FBAR maximum account value finder

How the maximum value is worked out

1. Each statement line with a date and a balance is read; the highest balance of each day is kept. The balance held on January 1 (the last closing balance of the year before) counts too.
2. The highest of those in the calendar year is the account's maximum, in its own currency, with its date.
3. It is divided by the Treasury Reporting Rate of Exchange for December 31 of that year (foreign units per US dollar) and rounded up to the next whole dollar. Record all amounts as U.S. Dollar amounts rounded up to the next whole dollar. The amount $15,265.25 would be recorded as $15,266.
4. The maxima of all accounts are added. Over $10,000 means an FBAR is due for that year. If the value results in a negative (minus) value, enter zero (0) in item 15, Maximum account value.

Sample data: the sample current account peaks at 10,030.40 EUR on Aug 29, 2025; at the 2025 rate of 0.851 per dollar that is $11,787. With the sample GBP balance the aggregate is $15,004.

FinCEN: "The maximum value of an account is a reasonable approximation of the greatest value of currency or nonmonetary assets in the account during the calendar year. Periodic account statements may be relied on if they fairly reflect the maximum account value. Each account is valued separately." Filers with fewer than 25 accounts who cannot determine whether the aggregate maximum values exceeded $10,000 complete the account section for each account and check the "amount unknown" box, item 15a.

The FBAR is due April 15 following the calendar year reported, with an automatic extension to October 15; no request is needed. You file on FinCEN's BSA E-Filing System, free; individuals do not need to register. See the Treasury rates by year.

Where the rates and rules come from

Rates: the Treasury Reporting Rates of Exchange as of December 31, 2019-2025, read from the Treasury's Fiscal Data API on 2026-09-30. Rules: FinCEN's maximum value page, the FBAR line item instructions and the IRS FBAR page, each quoted with its date. Your statements stay in your browser.

Sources

• Exchange rates: U.S. Treasury, Bureau of the Fiscal Service: Treasury Reporting Rates of Exchange, as of December 31, 2019-2025, from the Fiscal Data API — https://api.fiscaldata.treasury.gov/services/api/fiscal_service/v1/accounting/od/rates_of_exchange?fields=record_date,country,currency,country_currency_desc,exchange_rate,effective_date&filter=record_date:in:%282019-12-31,2020-12-31,2021-12-31,2022-12-31,2023-12-31,2024-12-31,2025-12-31%29&sort=record_date,country_currency_desc&page%5Bsize%5D=10000 (dataset page https://fiscaldata.treasury.gov/datasets/treasury-reporting-rates-exchange/treasury-reporting-rates-of-exchange), read on 2026-09-30
• Filing threshold: FinCEN, Report Foreign Bank and Financial Accounts: "must file an FBAR if the aggregate value of the foreign financial accounts exceeds $10,000 at any time during the calendar year" — https://www.fincen.gov/report-foreign-bank-and-financial-accounts, read on 2026-09-30
• Maximum account value: FinCEN, Reporting Maximum Account Value, Step 1 — https://www.fincen.gov/reporting-maximum-account-value, read on 2026-09-30
• Currency conversion: FinCEN, Reporting Maximum Account Value, Step 2 — https://www.fincen.gov/reporting-maximum-account-value, read on 2026-09-30
• Currency without a Treasury rate: FinCEN, Reporting Maximum Account Value, Step 2 — https://www.fincen.gov/reporting-maximum-account-value, read on 2026-09-30
• Rounding: FinCEN, Reporting Maximum Account Value, Monetary amounts — https://www.fincen.gov/reporting-maximum-account-value, read on 2026-09-30
• Negative value: FinCEN, Reporting Maximum Account Value, Note — https://www.fincen.gov/reporting-maximum-account-value, read on 2026-09-30
• Amount unknown (15a): FinCEN, Reporting Maximum Account Value — https://www.fincen.gov/reporting-maximum-account-value, read on 2026-09-30
• Due date: IRS, Report of Foreign Bank and Financial Accounts (FBAR), When to file — https://www.irs.gov/businesses/small-businesses-self-employed/report-of-foreign-bank-and-financial-accounts-fbar, read on 2026-09-30
• How to file: IRS, Report of Foreign Bank and Financial Accounts (FBAR), How to file — https://www.irs.gov/businesses/small-businesses-self-employed/report-of-foreign-bank-and-financial-accounts-fbar; FinCEN — https://www.fincen.gov/report-foreign-bank-and-financial-accounts, read on 2026-09-30
• Records: IRS, Report of Foreign Bank and Financial Accounts (FBAR), Keeping records — https://www.irs.gov/businesses/small-businesses-self-employed/report-of-foreign-bank-and-financial-accounts-fbar, read on 2026-09-30
• Late FBARs: IRS, Report of Foreign Bank and Financial Accounts (FBAR), Filing delinquent FBARs — https://www.irs.gov/businesses/small-businesses-self-employed/report-of-foreign-bank-and-financial-accounts-fbar, read on 2026-09-30
• Account fields (Part II): FinCEN, BSA Electronic Filing Requirements for the FBAR (Line Item Filing Instructions), Part II Items 15-23 — https://www.fincen.gov/system/files/shared/FBAR%20Line%20Item%20Filing%20Instructions.pdf, read on 2026-09-30

Finds the highest balance in the statements you load and converts it at the Treasury Reporting Rate of Exchange for the year. Not tax or legal advice. You file the FBAR yourself, free, on FinCEN's BSA E-Filing System. Not affiliated with FinCEN, the IRS, the US Treasury or Wise.