◉ Pensions & Investments
ISAs & UK funds (PFIC)
ISAs are not tax-free for US persons. Unit trusts, OEICs, and investment funds inside ISAs are typically PFICs.
Overview
Why this filing matters
ISAs are not tax-free for US persons. Unit trusts, OEICs, and investment funds inside ISAs are typically PFICs.
Note — ISAs reportable as PFICs.
◉ Who this is for
- •US persons with stocks & shares ISAs
- •Clients with UK fund-based investments
✓ What you get
- ✓Per-holding PFIC analysis
- ✓Election strategy (MTM vs. QEF)
- ✓Annual 8621 filings
At a glance
- Key forms
- 8621
- Category
- Pensions & Investments
- Turnaround
- 2–3 weeks once documents are complete
- Filed by
- ACCA-qualified IRS Enrolled Agent
Our approach
Built for the cross-border edge cases.
Most US-UK filings fail the same way: a treaty position that wasn't disclosed, a foreign account that slipped under FBAR thresholds, a PFIC election filed in the wrong year, a carry-forward not tracked from one preparer to the next. The cost of any single one of those is rarely catastrophic on its own — it's the compounding over multiple filing seasons that quietly turns a clean tax life into a six-figure remediation project.
We start every engagement by looking at the edge cases first — the elections, the disclosures, the carry-forwards, the side-effects on next year's return — and only then turn to the routine line items. The result is a filing that reads cleanly to anyone who picks it up next: another preparer, the IRS, or a successor in your own business.
- Position memo on every meaningful election, with the reasoning written down for the next return
- Carry-forwards (FTC, capital losses, PFIC basis) tracked year-on-year so nothing expires unused
- Plain-English commentary on every position taken — the kind that makes a future audit a non-event

Our process
How we handle your filing
Four steps from first call to filed return. Fixed fee confirmed before any work begins.
01
Intake
30-minute scoping call. We confirm your situation, required filings, and send a tailored document list.
02
Review
We analyse your position, flag any cross-border risks, and confirm the scope and fee before any work starts.
03
Prepare
Draft returns and schedules are prepared with plain-English commentary on key positions for your review.
04
File
E-file with the IRS / FinCEN, send confirmations, and handle any follow-up notices or questions.
Pricing
Fixed fees — no surprises
ISA/PFIC strategy review: £350 + VAT. Annual PFIC reporting (Form 8621) is £150 + VAT per holding, with volume discounts for multiple funds.
FAQs
Common questions
Related services
Others in Pensions & Investments
UK pension tax planning
How SIPPs and workplace pensions are treated under US law and the US-UK treaty — contributions, growth, and distributions.
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US 401(k) / IRA — UK tax treatment
How the UK taxes your US retirement accounts during growth, contributions, and distributions — and how the treaty interacts.
Learn more →
Ready to get this filed?
Tell us your situation and we’ll confirm scope, a fixed fee, and the documents we need — usually within one business day.