How many years can you file back taxes?
Febb Borje, a tax professional with 12 years of expat tax experience, specializes in US tax preparation, tax planning, and tax advice for US citizens and Green Card holders living and working in Australia.
*30-minutes US$347.
Table of Contents
How many years can you file back taxes? The quick answer for expats
The IRS lets you file back taxes for any year, but to be considered compliant, expats are usually asked to file the last six years of returns. That simple rule covers most people asking, “how many years can I file back US taxes?”
The IRS lookback rules: compliance vs refunds vs audits vs collections
What does the IRS usually want when you catch up? In most delinquent cases, file the last six tax years and you are considered compliant.
The IRS Streamlined Foreign Offshore program lets US expats catch up by filing the most recent delinquent 3 years of tax returns, and the 6 most recent years of delinquent FBARs with a non-willful statement.
How long do you have to claim money back?
Generally, 3 years from the original due date of the return, or 2 years from the date you paid the tax, whichever is later. File later than that and you can still fix your history, but the refund is usually gone.
How far back can the IRS examine a filed return?
- Usually 3 years from when you filed.
- 6 years if there is a substantial omission of income.
- No limit if there is fraud or if a required return was never filed.
How long can the IRS collect after it assesses tax?
Typically 10 years from the assessment date. Certain actions can pause this clock, but ten years is the general rule.
Do you actually need to file?
Usually, yes. A zero US balance doesn’t mean you don’t have this responsibility. If you have self-employment income of US$400 or more, you generally need to file.
Investment income like interest, dividends, capital gains, or crypto sales can trigger a filing too. If you want Child Tax Credit or Additional Child Tax Credit, you still file to claim them. Paid by a foreign employer? Those wages are still reportable on your US return.
Quick self-check before you start
- Any gig, freelance, or consulting income this year or prior years? That US$400 threshold matters.
- Bank interest, dividends, ETFs, rental income, or capital gains? Put them on your list.
- Foreign employer with no US forms? Use payslips and year-end statements to report the wages.
Bring your tax filings current with help from our experts.
How to file back taxes from overseas: a step-by-step plan
- Pull the data you’ll need.
Get IRS wage and income transcripts if you can. Gather payslips, summaries, bank interest and dividend statements, managed fund distributions, and any sale documents for shares or property. Pick a consistent exchange-rate source and stick with it across all years. - Choose your approach for each year.
Prepare prior-year Form 1040s in order. Decide whether FEIE or the Foreign Tax Credit is smarter for each year based on your income mix and tax paid. If using FEIE, make sure your travel dates support the Physical Presence or Bona Fide Residence tests. If using the credit, separate passive and general categories and track carryovers. - Align your information reports.
If your foreign accounts crossed the thresholds, file FBAR for each relevant year and add Form 8938 to your return when required. Use the same institution names and countries across all forms. Match account numbers, highest balances, and year-end balances so the story is consistent. - Pick your path.
- Standard filing: good if you’re only a year or two behind.
- Streamlined Foreign Offshore: usually 3 years of returns and 6 FBARs plus a non-willful statement. It’s aimed at expats who lived abroad and simply fell behind.
- Reasonable cause: for edge cases where Streamlined doesn’t fit but you can document why you were late.
- Avoid easy mistakes.
- FEIE dates that don’t match your actual days outside the US.
- Reporting accounts on FBAR but forgetting the same accounts on Form 8938, or the reverse.
- Double-dipping by taking FEIE and also claiming the same foreign taxes for the credit on that income.
- Leaving out dividends or managed-fund distributions that show up on statements.
- File, pay, and document.
E-file where possible; otherwise, use tracked mail. Save PDFs of each return, payment, and mailing receipt. Keep a one-page index per year with the exchange rate you used and the forms you filed. - Set yourself up so you don’t fall behind again.
Turn on calendar reminders for FBAR and tax deadlines, download statements monthly, and keep a single folder for all tax documents. If you haven’t filed US taxes in years, what to do is start with the most recent six, protect any open refund years inside the three-year window, and keep everything consistent across returns and information reports.
Penalties and interest: what to expect and how to reduce them
There are two main penalties. Failure-to-file is usually the bigger one and ramps up the longer a return sits unfiled. Failure-to-pay is smaller per month but keeps ticking on any unpaid balance.
The fastest win is to file the return now, even if you can’t pay in full. Filing stops the larger penalty, and any payment you make today cuts the balance that interest is growing on.
This is because interest starts from the original due date and compounds daily until the tax is paid. The rate shifts a few times a year. You can’t erase interest with a request, so the practical move is to reduce the balance as soon as you can.
Can penalties be removed?
Sometimes. If you have a clean track record, first-time abatement may wipe one year’s penalties. Reasonable cause can work if you have documented circumstances like serious illness, inaccessible records, or a natural disaster. If you qualify for the Streamlined Foreign Offshore route, you’ll usually file 3 years of returns and 6 FBARs with a non-willful statement. When you qualify, that path often avoids the heavier penalties that apply in domestic cases.
Why does acting before the IRS contacts you help?
It shows good faith. Voluntary filings with a payment plan are more likely to get a softer response than waiting for notices. If you’re wondering, how many years can you file back taxes, remember you can file any year, but getting moving now usually means fewer penalties and less interest overall.
FAQ'S
Can I e-file old US returns from overseas, or do I have to mail them?
You can usually e-file only the most recent prior years supported by tax software; older years must be printed and mailed to the IRS with tracking.
If I’m due a refund, will I still get late-filing penalties?
Do I also need to file state tax returns if I live abroad?
Can I use the IRS Streamlined Foreign Offshore Procedures if the IRS already contacted me?
Can I switch between the Foreign Earned Income Exclusion (FEIE) and Foreign Tax Credit (FTC) when catching up?
