I Haven't Filed US Taxes in Years. How Far Back Do I Go? Three Returns and Six FBARs Under Streamlined, or Six Years Outside It

The instinct of a US citizen who discovers twenty years of unfiled returns is to file twenty years of returns. That is neither required nor wise. The streamlined procedures define the lookback: the three most recent years for which the return due date has passed, plus six years of FBARs. Outside the streamlined program, the IRS's enforcement policy (Policy Statement 5-133) generally requires six years of delinquent returns to be considered compliant, though it can ask for more where the facts warrant. What remains true in the background is that an unfiled year never closes: the statute of limitations on assessment starts only when a return is filed. The program's value is that the IRS does not pursue the earlier years for a non-willful filer who has used it.

Key takeaways

• Streamlined: three years of returns (the most recent three for which the due date, including extensions, has passed) and six years of FBARs. Nothing earlier is filed.
• Outside streamlined (delinquent filing with reasonable cause): the IRS's general policy is that six years of delinquent returns satisfy the filing requirement for enforcement purposes; managers can require more where the facts (large unpaid tax, willfulness indicators) justify it.
• The statute of limitations: three years from filing for assessment; six years for a substantial omission (including omitted foreign income over $5,000); no limit for an unfiled year, or for a return that omits a required international information return (the statute stays open until the form is filed). The FBAR statute is six years from the due date.
• What "open forever" means in practice: the IRS can assess any unfiled year, but its resources and policy focus on recent years; a streamlined filer who is compliant going forward is rarely asked about year seven and beyond. It is not a guarantee.
• Refund years: a refund is available only for returns filed within three years of the due date; a non-filer with large withholding or credits in older years has lost them.
• Choosing: streamlined if eligible (non-willful, and the track's residency and filed-return conditions); delinquent filing with reasonable cause if not; the Voluntary Disclosure Practice if the conduct was willful (a six-year disclosure period, with accuracy-related and per-year FBAR penalties under its current terms).

The streamlined lookback

The covered tax return period is the three most recent years for which the return due date has passed. For a submission made in September 2026, that is 2023, 2024, and 2025 (the 2025 return was due April 15 or June 15, 2026, with extension to October 15, so if the taxpayer is on extension, 2025 may not yet be "past due" and the period is 2022 to 2024; the IRS's instruction is to include years whose due date including extensions has passed). The covered FBAR period is the six most recent years for which the FBAR due date has passed: 2020 through 2025. The submission includes only those years. Earlier years are not filed, not mentioned, and, for a non-willful filer who has used the program, not pursued in the IRS's practice.

The six-year policy

Outside the streamlined program, IRS Policy Statement 5-133 provides that enforcement of delinquency procedures will generally be limited to six years, and that a taxpayer who files six years of delinquent returns is considered compliant, unless the facts warrant going further (a large liability, indications of fraud, or a longer period specifically requested). A non-filer who cannot use streamlined (a US resident who never filed, for example) files six years of returns with a reasonable-cause statement and the six FBARs, and requests penalty abatement. The IRS may or may not grant it; the first-time abatement policy and reasonable cause are the arguments.

The statutes

• Assessment on a filed return: three years from the later of the due date and the filing date.
• Substantial omission: six years where the return omits more than 25% of gross income, or omits more than $5,000 of income from foreign financial assets that should have been reported on Form 8938.
• Unfiled return: no statute; the year stays open until a return is filed and the three years run from then.
• Missing international information return: the statute on the entire return stays open until the form (5471, 3520, 8938, 8621, 8865) is filed; then three years from that filing.
• FBAR: six years from the FBAR due date, regardless of filing.
• Refunds: three years from the return's due date (or two years from payment); older refunds are forfeited.

The practical consequence for a long-term non-filer: every unfiled year is open, but the IRS's own procedures direct it to the last three (streamlined) or six (delinquent), and the FBAR penalty exposure is capped at six years by statute.

What goes into the returns

Each return in the lookback must be complete: worldwide income (Canadian salary, pension, investment income converted to US dollars), the foreign tax credit on Form 1116 (which usually eliminates the tax on employment income), Form 8938, Form 3520 and 3520-A for a TFSA or RESP, Form 5471 for a Canadian corporation, Form 8621 for each Canadian mutual fund, Form 8833 for the RRSP treaty position where applicable, and Schedule B with the foreign account question answered "Yes." An incomplete return in the lookback leaves that year's statute open for the missing form.

Choosing the route

Streamlined (foreign or domestic): non-willful conduct; the residency test for the foreign track or filed returns for the domestic track; no open examination. Three returns, six FBARs, certification. No penalty (foreign) or 5% (domestic).

Delinquent filing with reasonable cause: available to anyone not under examination; six years of returns (or fewer if the IRS agrees) and six FBARs (the delinquent FBAR submission procedure applies only where all income was reported; otherwise the FBARs are filed with the returns and the penalty is argued). Penalties are assessed and abated on reasonable cause, with no guarantee.

Voluntary Disclosure Practice: willful conduct. Preclearance on Form 14457; a six-year disclosure period of returns and FBARs; under the practice's current published terms, failure-to-file penalties, a 20% accuracy-related penalty on each amended year, and per-year FBAR penalties adjusted for inflation (the IRS retains authority to assert the civil fraud penalty in egregious cases); protection from criminal referral.

Quiet disclosure (filing forward only, or filing old years without a program): not recommended; the IRS has stated that it may treat quiet disclosures as willful, and the old years remain open with no penalty protection.

Worked example

A US citizen who moved to Vancouver in 2004 and has never filed a US return or FBAR, with a BC home, an RRSP, a TFSA, Canadian mutual funds, and a Canadian salary, learns of the obligation in September 2026.

• Lookback. Streamlined foreign: returns for 2023, 2024, and 2025 (all three due dates have passed); FBARs for 2020 through 2025. Nothing for 2004 to 2019 or 2022.
• Returns. Each with Form 1116 (Canadian tax eliminates US tax on salary), Form 8938, Forms 3520 and 3520-A for the TFSA, Forms 8621 for each fund, Form 8833 for the RRSP, Schedule B.
• Tax. Near zero on salary after the credit; some US tax on the TFSA and PFIC income; interest.
• Penalties. None.
• The earlier years. Open in law; not filed; not pursued in practice for a non-willful streamlined filer who stays compliant. The FBAR exposure for 2004 to 2019 expired under the six-year statute.

Official sources

The IRS states that a US citizen or lawful permanent resident meets the non-residency requirement where, "in any one or more of the most recent three years for which the U.S. tax return due date (or properly applied for extended due date) has passed," the individual "did not have a U.S. abode and the individual was physically outside the United States for at least 330 full days." Eligible taxpayers "will not be subject to failure-to-file and failure-to-pay penalties, accuracy-related penalties, information return penalties, or FBAR penalties." — Internal Revenue Service, U.S. Taxpayers Residing Outside the United States, https://www.irs.gov/individuals/international-taxpayers/us-taxpayers-residing-outside-the-united-states

The IRS explains that the statute of limitations on assessment is generally three years from the date a return is filed, six years for a substantial omission of income including omitted foreign income above $5,000, and unlimited where no return is filed. — Internal Revenue Service, Statute of Limitations Processes and Procedures, https://www.irs.gov/irm/part25/irm_25-006-001r

Practitioner note

Twenty years of unfiled returns is a three-return, six-FBAR problem under streamlined, and a six-return problem outside it. The earlier years are open in theory and closed in practice for a non-willful filer who uses the program and stays compliant. We do not file more years than the program asks for, and we make every year we do file complete, because a missing form in a filed year is the thing that keeps that year open.

See also: If you are a US citizen or green card holder in Canada catching up, start with what you still owe the IRS, and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the lookback determination, the complete returns and FBARs for the covered years, and the certification or reasonable-cause statement. See cross-border pricing or book a call.