Sharing a bank account overseas with another person pulls you into a web of US tax and disclosure rules that applies whether or not you ever bring the money home. The international joint bank account tax rules require you to pay US income tax on your share of every dollar the account earns, file an FBAR once your foreign accounts combined cross $10,000 at any point in the year, file Form 8938 at higher thresholds, and potentially file gift or foreign-gift reports when money moves between you and your co-holder. The penalties for missing any of these can quickly exceed what sits in the account.
How the Account Is Titled Changes Everything
Before the tax questions make sense, the ownership structure has to be clear. Most foreign joint accounts fall into one of two forms, and the difference drives when gift tax applies, how much lands in a deceased co-holder’s estate, and what records you need to keep.
A joint tenancy with right of survivorship gives each holder an undivided interest in the full balance. When one holder dies, the survivor automatically takes the whole account without probate. This is the default at most banks, though the foreign country’s local law may use different terminology or alter how survivorship works.
A tenancy in common assigns each holder a defined percentage, presumed equal unless the account agreement says otherwise. A deceased holder’s share passes through their estate, not to the surviving co-holder. That distinction matters for gift tax too: a deposit into a tenancy-in-common account that exceeds your ownership share is treated as an immediate gift, not a potential future one.
Separate from ownership is signatory authority, which is simply the power to tell the bank to move money. You can have signatory authority without owning a cent. For FBAR purposes, that distinction doesn’t rescue you. Either ownership or signatory authority triggers the filing requirement.
FBAR: The $10,000 Threshold
If the combined value of all your foreign financial accounts tops $10,000 at any point in the calendar year, you must file FinCEN Form 114, known as the FBAR.1Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) The threshold measures aggregate value across every foreign account you own or control, not the joint account in isolation. So if you have $6,000 in a joint account in the UK and $5,000 in a personal account in Canada, you have crossed the line.
The form is filed electronically through FinCEN’s BSA E-Filing System, not with your tax return. The deadline is April 15, with an automatic extension to October 15 that requires no separate request.1Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) You report the maximum value the account held at any point during the year, converted to US dollars.
Spouses who jointly own the account get a shortcut. One spouse can file a single FBAR covering both parties, provided both complete and sign Form 114a, Record of Authorization to Electronically File FBARs.2Financial Crimes Enforcement Network. Reporting Jointly Held Accounts Keep that signed form in your records; you don’t send it in. If your co-holder is anyone other than your spouse, each co-holder files separately.
Penalties scale with intent. A non-willful violation can draw a civil penalty of up to $16,536 per account, per year, under the current inflation adjustment.3eCFR. 31 CFR 1010.821 Penalty Adjustment and Table A willful violation jumps to the greater of roughly $165,000 (the inflation-adjusted statutory base) or 50% of the account balance at the time of the violation.4Taxpayer Advocate Service. 2025 Purple Book Legislative Recommendation 35 Assessed year by year, those willful penalties can quickly outstrip the balance itself.
Form 8938: A Second Report at Higher Thresholds
FATCA adds a separate disclosure, filed directly with the IRS on Form 8938, covering a broader category of “specified foreign financial assets” that includes bank accounts, securities, and interests in foreign entities. The thresholds depend on where you live and how you file.
For US residents, Form 8938 is required when total foreign asset value exceeds $50,000 on the last day of the year or $75,000 at any point during the year (single or married filing separately), or $100,000 at year-end or $150,000 at any point (married filing jointly).5Internal Revenue Service. Summary of FATCA Reporting for US Taxpayers For US taxpayers living abroad, the thresholds climb to $200,000/$300,000 (single or married filing separately) and $400,000/$600,000 (married filing jointly).6Internal Revenue Service. Comparison of Form 8938 and FBAR Requirements
When the account is held jointly with a non-US person, you generally report the entire account value on your Form 8938, not just your share. The form attaches to your Form 1040, so it follows the same deadline and extensions as your return.7Internal Revenue Service. Instructions for Form 8938 Statement of Specified Foreign Financial Assets
The penalty for failing to file is $10,000 per year, with an additional $10,000 for each 30-day period after an IRS notice goes unanswered beyond 90 days, up to $50,000 in additional penalties per violation.8Office of the Law Revision Counsel. 26 USC 6038D – Information With Respect to Foreign Financial Assets A reasonable cause exception exists, but the statute specifically excludes foreign secrecy laws as grounds.
FBAR and Form 8938 are separate obligations with different agencies, thresholds, and deadlines. Satisfying one does not excuse the other. Many joint account holders have to file both.
Income Tax on What the Account Earns
The United States taxes its citizens and resident aliens on worldwide income, so every dollar of interest, dividends, or capital gains earned in the account is taxable on your federal return, even if you never bring the money back. Leaving earnings in the account or reinvesting them overseas doesn’t defer anything.
You have to convert foreign-currency amounts into US dollars. The IRS generally requires you to use the exchange rate prevailing on the date you receive or accrue each item of income.9Internal Revenue Service. Foreign Currency and Currency Exchange Rates For practical purposes, many taxpayers use the IRS’s published yearly average exchange rates for interest and dividends that accrue throughout the year.10Internal Revenue Service. Yearly Average Currency Exchange Rates Capital gains on specific transactions should use the spot rate on the transaction date.
If the foreign country withholds tax on interest or dividends paid into the account, you can usually claim that foreign tax as a credit on your US return using Form 1116. The credit reduces your US tax bill dollar for dollar on the same income. You can deduct the foreign tax on Schedule A instead, but the credit almost always saves more.11Internal Revenue Service. Foreign Tax Credit The credit has limitations designed to prevent it from offsetting US tax owed on US-source income, so the math isn’t always a clean one-for-one offset.
The foreign bank may send you a year-end tax statement, but that document follows local reporting rules, not US tax principles. You’ll need to reconcile the account statements yourself to determine the correct US-reportable amounts.
Watch for PFICs Inside the Account
If the account holds mutual funds, money market funds, or similar pooled investments domiciled outside the United States, those holdings are almost certainly passive foreign investment companies (PFICs) under US tax law. The PFIC regime is one of the most punitive in the code, and most people walk into it without knowing it.
When you receive a distribution from a PFIC that exceeds 125% of the average distributions over the prior three years, or when you sell PFIC shares at a gain, the IRS treats the income as an “excess distribution.” That amount is spread across every year you held the investment, taxed at the highest individual rate in effect for each of those years, and hit with an interest charge on top, as if the tax had been owed in each prior year and you failed to pay it.12Internal Revenue Service. Instructions for Form 8621 The effective rate can exceed 50% on a modest gain.
Each PFIC holding requires its own Form 8621, filed annually even in years with no distributions or sales.13Internal Revenue Service. About Form 8621, Information Return by a Shareholder of a Passive Foreign Investment Company or Qualified Electing Fund If your foreign bank offers a default sweep that parks idle cash in an offshore money market fund, that fund is a PFIC. Confirm exactly where any cash balance goes before letting the bank invest it for you.
Gift Tax When Contributions Don’t Match Withdrawals
Putting money into a joint account doesn’t automatically create a gift. The rules depend on how the account is titled. For a standard joint tenancy with right of survivorship, the IRS generally treats a deposit by one co-holder as a completed gift only when the other holder withdraws the funds for their own benefit. The withdrawal is the taxable event, not the deposit.
For a tenancy in common, each holder owns a defined share, so a deposit that exceeds your ownership percentage is treated as an immediate gift at the moment of deposit, whether or not the other person ever touches the money.
Either way, the annual gift tax exclusion shelters the first $19,000 per recipient in 2026.14Internal Revenue Service. Rev. Proc. 2025-32 Below that, no reporting. Above it, the donor files Form 709, United States Gift Tax Return.15Internal Revenue Service. About Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return Filing Form 709 is a disclosure. No actual gift tax is owed until you exhaust your lifetime exemption.
The lifetime exemption dropped sharply in 2026. The doubled exemption from the Tax Cuts and Jobs Act expired at the end of 2025, and the basic exclusion amount reverted to its pre-2018 level of $5 million adjusted for inflation, roughly $7 million per person.16Internal Revenue Service. Estate and Gift Tax FAQs That is roughly half of what was available in 2025. If you and your co-holder have been moving large sums through the account, you may reach the taxable threshold sooner than expected.
Gifts to a Non-Citizen Spouse
If your co-holder is your spouse but not a US citizen, you don’t get the unlimited marital deduction that normally eliminates gift tax between spouses. A special annual exclusion of $194,000 for 2026 replaces the standard $19,000 threshold.17Office of the Law Revision Counsel. 26 USC 2523 – Gift to Spouse Transfers above that eat into your lifetime exemption and require Form 709. Couples where one spouse is a US citizen and the other is not often miss this.
Receiving Money From a Foreign Co-Holder
If the money is moving the other way, a different form applies. When your non-US co-holder puts money into the account and you withdraw more than $100,000 from it for your own benefit during the year, the IRS requires you to report those receipts on Form 3520, Annual Return to Report Transactions with Foreign Trusts and Receipt of Certain Foreign Gifts.18Internal Revenue Service. Gifts From Foreign Person The $100,000 threshold is per foreign donor per year and includes the total of all gifts from that individual, not just withdrawals from the joint account.
The penalty for failing to file is 5% of the unreported gift amount per month, capped at 25%.19Internal Revenue Service. Instructions for Form 3520 On a $200,000 withdrawal, that’s up to $50,000. The money itself isn’t taxable income; the obligation is purely informational. The penalty for ignoring it is harsh.
What Happens When a Co-Holder Dies
When a co-holder dies, federal estate tax rules pull some portion of the account into their gross estate. The default rule includes the entire balance in the decedent’s estate unless the surviving co-holder can prove they contributed some or all of the funds independently.20Office of the Law Revision Counsel. 26 USC 2040 – Joint Interests If the survivor contributed 40% from their own earnings, only 60% is included. The burden of proof falls on the survivor, which is why keeping clear records of who deposited what and when matters so much.
An exception applies when the two co-holders are spouses and no one else is on the account. In that case, exactly half of the balance is included in the deceased spouse’s estate regardless of who contributed. This applies to joint tenancies with right of survivorship and tenancies by the entirety between spouses.20Office of the Law Revision Counsel. 26 USC 2040 – Joint Interests
The 2026 exemption drop matters here as well. With the basic exclusion roughly halved, estates that would have cleared the threshold easily before may now owe tax. The foreign account balance is added to all other assets in the decedent’s worldwide estate when measured against the exemption, since the gross estate includes property held outside the United States.21Internal Revenue Service. Instructions for Form 706
Separate from estate planning, the FBAR recordkeeping rules require you to keep account name, account number, bank name and address, account type, and maximum annual value for at least five years from the FBAR due date.1Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) Longer is wiser since both the IRS and FinCEN can look back further for willful violations. Track each co-holder’s deposits separately. That record is your defense against full estate inclusion and incorrect gift tax treatment.
Fixing Past Non-Compliance
If you already have an unreported foreign joint account, the IRS offers paths back into compliance that avoid the worst penalties. Which one fits depends on whether you also underreported income, where you live, and whether the IRS has already made contact.
If you filed and paid tax on all the account’s income but simply missed the FBAR, you can submit the late FBARs through the BSA E-Filing System with a written explanation. The IRS will not impose penalties as long as you have not already been contacted about an examination or the missing FBARs.22Internal Revenue Service. Delinquent FBAR Submission Procedures
If you also failed to report income from the account, the Streamlined Filing Compliance Procedures let you submit amended returns and delinquent FBARs together. You must certify that your failure was non-willful, meaning it came from negligence, inadvertence, or a good-faith misunderstanding of the law. US residents who qualify pay a 5% miscellaneous offshore penalty on the highest aggregate account balance during the covered period. Taxpayers living outside the United States qualify for the foreign version, which waives the penalty. Both tracks require that you not be under IRS civil examination or criminal investigation for any tax year, even one unrelated to foreign accounts.23Internal Revenue Service. Streamlined Filing Compliance Procedures
These programs become unavailable the moment the IRS contacts you about the unreported accounts. Quietly filing amended returns outside of a formal program, sometimes called a “quiet disclosure,” leaves you exposed to the full range of penalties if the IRS later examines those filings. The worst move is doing nothing.