UK Tax Adviser for the USA
A Chartered Tax Adviser for the UK side of a life across the Atlantic
UK tax returns, residency and pension advice for Brits moving to the USA, people in America with UK income, and Americans arriving in the UK. Fixed fees, agreed first.
The Short Answer
Horizon UK Tax Solutions is a Chartered Tax Adviser (CTA) practice handling the UK side of a life connected to the United States: Britons moving to America, anyone in the USA with UK property, pensions or income, and Americans arriving in the UK. Three issues dominate. Once you become a US tax resident, the United States taxes your worldwide income, not just US earnings. A US citizen in the UK files a Form 1040 every year alongside UK Self Assessment, with the treaty and foreign tax credits relieving most double tax. And Article 17 of the UK-US treaty decides who taxes a 401(k), an IRA or a SIPP.
The traps are procedural and dated. Sell a UK property after you leave and a non-resident CGT return is due within 60 days of completion, even with no gain. UK rent falls into the Non-Resident Landlord Scheme, with 20% deducted unless HMRC approves an NRL1 application. Split-year treatment is claimed on the SA109, never automatically, and HMRC's free service cannot file that page. Since 12 March 2025 HMRC also taxes a UK resident on lump sums from taxable US pension plans, with credit for US tax paid. A UK limited company becomes a controlled foreign corporation once its US-resident owner holds more than half of it, a decision for before departure. We handle each, in the right order.
Working with Horizon is simple. Everything is handled remotely, with year-round support and direct access to Jordan Onraet-Wells, a CTA with over 10 years of experience including 7 at a Big Four firm. Fees are fixed and agreed in writing before any work starts: a non-resident or expat return is £550, personal returns from £350, complex returns from £750, advisory work quoted as a fixed fee upfront. Never an hourly rate. Horizon leads on the UK and cross-border position and coordinates vetted US specialists where a US filing is needed; it does not prepare US returns. Rated 5.0 on Google from 19 reviews. Start with a free 30-minute clarity call.
What We Do
Handled for you, end to end
- Departure-year Self Assessment with the SA109 residence pages and split-year claim, or form P85 where no return is due
- Non-resident landlord returns and NRL1 applications so UK rent reaches you gross instead of with 20% deducted at source
- The non-resident CGT return on a UK property sale, filed and paid within 60 days of completion even when nothing is due
- Drawing a UK pension from the USA: the Form US-Individual 2002 claim and NT code so your SIPP is paid gross under Article 17(1)
- Arrival-year planning for Americans moving to the UK: residence start date, split-year claim, and whether a FIG claim saves anything once US tax is counted
- Reporting 401(k), IRA, Roth and US Social Security income on your UK return, sharing the figures with your US preparer so credits line up
From Clients in This Position
After moving to the UK (Scotland) from the US, I didn’t realise what kind of tax I would be facing but I thought “Hey! Self assessment tax return can’t be that hard right?” Well, it is. Well, then I found Jordan. Life got really simple after that. Look up the company on the website and setup a clarity call. I know you won’t be disappointed. It only sucks that I can’t give him more than 5 stars.
Very clear and helpful dealing with US/UK issues. Recommend Jordan and Horizon.
Free In-Depth Guides
Guides for the USA, if you want the detail first
Country Guides
Moving to the US from the UK: the 2026 tax guide
Become a US tax resident and the United States taxes your worldwide income, not just what you earn in America. This guide walks the UK-to-US move through both systems.
11 min read · Reviewed July 2026
US-UK Tax
US-UK Tax Guide: Americans in the UK & Brits in the US
Americans in the UK and Brits in the US sit inside two tax nets at once. Getting the interaction right is what keeps the total bill fair rather than doubled.
12 min read · Reviewed July 2026
US-UK Tax
Americans Living in the UK: Tax Explained
Americans living in the UK tax guide: how the US and UK both tax you, dual filing, treaty relief, FBAR and FATCA reporting and the traps to avoid.
12 min read · Reviewed June 2026
US-UK Tax
The US-UK Tax Treaty Explained: How It Works for Individuals
How the US UK tax treaty works for individuals: the residence tie-breaker, the saving clause, pensions, dividends and claiming double tax relief in practice.
13 min read · Reviewed June 2026
Moving to the UK
Moving to the UK from the USA: the 2026 tax guide
An American moving to the UK keeps filing US returns for life while picking up UK residence under the SRT. This guide covers arrival timing, split-year treatment, the 4-year FIG regime and the FEIE-to-credit handoff.
9 min read · Reviewed July 2026
US-UK Tax
401(k), IRA and Roth: UK Tax Treatment
401k UK tax rules explained: how the UK-US treaty taxes 401(k) and IRA withdrawals, lump sums, the Roth IRA position and what UK residents must report.
10 min read · Reviewed July 2026
US-UK Tax
UK Pensions When You Move to the USA: The Full Picture
Most people moving to the USA simply keep their UK pensions: the treaty protects growth, taxes regular withdrawals only in the US and covers the State Pension too. The 25% tax-free lump sum and the April 2027 inheritance tax change are where the planning lives.
8 min read · Reviewed July 2026
Cross-Border Business
Keeping a UK Limited Company When You Move to the USA
You can keep your UK limited company when you move to America, but the day you become a US tax resident it usually becomes a controlled foreign corporation in the US system. The keep, restructure or close decision is far cheaper to make before that day.
8 min read · Reviewed July 2026
US-UK Tax
The US to UK Arrival Year: How Your First Tax Year Works
Move from the US to the UK mid-year and you sit inside two tax systems at once. This playbook walks through the SRT, the split-year cases for arrivers, claiming the FIG regime on the SA109, the US side in outline and the treaty tie-breaker for the overlap.
8 min read · Reviewed July 2026
Quick answers for the USA
- Do I pay UK tax if I move to the USA?
- Do US citizens in the UK pay tax twice?
- What UK taxes apply when moving from the USA?
- Do I pay UK tax on 401(k) withdrawals?
- How is a Roth IRA taxed in the UK?
- Is my US Social Security taxed in the UK?
- What happens to my UK pension if I move to the USA?
- Can Americans in the UK have an ISA?
Free Tax Tools
Run your own numbers, before we speak
UK Statutory Residence Test Calculator
Free UK Statutory Residence Test calculator. Enter your UK days, work pattern and ties for an instant indication of whether you are UK resident, with the deciding test and full reasoning.
Try it freeUK vs US Take-Home Pay Comparator
Free tool: compare your take-home pay in the UK versus the US, including federal, state, National Insurance and FICA, to see the real cost of a transatlantic move. Indicative, 2026.
Try it freeSplit-Year Treatment Case Finder & 5-Year Trap Checker
Free tool: find which of HMRC’s eight split-year cases applies when you move to or from the UK, and check whether the 5-year temporary non-residence trap could tax your gains on return. 2026/27.
Try it freeOur Promise
Fixed fees, agreed in advance
We confirm your fee in writing before any work begins. You always know exactly what you are paying, billed as a fixed amount, never in arrears by the hour.
What this work costs
Non-resident and expat tax returns are £550 fixed. Personal tax returns start from £350 and complex returns from £750. Advisory and project work, such as residency planning and capital gains strategies, is quoted as a fixed fee agreed upfront, scoped to your situation. All fees are agreed before work begins.
See full fixed-fee pricingCommon Questions
Honest answers, before you book
More questions? Read our full FAQ.
Other Countries
UK tax advice, wherever you are moving
- UK Tax Adviser for Dubai and the UAE
- UK Tax Adviser for Saudi Arabia
- UK Tax Adviser for Qatar
- UK Tax Adviser for Bahrain
- UK Tax Adviser for Oman
- UK Tax Adviser for Canada
- UK Tax Adviser for Australia
- UK Tax Adviser for New Zealand
- UK Tax Adviser for Spain
- UK Tax Adviser for Portugal
- UK Tax Adviser for Germany
- UK Tax Adviser for France
- UK Tax Adviser for Italy
- UK Tax Adviser for the Netherlands
- UK Tax Adviser for Switzerland
- UK Tax Adviser for Ireland
- UK Tax Adviser for Poland
- UK Tax Adviser for Cyprus
- UK Tax Adviser for Singapore
- UK Tax Adviser for Thailand
- UK Tax Adviser for Malaysia
- UK Tax Adviser for Japan
- UK Tax Adviser for South Africa
Ready When You Are
Start with a free clarity call
Book a free clarity call and we will talk through your situation and confirm a fixed price in writing: no obligation, no pressure, and no surprises.
Prefer email? Reach us at jordanonraet-wells@horizonukts.com