions. Section 6513 contains rules about when returns are deemed filed and when tax is deemed paid. How those rules, and any extension of time to file, affect the start date in a particular case is a question for counsel looking at the specific facts.

What stops the clock

IRC 6531 contains two important extensions.

Absence or fugitive status. "The time during which the person committing any of the various offenses arising under the internal revenue laws is outside the United States or is a fugitive from justice... shall not be taken as any part of the time limited by law." For people who lived abroad during or after the unfiled years, this can extend exposure significantly.

Complaints. Where a complaint is instituted before a "commissioner of the United States" within the limitations period, the statute says "the time shall be extended until the date which is 9 months after the date of the making of the complaint." The wording dates from 1954, so how it applies today is a question for counsel.

Why six years for non-filing does not mean much on its own

It is tempting to look at the six-year number and conclude that anything older is safe. That is too simple, for several reasons.

Each year is a separate offense. A person who has not filed for twelve years has twelve separate failure-to-file offenses, each with its own six-year clock. The most recent years are always inside the window.

Evasion is a different offense. Under IRC 7201, the crime is a willful attempt to evade or defeat tax. The IRS's own handbook says willful failure to file may be elevated to a felony "where an overt act of evasion occurred" (IRM 25.1.7.1.2). Acts of evasion, such as concealing assets or lying to the IRS, can happen long after the original due date. The limitations analysis for evasion depends on those acts, not just on the due date.

False statements are new offenses. A false late return filed today, or a false statement made to an IRS employee today, starts its own period. Trying to cover old years with new lies is how old problems become new charges.

The six-year coincidence. Some people notice that the IRS's civil enforcement policy normally covers six years, and that the criminal period for failure to file is also six years. The two are separate. Policy Statement 5-133 is an administrative policy for civil enforcement that managers can expand. IRC 6531 is a statute about prosecution. Do not plan around one using the other.

Each year, one at a time

Picture a hypothetical taxpayer who stopped filing in 2014 and has not filed since. As of October 2026, the failure-to-file offenses for the earliest of those years may be outside the six-year period, assuming the taxpayer stayed in the United States and nothing else extended the time. The most recent six years are not. And if the taxpayer told an IRS employee last month that there was "no income" in years when there plainly was, that statement raises its own issues with its own timeline.

That is why lawyers do not answer the question "am I past the statute?" with a single yes or no. The answer is a year-by-year table, adjusted for travel abroad, for any complaint filed, and for any later conduct that could be charged as a separate offense.

Relationship to civil fraud penalties

The criminal limitations period does not limit civil fraud penalties either. The fraudulent failure-to-file penalty under IRC 6651(f) is a civil addition to tax, and the assessment period for a year with no return is open under IRC 6501(c)(3). A year can be beyond the reach of prosecution and still be subject to civil fraud penalties if the IRS can prove fraud by clear and convincing evidence. See the fraudulent failure-to-file penalty.

The civil side does not care

None of this affects civil liability. Under IRC 6501(c)(3), when no return is filed, the IRS may assess the tax at any time. A substitute for return does not start the civil clock either, under IRC 6501(b)(3). The IRS's normal civil enforcement focuses on six years under Policy Statement 5-133, but that can be extended with managerial approval.

So even when old years are outside the criminal window, they can still produce tax, penalties, and interest. See why there is no clock on a year you never filed.

How this fits into a filing strategy

For most non-filers, criminal exposure is not the main concern, and the right plan is simple: file accurate returns for the years the IRS normally enforces and resolve the balance. For a smaller group, where fraud indicators exist, the limitations analysis is part of a larger legal strategy that decides which years to address, in what order, and how.

That strategy should never involve waiting quietly for clocks to run while continuing not to file. Every new year of non-filing is a new offense with a new six-year period. The only way to stop adding years is to start filing.

A note on payment

IRC 6531(4) also covers willfully failing to pay tax at the time required. Filing a return you cannot pay is not a crime, and it is far better than not filing. But a person with the ability to pay who deliberately moves money out of reach while a balance is outstanding is creating a different set of facts. Keep payment decisions transparent and documented, and get advice before making large transfers while you have unresolved tax years.

What to do

• List every unfiled year and its due date.
• Note any years you lived outside the United States.
• Note every IRS contact and anything you said or sent in response.
• Do not make new statements to the IRS about old years without advice.
• File the current year on time, whatever else is going on.
• If any fraud indicators are present, talk to a tax attorney before filing back years.