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.
Convention 2001 · IRS x HMRCYour ISA isn't tax-free to the IRS.
Your ISA isn't tax-free to the IRS.
We file every Form 8621 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.
No payment until you e-file · Free PFIC scan · IRS-compliant Forms 8621 / 8938 / FBAR / 1116 / 8833
What we handle for United Kingdom residents
The three things that bite United Kingdom-based US citizens.
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.
Atamatax · run your United Kingdom return
Free draft. Pay only to e-file.
Scan your brokerage, see your PFIC count, review the forms we'd file with the right United Kingdom treaty positions attached. You only pay when (and if) you submit.
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) auto-generated and filed
- · Form 1116 with United Kingdom tax credit allocated
- · Form 8833 when you take a treaty position