The FBAR's record-keeping requirement is the least-discussed part of the regime and, in an examination, the part that decides how painful one is. The form itself asks for summary data; the records behind it — statements, maximum-value calculations, conversions — are what you must produce if the government comes asking, often five or more years after the filing felt like ancient history. Here is exactly what to keep and a system for keeping it with near-zero ongoing effort.
The legal requirement
Under 31 CFR 1010.430, a person required to file an FBAR must retain records for five years from the filing date containing, for each account:
- The name of the financial institution
- The address of the institution (or, for certain records, the account holder's records showing it)
- The type of account (checking, savings, brokerage, custodial, etc.)
- The account number or other identifying designation
- The maximum value of the account during the reporting period — and how it was determined
The requirement applies whether you filed as the account owner, jointly, or under signature authority.
The five-year clock, precisely
The retention period runs from the date of filing, not the calendar year being reported. So:
| FBAR filed | For calendar year | Records kept until |
|---|---|---|
| April 15, 2026 (or via auto-extension, Oct 15, 2026) | 2025 | At least April/October 2031 |
In practice, keep records indefinitely if you can afford the disk space — examinations of willful-adjacent cases reach further back than five years, and limitation questions for willful violations extend the government's reach.
What "maximum value documentation" means
The FBAR reports the maximum value each account reached during the calendar year, in US dollars. The records that support it:
- Statements sufficient to show the peak. Monthly statements cover most cases; for volatile brokerage accounts, the institution's own "highest balance" data or transaction history fills gaps.
- The exchange rate and the conversion. Treasury's yearly exchange rates are the default conversion source. If you used the rate on the day of the actual maximum balance (permitted for maximum-value reporting), keep that rate too.
- Joint-ownership notes. Who the co-owners were — needed because joint-account rules require full-value reporting with co-owner identification.
- Your e-filing confirmation. FinCEN emails a BSA Identifier on acceptance. It is your proof of timely filing — save it with the same rigor as the account records.
A five-minute annual system
The failure mode is not the requirement — it is trying to reconstruct 2021 statements in 2028. The fix is an annual habit, ideally during the January lull or right at FBAR season:
- Create a folder per year (
FBAR/2025/) in cloud storage. - Drop in: a PDF (or scan) of each account's highest-balance statement, a one-line note of the maximum value and the exchange rate used, and the e-filing confirmation when you file.
- One summary spreadsheet, one row per account: institution, country, type, number (last 4 is fine for your own copy), max value, joint-owner names.
- Done. The folder is your compliance file — for the FBAR and, incidentally, a gift to yourself when Form 8938 questions come up (see FBAR vs 8938).
If records are already gone
Reconstruct rather than despair. Order archive copies from the bank (institutions routinely produce statements or "balance confirmations" for closed periods), use transaction histories from online portals, and document your methodology for any estimated maximum (rate table + known balances bracketing the peak). A documented reconstruction answers an examiner; an undocumented assertion does not. And if the gaps coincide with late filings needing a reasonable cause statement, the reconstruction effort itself demonstrates good faith.
What examiners actually ask for
In a routine FBAR examination the first document request is predictable: the filed FBARs, the e-filing confirmations, statements for each reported account, and the source of any reported maximum values. Files organized per the system above answer the request in an afternoon. Files that require forensic archaeology invite deeper digging — the practical penalty of bad record-keeping is not the regulation's five-year rule, it's the shape of the examination that follows.
This page is general information, not tax or legal advice. See 31 CFR 1010.430 for the regulatory text and the IRS FBAR guide for the official summary.
Frequently asked questions
How long must I keep FBAR records?
Five years. The record-keeping requirement runs from the filing date of the FBAR, so a return filed April 15, 2026 for calendar year 2025 should be supported by records retained until at least April 2031.
What records does the FBAR require me to keep?
For each account reported: the name of the financial institution, its address, the type of account, the account number (or other identifier), and the maximum value of the account during the year — plus the basis for how the maximum value was calculated if it wasn't a simple year-end balance.
Do I have to send statements to the IRS with the FBAR?
No. The FBAR itself contains only summary information per account. The underlying records (statements, maximum-value documentation) must be retained and produced if the IRS or FinCEN asks — typically years after the original filing.
What happens if I can't find my old statements?
Banks generally retain records longer than five years and can issue balance confirmations or archive copies on request. Reconstructed maximum values with documented methodology (statement history, currency conversions on known dates) are far better than gaps. Never fabricate.
Are currency conversions part of the record-keeping duty?
Yes in practice: maximum values are reported in US dollars, converted at the Treasury's year-end exchange rate (or, for maximum value, the rate on the day of the highest balance under the regulations' alternative). Keep the rate source and conversion arithmetic with your records.