Sharing a bank account outside the United States with another person puts you inside a web of US reporting and tax obligations that most account holders underestimate. The international joint bank account tax rules cover four separate areas: annual disclosure of the account itself, income tax on everything it earns, gift tax when contributions or withdrawals are lopsided, and estate tax when a co-holder dies. Each area has its own thresholds, forms, and penalties, and satisfying one obligation never excuses another.
How the Account Is Titled Changes the Tax Result
Before any form gets filed, the ownership structure of the account decides how the tax rules apply to you. Most joint accounts fall into one of two shapes.
A joint tenancy with right of survivorship gives each holder an undivided interest in the whole balance, and when one holder dies the survivor automatically takes the account without probate. This is the default at most banks, though the foreign jurisdiction’s own law may modify 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 rather than to the survivor. The distinction matters for gift tax because a deposit into a tenancy-in-common account that exceeds your ownership share is an immediate gift, not a future one.
Signatory authority is a separate concept. It is the power to direct the bank to move money, and you can hold it without owning any of the funds. The distinction offers less relief than it sounds like, because FBAR reporting reaches both owners and signatories.
The Two Annual Disclosures: FBAR and Form 8938
Two different agencies want to know about your foreign account, and they use different forms, different thresholds, and different deadlines.
FBAR (FinCEN Form 114)
If the combined maximum value of all your foreign financial accounts crosses $10,000 at any point during the calendar year, you must file FinCEN Form 114, the Report of Foreign Bank and Financial Accounts.1Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) The threshold is aggregate across every account you own or have signatory authority over, not per account. $6,000 in a joint UK account and $5,000 in a personal account in Canada puts you over the line.
The form is filed electronically through FinCEN’s BSA E-Filing System, separately from your tax return. The deadline is April 15, with an automatic extension to October 15 that you do not have to request.1Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) You report the maximum value the account reached during the year, converted to US dollars.
Spouses who jointly own a foreign account do not necessarily need to file two FBARs. One spouse can file a single report covering both, provided both sign Form 114a, Record of Authorization to Electronically File FBARs, and keep it in their records.2Financial Crimes Enforcement Network. Reporting Jointly Held Accounts That form is not submitted to FinCEN. If your co-holder is anyone other than your spouse, each co-holder files separately.
The penalties are severe. A non-willful violation carries a maximum civil penalty of $16,536 per account, per year, at the current inflation adjustment.3eCFR. 31 CFR 1010.821 Penalty Adjustment and Table A willful violation carries the greater of roughly $165,000 (the inflation-adjusted statutory base) or 50% of the account balance at the time of the violation, and it can be assessed for each year of non-compliance.4Taxpayer Advocate Service. 2025 Purple Book Legislative Recommendation 35 Cumulative willful penalties can exceed the account balance itself.
Form 8938 (FATCA)
The Foreign Account Tax Compliance Act adds a second disclosure filed directly with the IRS on Form 8938 and attached to your Form 1040. It covers “specified foreign financial assets,” a broader category than the FBAR’s accounts, and its thresholds depend on where you live and how you file.
For US residents, the filing thresholds are:
- Single or married filing separately: foreign asset value over $50,000 on the last day of the tax year or over $75,000 at any point during the year.
- Married filing jointly: over $100,000 on the last day of the tax year or over $150,000 at any point during the year.5Internal Revenue Service. Summary of FATCA Reporting for US Taxpayers
For US taxpayers living abroad, the thresholds rise substantially:
- Single or married filing separately: $200,000 on the last day of the year or $300,000 at any time.
- Married filing jointly: $400,000 on the last day of the year or $600,000 at any time.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 rather than only your proportional share.7Internal Revenue Service. Instructions for Form 8938 Statement of Specified Foreign Financial Assets
The penalty for failing to file Form 8938 is $10,000 per year. If you still have not filed 90 days after the IRS mails you a notice, another $10,000 accrues for every 30-day period the failure continues, up to an additional $50,000 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 explicitly says foreign secrecy laws do not qualify.
FBAR and Form 8938 are independent obligations. Filing one does not cover the other, and many joint account holders file both every year.
Income Tax on What the Account Earns
The United States taxes citizens and resident aliens on worldwide income, so every dollar of interest, dividends, or capital gains inside your foreign joint account is taxable on your federal return. Leaving the earnings in the account, or reinvesting them abroad, does not defer the tax.
Foreign-currency amounts must be converted to US dollars. The IRS generally requires 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 interest and dividends that accrue across the year, many taxpayers use the IRS’s published yearly average rates.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 the interest or dividends paid into the account, you can usually claim the foreign tax as a credit on Form 1116, or deduct it on Schedule A. The credit reduces your US tax dollar for dollar on the same income and almost always saves more than the deduction.11Internal Revenue Service. Foreign Tax Credit The credit has limitations that prevent it from offsetting US tax on US-source income, so it is not always a full offset.
The foreign bank’s year-end statement follows local rules, not US tax principles. Reconcile the account yourself to determine the correct US-reportable amounts.
The PFIC Problem With Pooled Investments
If the account holds foreign mutual funds, money market funds, or similar pooled investments, those holdings are almost certainly passive foreign investment companies (PFICs) under US tax law. This is one of the most punitive regimes in the code, and account holders regularly stumble into it through default cash-sweep arrangements offered by the bank.
When a distribution exceeds 125% of the average of the prior three years, or when you sell PFIC shares at a gain, the IRS treats the income as an “excess distribution.” The excess is spread over every year you held the investment, taxed at the highest individual rate in effect each of those years, and hit with an interest charge as if the tax had been due in each prior year.12Internal Revenue Service. Instructions for Form 8621 Effective rates can exceed 50% on a modest gain.
Each PFIC holding requires its own annual Form 8621, 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 Before letting any foreign bank invest cash held in your joint account, confirm exactly what vehicle the funds sit in.
When Deposits or Withdrawals Become Taxable Gifts
Depositing money into a joint account does not automatically create a gift, but the timing depends on the ownership structure.
For a standard joint tenancy with right of survivorship, the IRS generally treats a deposit by one co-holder as a completed gift to the other only when the non-contributing holder withdraws funds for their own benefit. The withdrawal, not the deposit, is the taxable event.
For a tenancy in common, a deposit that exceeds your ownership percentage is an immediate gift to the other holder at the time of deposit, whether or not they ever touch 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 Gifts below the threshold do not require reporting. Above it, the donor files Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return.15Internal Revenue Service. About Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return Filing Form 709 is a disclosure; no gift tax is owed until you exhaust your lifetime exemption.
The 2026 Lifetime Exemption
The lifetime gift and estate tax exemption dropped 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, which works out to roughly $7 million per person.16Internal Revenue Service. Estate and Gift Tax FAQs That is about half the exemption available as recently as 2025. Couples who have been moving large sums through a joint account may reach the taxable threshold sooner than they anticipated.
Gifts to a Non-Citizen Spouse
If your co-holder is your spouse but not a US citizen, you do not get the unlimited marital deduction that normally erases 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 consume your lifetime exemption and require Form 709. Couples in which one spouse is a citizen and the other is not routinely miss this rule because they assume the unlimited spousal treatment applies.
Receiving Money From a Foreign Co-Holder
The gift tax rules above cover money going out. A different rule covers money coming in from a foreign person.
If your non-US co-holder deposits money into the joint account and you withdraw more than $100,000 for your own benefit during the year, you must report the 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 all gifts from that person, not only withdrawals from the joint account.
The penalty for missing Form 3520 is 5% of the unreported gift for each month the return is late, capped at 25%.19Internal Revenue Service. Instructions for Form 3520 On a $200,000 withdrawal, that is up to $50,000 in penalties. The money itself is not taxable income; the obligation is purely informational, which is why so many people miss it.
When a Co-Holder Dies
When a co-holder of the joint account dies, US estate tax rules pull a portion of the account into the deceased person’s gross estate. How much depends on who contributed the funds and how the account is titled.
Under the general rule, the entire account balance is included in the decedent’s gross 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 in the decedent’s estate. The burden of proof sits on the survivor, so keep clear records of who deposited what and when.
A spousal exception applies when the joint account is held between spouses who are the only co-holders. In that case, exactly half of the account value is included in the deceased spouse’s estate regardless of who contributed, applied to joint tenancies with right of survivorship and tenancies by the entirety.20Office of the Law Revision Counsel. 26 USC 2040 – Joint Interests
The reduced 2026 lifetime exemption also matters here. With the basic exclusion amount roughly halved, estates that would have cleared it easily before may now face tax exposure. The foreign account balance is added to all other worldwide assets when measuring against the exemption.16Internal Revenue Service. Estate and Gift Tax FAQs The gross estate includes property held outside the United States.21Internal Revenue Service. Instructions for Form 706 For FBAR purposes, keep account records, including name, number, bank, 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) Keeping them longer, and tracking contributions by co-holder, is the documentation that protects you against full estate inclusion and against incorrect gift tax treatment.
Fixing Past Non-Compliance
If you already have an unreported foreign joint account, the IRS offers two main paths back into compliance. Which one fits depends on whether you also failed to report the income.
Delinquent FBAR Submission Procedures
If you missed FBARs but reported all the account income on your tax returns and paid the tax, you can file the late FBARs through FinCEN’s BSA E-Filing System with a written explanation for the delay. The IRS will not impose penalties if you have not already been contacted about an examination or about the missing FBARs.22Internal Revenue Service. Delinquent FBAR Submission Procedures
Streamlined Filing Compliance Procedures
If you also failed to report income from the account, the Streamlined Filing Compliance Procedures let you submit amended returns and delinquent FBARs in one package. You must certify that your failure was non-willful, meaning negligence, inadvertence, or a good-faith misunderstanding of the law.23Internal Revenue Service. Streamlined Filing Compliance Procedures
The program has two tracks. US residents pay a 5% miscellaneous offshore penalty on the highest aggregate balance during the covered period. Taxpayers living abroad qualify for the foreign version, which waives the penalty entirely. 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
Both programs close the moment the IRS contacts you about the accounts. Quietly filing amended returns without using a formal program, sometimes called a “quiet disclosure,” leaves you exposed to the full range of penalties if the IRS later examines the filings. If you have an issue to clean up, the streamlined route almost always beats waiting.