Is my Stocks & Shares ISA tax-free to the IRS?

No. HMRC's tax-free status doesn't carry over to the US — income inside an ISA is still reportable, and any Irish-domiciled UCITS held inside it is a PFIC under §1297(a). We classify every position and prepare a Form 8621 worksheet per fund.

How is my SIPP or workplace pension treated?

Article 17 of the UK-US Convention (2001) governs pensions. We attach Form 8833 only when you elect a treaty override; otherwise the default Foreign Tax Credit on Form 1116 applies. Either way the account is disclosed on Form 8938 / FBAR when thresholds are met.

How do you handle the UK April-to-April tax year?

We reconcile your April-April SA100 to the IRS calendar year, splitting accrued income line by line on Form 1116 so the foreign-tax credit lands in the right US year.

Convention 2001 · IRS × HMRC

Your ISA isn't tax-free to the IRS.
We prepare a Form 8621 worksheet for each and reconcile against your SA100.

UK-US Convention 2001 plus the 2002 Protocol covers dividends, interest, pensions, and gains. ISAs and UK pension wrappers get explicit attention because HMRC's tax-free status doesn't carry over.

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Free PFIC scan · Pay to generate the draft package · Mapped Forms 8621 / 8938 / FBAR / 1116 / 8833

What we handle for United Kingdom residents

The three things that bite United Kingdom-based US citizens.

Stocks & Shares ISA

Holdings inside an ISA are still reportable to the IRS — and Irish-domiciled UCITS inside it are PFICs. We classify every position.

SIPP & workplace pension

Article 17 (pensions) handles the treaty position; we attach Form 8833 only when you elect a treaty override, otherwise default credit applies.

HMRC tax-year mismatch

We reconcile your April-April SA100 to the IRS calendar year, splitting accrued income on Form 1116 line by line.

Other treaty desks

Same workflow, different bilateral convention.

FranceConvention 1994 GermanyConvention 1989 SwitzerlandConvention 1996 CanadaConvention 1980 AustraliaConvention 1982

United Kingdom treaty · FAQ

What US citizens in United Kingdom ask us most.

Is my Stocks & Shares ISA tax-free to the IRS?: No. HMRC's tax-free status doesn't carry over to the US — income inside an ISA is still reportable, and any Irish-domiciled UCITS held inside it is a PFIC under §1297(a). We classify every position and prepare a Form 8621 worksheet per fund.
How is my SIPP or workplace pension treated?: Article 17 of the UK-US Convention (2001) governs pensions. We attach Form 8833 only when you elect a treaty override; otherwise the default Foreign Tax Credit on Form 1116 applies. Either way the account is disclosed on Form 8938 / FBAR when thresholds are met.
How do you handle the UK April-to-April tax year?: We reconcile your April-April SA100 to the IRS calendar year, splitting accrued income line by line on Form 1116 so the foreign-tax credit lands in the right US year.

Atamatax · run your United Kingdom return

Free on-screen draft. Pay to generate the PDF package.

Scan your brokerage, see your PFIC count, review the forms with the right United Kingdom treaty positions attached. You pay when you generate the draft PDF package. It maps supported figures to IRS forms and identifies items you or your CPA still need to complete.

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What you walk out with

· Form 1040 + schedules B, D, 1, 2, 3
· One Form 8621 per PFIC (up to 25 per return)
· Form 8938 (FATCA) when thresholds hit
· FinCEN 114 (FBAR) threshold check and separate-filing guidance
· Form 1116 with United Kingdom tax credit allocated
· Form 8833 when you take a treaty position