ISA

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An ISA, or Individual Savings Account, is a UK savings or investment account that is tax-free for UK tax purposes. For U.S. citizens and green card holders, an ISA is not tax-free for U.S. tax purposes. Interest, dividends, capital gains, and certain fund holdings inside an ISA may still need to be reported on a U.S. tax return.

Why it matters for U.S. expats

ISAs are one of the most common UK accounts that create confusion for Americans in the UK. The UK tax treatment does not carry over to the U.S., so an account that feels simple locally can create U.S. reporting, income tax, FBAR, FATCA, and PFIC issues.

The biggest risk is usually a stocks and shares ISA. If it holds UK mutual funds, ETFs, or similar pooled investments, those holdings may be PFICs. That can trigger Form 8621 and a more complicated U.S. tax calculation.

Common questions

1. Are ISAs tax-free for U.S. expats?

No. ISAs are tax-free in the UK, but the IRS does not treat them as tax-free accounts. U.S. expats must report taxable income and gains from an ISA on their U.S. tax return.

2. Do U.S. citizens in the UK need to report ISAs?

Yes, if the ISA produces reportable income, contains reportable assets, or meets foreign account reporting thresholds. ISAs can affect Form 1040, FBAR, Form 8938, and Form 8621.

3. Does a cash ISA need to be reported to the IRS?

Yes, the interest from a cash ISA is reportable on a U.S. tax return. The account may also need to be included on FBAR or Form 8938 if the relevant thresholds are met.

4. Does a stocks and shares ISA create PFIC problems?

It can. UK funds, ETFs, investment trusts, and similar pooled investments inside a stocks and shares ISA may be PFICs for U.S. tax purposes.

5. Is ISA income reported on FBAR?

FBAR reports foreign financial accounts, not income. An ISA may need to be reported on FBAR if the total value of all foreign financial accounts exceeded $10,000 at any point during the year.

6. Is an ISA reported on Form 8938?

Yes, if the ISA is a specified foreign financial asset and the taxpayer exceeds the Form 8938 reporting threshold. Form 8938 is filed with the U.S. tax return.

7. Can U.S. expats claim a Foreign Tax Credit for ISA income?

Usually not for UK tax-free ISA income, because no UK tax is paid on that income. If foreign tax is paid in another situation, the Foreign Tax Credit rules need to be reviewed separately.

8. Should U.S. expats open or keep an ISA?

It depends on the type of ISA and what it holds. A cash ISA is usually simpler for U.S. reporting than a stocks and shares ISA with PFIC investments.

Related forms

• Form 1040: U.S. Individual Income Tax Return
• Form 8938: FATCA reporting for U.S. expats
• Form 8621: Reporting PFICs and foreign investments

When to get help

Professional guidance is important when:

• You are a U.S. citizen or green card holder with a UK ISA.
• Your ISA earned interest, dividends, or capital gains.
• You hold funds, ETFs, or investment trusts inside a stocks and shares ISA.
• You are unsure whether your ISA holdings are PFICs.
• Your foreign accounts may exceed the FBAR or Form 8938 thresholds.
• You have not reported an ISA on prior-year U.S. tax returns.
• You are deciding whether to open, keep, sell, or restructure ISA investments.

Bright!Tax can review your ISA, identify any U.S. reporting requirements, and help you file the correct forms for UK accounts and investments. Get started with Bright!Tax.

Related Bright!Tax guides

• Investing in the UK as a foreigner: Rules, risks, and returns
• Got foreign bank accounts? When U.S. expats file FinCEN Form 114

Official sources

• GOV.UK: Individual Savings Accounts
• IRS: About Form 8621
• IRS: About Form 8938
• FinCEN: Report foreign bank and financial accounts

Reviewed by

Katelynn Minott, CPA & CEO

Last reviewed

June 2026