For the FBAR, the exchange rate to use is the Treasury Reporting Rate of Exchange in effect on December 31 of the year you’re reporting, published by the Bureau of the Fiscal Service.1Financial Crimes Enforcement Network. Reporting Maximum Account Value Not your bank’s rate, not the rate on the day your balance peaked, and not a figure pulled from a search engine. FinCEN Form 114 expects one specific government number, and using anything else without a good reason can turn a routine filing into a problem.
Where the Treasury Rate Lives
The FinCEN Form 114 instructions point filers to the Treasury’s Financial Management Service rate for each currency.2Financial Crimes Enforcement Network. BSA Electronic Filing Requirements for Report of Foreign Bank and Financial Accounts (FinCEN Form 114) Those rates are now hosted at fiscaldata.treasury.gov under the dataset called Treasury Reporting Rates of Exchange.3U.S. Treasury Fiscal Data. Treasury Reporting Rates of Exchange The dataset covers dozens of currencies and updates quarterly, and the December 31 figures are typically posted by mid-March of the following year. If you file every year, bookmark it.
Why December 31 Is the Date
Your peak balance can come from any point in the year, but the conversion always uses the December 31 rate.1Financial Crimes Enforcement Network. Reporting Maximum Account Value If a British account hit £50,000 in March, you still multiply £50,000 by the December 31 pound-to-dollar rate. The rule sits in the Form 114 filing instructions and applies to every account on the report.2Financial Crimes Enforcement Network. BSA Electronic Filing Requirements for Report of Foreign Bank and Financial Accounts (FinCEN Form 114)
That surprises people whose accounts were closed mid-year. If you shut a foreign account in June, you still use the December 31 Treasury rate, not the rate on the day you closed it. For countries with more than one official rate, use whichever rate would apply if you converted the balance to dollars on December 31.1Financial Crimes Enforcement Network. Reporting Maximum Account Value
If Your Currency Isn’t on the Treasury List
The Treasury dataset does not cover every currency. When yours isn’t there, the filing instructions permit “another verifiable exchange rate,” provided you note the source.2Financial Crimes Enforcement Network. BSA Electronic Filing Requirements for Report of Foreign Bank and Financial Accounts (FinCEN Form 114) Oanda, XE, and the Wall Street Journal’s currency data are commonly used in practice.
The operative word is “verifiable.” Whatever source you use, save a screenshot or printout showing the December 31 rate for the reporting year. Stick with the same source year to year when you can, so your filings line up.
How To Do the Conversion
Take the highest balance the account held at any point during the year in its local currency, and multiply it by the December 31 Treasury rate for that currency. That dollar figure is what goes on FinCEN Form 114.
One detail trips filers up: FBAR amounts round up to the next whole dollar, not to the nearest dollar. FinCEN’s instructions are explicit that $15,265.25 becomes $15,266, not $15,265.1Financial Crimes Enforcement Network. Reporting Maximum Account Value Every fraction rounds up. That matters most near the $10,000 aggregate threshold that triggers the filing requirement, which kicks in if the total of your highest foreign account balances exceeds $10,000 at any point in the year.4Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)
Don’t Confuse the FBAR Rate With Income Tax Conversions
If you also file Form 8938 under FATCA, that form uses a year-end exchange rate too.5Internal Revenue Service. Comparison of Form 8938 and FBAR Requirements The two forms overlap in coverage but go to different agencies: the FBAR to FinCEN through the BSA E-Filing System, Form 8938 to the IRS with your federal tax return.
For income tax purposes more broadly, the IRS has no single official rate and accepts any posted rate used consistently.6Internal Revenue Service. Yearly Average Currency Exchange Rates That flexibility does not apply to the FBAR. Don’t reach for the IRS yearly average rates on Form 114.
Keep the Rate You Used
Federal regulations require FBAR records for five years from the filing due date.7eCFR. 31 CFR 1010.430 – Nature of Records and Retention Period That covers the foreign account statements showing your peak balance, the Treasury rate you applied, and any documentation of an alternative rate for a currency not on the Treasury list. Five years is the floor; keeping the file a bit longer is cheap insurance.
What Getting the Rate Wrong Can Cost
FBAR penalties fall into two tiers. A non-willful violation carries a statutory maximum of $10,000 per account per year. A willful violation runs to the greater of $100,000 or 50 percent of the account balance at the time of the violation.8Office of the Law Revision Counsel. 31 USC 5321 – Civil Penalties Both figures are adjusted for inflation each year, and as of the January 2025 adjustment the non-willful cap had risen to roughly $16,500 and the willful floor to $165,353 per violation.9Federal Register. Inflation Adjustment of Civil Monetary Penalties
There is a safety valve: no penalty applies to a non-willful violation if the failure was due to reasonable cause and you properly reported all income from the account on your tax return.8Office of the Law Revision Counsel. 31 USC 5321 – Civil Penalties Reasonable cause won’t rescue a willful failure, and courts have read “willful” broadly enough to include reckless disregard, not only intentional evasion. Using the wrong exchange rate once won’t by itself produce a penalty. A pattern of sloppy conversions that consistently understates your foreign holdings is a different story.