Filing FBAR for the First Time: What You Need Before You Start

Filing FBAR for the first time means one electronic form, FinCEN Form 114, filed with the Treasury rather than the IRS, because your non-US accounts together topped $10,000 at some point in the calendar year. Nothing on the form is difficult. The work sits in what you gather before you open it: every account, every peak balance, and the details of each institution.

Most people who reach this point have just learned that an ordinary UK current account, a cash ISA and a workplace pension can add up to a US reporting obligation they had never heard of. This guide covers what the form asks for, how the numbers are worked out, and the decision first-time filers should make deliberately: what to do about earlier years.

Who has to file an FBAR, and when does the $10,000 threshold bite?

A United States person must file an FBAR if the aggregate value of their foreign financial accounts exceeded $10,000 at any time during the calendar year, according to FinCEN. Three words in that sentence do the damage. Aggregate means all accounts added together, so five accounts of $3,000 each cross the line. Any time means one day is enough, so a house deposit that passed through your account in March counts even if the balance fell back the following week. Foreign means outside the United States, which for an American living in Britain is nearly every account they hold.

A United States person includes US citizens, US residents, and entities and trusts formed under US law. FinCEN's instructions treat minor children as US persons too. Dual nationals and people who have never lived in the US are not carved out: an accidental American who has banked in Manchester their whole life sits inside the rule in exactly the same way as a New Yorker who moved to London last year.

The obligation also reaches accounts that are not yours. You file if you have a financial interest in an account, which covers accounts you own or hold legal title to, and separately if you have signature authority, which FinCEN defines as the authority to control the disposition of assets in the account by direct communication with the institution that maintains it. An employer account you can move money from, or an elderly parent's account you were added to, is reportable even though none of the money is yours.

Filing FBAR for the first time: what to gather before you open the form

Every first FBAR goes faster if you collect six things first. These are not sent to FinCEN as attachments; they are what the form asks you to type in.

1. Your identifying details. Name, date of birth, address, and your US taxpayer identification number, normally your Social Security number or ITIN. If you have no US TIN at all, FinCEN's instructions direct you to Item 4 instead, where you give a passport, foreign TIN or other official foreign document, its number and the country that issued it.
2. A complete list of accounts. Current accounts, savings accounts, building society accounts, ISAs, investment and brokerage accounts, and pensions where you have an account-like interest. Include accounts you closed during the year and accounts you hold jointly.
3. The institution's full name and address for each account, as it appears on your statements.
4. The account number or other designation for each account.
5. The maximum value of each account during the year, in the account's own currency, before conversion.
6. Whether each account is owned solely, held jointly, or covered only by signature authority, plus the co-owner's details for joint accounts.

One practical tip: pull twelve months of statements for every account in a single sitting. The peak balance is rarely where people expect it, and hunting for it twice is the part of the job everyone underestimates. Our filing FBAR and foreign income service works from exactly this pack of statements, which is why we ask for it up front.

Which UK accounts count as foreign financial accounts?

More than most first-time filers assume. FinCEN's definition of a financial account covers securities, brokerage, savings, demand, checking, deposit and time deposit accounts, and goes on to include commodity futures or options accounts, an insurance policy with a cash value, an annuity policy with a cash value, and shares in a mutual fund or similar pooled fund. A foreign financial account is simply one located outside the United States.

Two rules catch people out, and they point in opposite directions. An account at a branch of a US bank located outside the United States is reportable. An account at a US branch of a foreign bank is not. The location of the branch decides it, not the name over the door.

Pensions deserve caution rather than a rule of thumb. The exceptions in FinCEN's instructions are for US retirement arrangements, and no equivalent carve-out exists for a UK workplace scheme or a SIPP. Where you have an identifiable account balance, the cautious and common approach is to report it. How those pensions are then taxed is a separate question, covered in our guide to UK pensions and the US/UK tax treaty.

How do you work out the maximum value of each account?

FinCEN defines the maximum value as a reasonable approximation of the greatest value of currency or non-monetary assets in the account during the calendar year, and says periodic account statements may be relied on provided they fairly reflect that maximum. You are not expected to reconstruct daily balances. The highest figure shown across the year's statements is an acceptable basis.

The conversion step is the one part with a fixed rule. Convert each account's maximum value using the Treasury's published exchange rate for the last day of the calendar year being reported, not the rate on the day the balance peaked. Current and historical rates are published by the Bureau of the Fiscal Service. If no Treasury rate is available for a currency, another verifiable rate may be used as long as you give its source. Amounts are recorded in whole US dollars, rounded up.

Illustrative example: an American in Leeds holds a current account that peaked at £4,200, a cash ISA that peaked at £9,000, and a workplace pension that reached £11,500 during the year. Each is converted separately at the Treasury rate for December 31 of that year and then added together. The total clears $10,000 comfortably, so all three accounts are reported, even though no single account ever held $10,000 on its own.

Two edge cases have their own answers in the instructions. If an account's value works out negative, you enter zero. If you have fewer than 25 accounts and genuinely cannot tell whether the total passed $10,000, you complete the account details and check the amount unknown box rather than inventing a number. Filers with 25 or more accounts report the number of accounts instead of each one, but must keep the full details for FinCEN or the IRS.

What are the FBAR deadlines, and what happens if you miss them?

The FBAR is an annual report covering the calendar year, due April 15 of the following year. FinCEN grants filers who miss that date an automatic extension to October 15 each year, and specific requests for the extension are not required. There is no form to file for it and nothing to tell FinCEN. The 2025 calendar-year FBAR, for example, was due April 15, 2026 and runs to October 15, 2026 under that automatic extension.

That extension is why a surprising number of first FBARs are filed in early October. It is also why the FBAR and the tax return drift apart in people's minds: they share an October 15 date in most years, but the FBAR keeps its own timetable. The IRS is explicit that you do not file the FBAR with your federal tax return.

Penalties exist and they are not small, but they are aimed at concealment rather than at people who come forward. The IRS sets out civil penalties of up to $10,000 for a non-willful violation, and for a willful violation the greater of $100,000 or 50 percent of account balances, with the maximums adjusted annually for inflation. For someone filing late and voluntarily with all income reported, the practical exposure is usually far below those headline figures.

Filing your first FBAR: the BSA E-Filing System step by step

The form itself takes most people under an hour once the account list is ready.

1. Go to FinCEN's BSA E-Filing System. Individuals can file the FBAR without registering for a BSA E-Filing account. Registration is for professionals and institutions filing on behalf of others.
2. Choose the calendar year you are reporting. Each year is a separate report.
3. Enter your filer details, including your SSN or ITIN, or the foreign identification document if you have no US TIN.
4. Add each account, splitting them between accounts you own separately, accounts held jointly, and accounts over which you only have signature authority. Enter each maximum value in whole US dollars.
5. Sign electronically and submit. You receive an acknowledgement with a BSA identifier. Keep it.
6. If you are filing a late report, the form asks why it is late and offers a list of reasons. Answer it honestly rather than leaving it blank.

Keep the acknowledgement and a copy of the filed report. FinCEN requires filers to retain, for five years from April 15 of the year following the year reported, the name in which each account is maintained, the account number, the name and address of the institution, the type of account and its maximum value. Retaining a copy of the filed FBAR helps satisfy that requirement.

What first-time filers most often get wrong

The single biggest mistake is filing the current year alone and treating the matter as closed. The FBAR is an annual obligation, and if it applied this year there is a good chance it applied last year too. Filing one report does not fix the earlier ones.

The right route back depends on what your tax returns said:

• Returns filed, all foreign income reported, only the FBARs missing. The IRS tells taxpayers it has not contacted about a late FBAR to file late FBARs as soon as possible to keep potential penalties to a minimum, giving the reason for filing late on the form itself.
• Income was also unreported, or returns were never filed. The Streamlined Foreign Offshore Procedures are normally the route for people living abroad: three years of returns, six years of FBARs and a Form 14653 certification that the failure was non-willful. Our guide to the Streamlined Procedures walks through what qualifies.

Both routes close once the IRS contacts you first, which is the real cost of waiting. Three smaller errors are worth naming: halving a joint account instead of reporting it in full; leaving out an account that was closed mid-year; and assuming the FBAR covers your whole reporting duty. It does not. Form 8938 is a separate IRS form with much higher thresholds, starting at $200,000 of specified foreign financial assets on the last day of the tax year for a single filer living abroad, and many people file both. The differences are set out in our comparison of the FBAR and Form 8938, and the IRS publishes its own comparison of the two sets of requirements.

Spouses, children and joint accounts

Joint accounts are reported in full by each US person who holds them. Half of a joint balance is never the right answer, and a non-US spouse's lack of any US obligation does not reduce what the American spouse reports.

Where both spouses are US persons, one FBAR can cover both, but only if three conditions are met: every account the non-filing spouse would report is jointly owned with the filing spouse; the filing spouse reports those accounts on a timely filed, electronically signed FBAR; and both have completed and signed Form 114a, which is kept with your records and not sent to FinCEN. Miss any one of them and both spouses file separately, each reporting the full value of the joint accounts.

Children are treated as US persons in their own right. A child with a UK account in their own name can have their own filing requirement, and where the child cannot file or sign, a parent or guardian does it for them.

When is this a job for an adviser?

A straightforward first FBAR, with a handful of UK bank accounts and clean statements, is a form you can complete yourself. Outside help earns its fee at one of these points: several missed years; a stocks and shares ISA or UK funds that bring PFIC reporting into the return alongside the FBAR; a pension or trust interest where the reportable value is not obvious; or a first FBAR that arrives alongside a first US tax return after years abroad.

US/UK Cross Border Tax is a team of US CPAs and UK tax advisers working as one team, in London, Manchester, New York and San Francisco. We prepare FBARs alongside the US return so the accounts, the income and the forms agree with each other, and we handle catch-up filings where earlier years are open. If you are not sure which of your accounts are reportable, or how far back the problem goes, talk to us before you file.

The bottom line

Filing FBAR for the first time is a records exercise, not a tax calculation. Get the account list complete, find each account's peak balance, convert at the Treasury's year-end rate, and file by October 15 under the automatic extension. Then deal with prior years deliberately. For the wider picture of what else falls due each year, start with our guide for Americans in the UK.