Your US tax. Sorted.
We handle your US tax so you never have to worry about it.
UK-based US tax specialists for expats, dual citizens, and cross-border professionals. FBAR, FATCA, returns — all handled.
Contact UsWhat we offer.
Built for Americans in the UK. From annual returns to complex cross-border planning, we handle every layer of your US tax obligations so you stay compliant, pay only what you owe, and never lose sleep over the IRS.
- Form 1040 — US resident return for citizens & Green Card holders abroad→
- Form 1040NR — non-resident return for US-source income→
- Form 1040X — amended returns to fix errors or claim missed credits→
- Foreign Earned Income Exclusion (Form 2555) — exclude up to ~$126k→
- Foreign Tax Credits (Form 1116) — offset UK tax against US liability→
- Treaty positions (Form 8833) under the US-UK double tax treaty→
- FBAR / FinCEN 114 — required when foreign accounts exceed $10k in aggregate→
- FATCA reporting (Form 8938) for specified foreign financial assets→
- PFIC reporting (Form 8621) for ISAs, unit trusts and OEICs→
- Form 3520 / 3520A — foreign gifts, distributions and trust reporting→
- Form 8858 — disregarded entities including UK LLPs and sole traders→
- Form 5471 / 8865 — foreign corporations and partnerships→
- US-UK treaty planning — residence, pensions, gains and double-tax relief→
- UK pension tax planning (SIPPs, workplace pensions) under US rules→
- US 401(k) / IRA — UK tax treatment for UK residents→
- ISAs & UK funds — PFIC analysis and election strategy (MTM vs QEF)→
- Federal & state residence reviews when relocating between jurisdictions→
- Expatriation planning (Form 8854) and exit-tax modelling for covered expats→
- Streamlined Filing Compliance Procedures — 3 years of returns + 6 years of FBARs→
- Form 14653 non-wilfulness certification preparation→
- Extension of time to file (Form 4868) — automatic six-month extension→
- IRS notice responses and penalty-abatement requests, prepared for you to submit→
- Late-filing remediation — corrected and late submissions prepared as separately quoted work→
- UK-side filings reconciled where the same case spans both tax systems→
About TaxStone
The only US tax firm built around Americans in the UK.
Most accountants treat US expat tax as a side project. At TaxStone, it’s all we do. IRS Enrolled Agents and ACCA-qualified professionals working in your timezone, with fixed fees and no surprises. We understand both tax systems because we live in the overlap every day.
About UsTaxStone in brief
- What TaxStone is
- TaxStone Ltd, a London tax practice run by IRS Enrolled Agents and ACCA-qualified accountants, focused entirely on US–UK cross-border tax.
- What we do
- US federal and state returns (1040, 1040-NR, 1040-X), FBAR and FATCA reporting, PFIC reporting for ISAs and UK funds, Streamlined catch-up, expatriation filings, US business returns, and UK self-assessment where the case has a US dimension.
- Who we serve
- Americans in the UK, British nationals in the US, dual citizens, Green Card holders, non-resident aliens with US-source income, and people planning a move between the two countries.
- How it works
- Everything by email, so answers are precise and documented. Tell us your situation; we reply within 2 working days with our questions, then a written fixed-fee quote (from £550 (+ VAT for UK-resident clients)). Every return is second-reviewed by an Enrolled Agent.
Why TaxStone.
Fixed fees, not hourly billing. Specialist knowledge, not generalist guesswork. We never charge a percentage of tax saved — you keep every penny. From a straightforward 1040 to complex PFIC reporting, you get the same level of care and precision.
1,000+
Returns Filed
And Counting
100%
US-UK Focus
Cross-Border Specialists
Fixed
Fees
From £550 (+ VAT if UK-resident)
EA & ACCA
IRS-Authorized Professionals
Testimonial
I'd been filing my own US returns for years and had no idea I was missing FBAR and PFIC reporting. TaxStone caught everything, filed three years of amended returns through Streamlined, and now I don't think about it. Fixed fee, no drama, total peace of mind.
Contact TaxStone
Every return, every form, no surprises.
Fixed fees quoted in writing before any work starts. One Enrolled Agent handles your filing from intake to e-file — no hand-offs, everything documented by email.
Contact UsQuick enquiry
Tell us your situation — we reply by email within 2 working days.
Frequently Asked
The questions we hear every week.
Quick answers to the most common US tax questions we get from Americans in the UK, dual citizens, and cross-border families. Still have questions?
All FAQsNot seeing your question? Send it to us directly — we answer every enquiry by email within 2 working days.
Contact TaxStone
Tell us about your situation.
One short form. A real US Enrolled Agent reads every enquiry and replies by email within 2 working days with the questions we need answered, then a written fixed-fee quote. No chatbots, no call-centre hand-offs.
- •Fixed fees from £550 (+ VAT for UK-resident clients) — quoted in writing before any work begins.
- •Streamlined, FBAR, PFIC, FATCA, 5471 — filed by credentialled staff.
- •UK office hours · US-qualified · ACCA & IRS-regulated.