Choosing a UK tax adviser when you live abroad isn't just about finding someone who can file a tax return. If you've left the UK with income still here, you're coming back after years overseas, or your money crosses borders, you need someone who works with these rules every day.
The wrong adviser can cost you thousands in missed reliefs, penalties for incorrect filings, or positions that attract HMRC's attention for the wrong reasons. The right one saves you money, protects your compliance record and gives you a clear answer on where you stand.
This guide explains what makes expat tax different, the checks to run before you engage anyone, what changed for tax advisers in 2026, and the red flags to walk away from.
If you would rather speak to one now, Global Tax Consulting is a UK expat tax advisor for people leaving, returning to or living outside the UK.
Why is expat tax harder than standard UK tax?
What does a cross-border position add? A standard return asks how much you earned. An expat return first has to answer where you're resident, which country gets to tax each type of income, and which reliefs and claims apply. Four areas cause most of the problems:
The Statutory Residence Test: it isn't a simple day count. Automatic tests, five UK ties and split-year cases can each change the answer. See our Statutory Residence Test 101.
Double tax treaties: each of the UK's treaties is different. Applying the wrong article means paying tax twice or claiming relief you're not entitled to. See how UK double tax treaties work.
The FIG regime: since April 2025, new arrivals who haven't been UK resident for ten years can exempt foreign income and gains for four years, but the claim has a cost. See our guide to the 4-year FIG regime.
Non-resident property rules: selling UK property while living abroad needs a 60-day return, even when there's no tax to pay. See non-resident capital gains tax.
These rules interact. A residence conclusion drives the treaty position, which drives the forms, which drive the refund. That's why expat work needs a specialist rather than a general practice.
General accountant or expat specialist?
Does it really matter who prepares the return? Most high-street accountants focus on domestic clients: small businesses, landlords and employees with UK-only income. They prepare standard returns efficiently, but rarely see residence reviews, treaty claims or FIG elections. When they do, they're often learning on your case.
Image 1 — same tax return, different questions
Area | General accountant | Expat specialist |
|---|---|---|
Residence | Assumes you're non-resident once you've left | Works through the SRT, ties and split-year cases |
Treaty claims | Taxes the income in the UK by default | Checks the treaty and claims relief, for example with DT-Individual |
UK property abroad | May miss the 60-day return | Files the 60-day return and NRL1 on time |
New arrivals | Reports foreign income normally | Models whether a FIG claim is worth its cost |
Forms | Uses HMRC's free service, which can't file the SA109 | Files the SA109 residence pages with the return |
Other country | Out of scope | Coordinates with your adviser there |
This is an illustrative comparison of typical practice.
The gaps show up in predictable places. A missed 60-day property return. An overseas pension taxed in the UK when the treaty gave the taxing right elsewhere. A return filed without the SA109 residence pages, so the split year or treaty claim was never made.
A specialist works mainly with clients who have cross-border exposure, and keeps current on:
Residence: the SRT, split-year cases for leavers and arrivers, and HMRC's guidance in RDR3.
Treaties: how the tie-breaker and income articles work across many countries.
Regime changes: the end of the remittance basis, the FIG regime and residence-based inheritance tax from April 2025.
Both sides: how UK tax interacts with the tax in your other country, and when to bring in a local adviser.
Six checks before you engage an adviser
How do you tell a capable adviser from a risky one? Run these six checks before you sign anything.
Image 2 — six checks before you sign
Check | What to look for |
|---|---|
1. Qualified | A CTA, ATT, ICAEW or ACCA member you can find in the body's directory |
2. Registered with HMRC | Paid advisers who deal with HMRC must register from 2026 (Finance Act 2026) |
3. Supervised and insured | Anti-money laundering supervision plus professional indemnity cover |
4. Clear scope and fee | An engagement letter and a fixed fee for defined work |
5. Secure systems | An encrypted portal and e-signature, not email attachments |
6. Proven with expats | Verified reviews and clients in your exact situation |
1. Qualifications you can verify
"Tax adviser" isn't a protected title in the UK, so anyone can use it. Look for membership of a professional body that sets exams, requires continuing training and runs a complaints process: the Chartered Institute of Taxation (CTA), the Association of Taxation Technicians (ATT), the ICAEW or ACCA. Check the member directory rather than taking a logo on a website at face value.
2. Registered with HMRC
What changed in 2026? Finance Act 2026 made it a legal requirement for anyone paid to deal with HMRC on a client's behalf to register with HMRC and meet minimum standards. Registration opened on 18 May 2026 and is being phased in, with the final stages running into early 2027.
An adviser who isn't registered, or can't be, won't be able to talk to HMRC for you. Ask whether they have an agent services account and are registered under the new rules. HMRC doesn't endorse individual firms, so registration is a minimum, not a recommendation.
👉 HMRC guidance: registering as a tax adviser with HMRC
👉 GOV.UK: tax advisers to register with HMRC and meet minimum standards
3. Supervised and insured
Tax advisers must be supervised for anti-money laundering, either by their professional body or by HMRC. Expect identity checks when you sign up. They're a sign the firm is doing things properly, not bureaucracy for its own sake. Ask, too, whether the firm holds professional indemnity insurance.
4. A clear scope and a clear fee
Is the price for the whole job? Transparent pricing protects you from surprises. Hourly billing charges for every email and call, and you won't know the final cost until the work is done.
A fixed fee for a defined piece of work, such as a tax return, a residence review or a disclosure, gives you certainty and removes any incentive to take longer. Check the engagement letter says what's included: the SA109 residence pages, treaty claims, correspondence with HMRC and any foreign tax credit calculations.
5. Secure systems
You'll be sharing bank statements, employment contracts and investment records. A good adviser gives you an encrypted portal for documents, electronic signature for authorisations, and a way to see where your work stands without chasing. Unencrypted email attachments and paper-only processes are warning signs for both security and speed.
6. Reputation and responsiveness
Client feedback reveals patterns a sales call won't. Read verified reviews on Google or Trustpilot for what they say about response times and clarity, not just the star rating. Responsiveness matters most in the weeks before a deadline.
How does authorising an adviser work?
What does your adviser need from you? For Self Assessment, you authorise them through HMRC's online service or, where that isn't possible, on paper form 64-8. Once authorised, they can file returns, make claims and talk to HMRC about your position.
If you only want help with one specific issue, that's limited authorisation, and HMRC now needs a signed letter rather than a 64-8. Either way, you remain legally responsible for your own tax, and you must check your return before your adviser files it.
👉 HMRC guidance: authorising an agent (64-8)
Our guide to HMRC forms for expats covers the 64-8 and the other forms you're likely to meet.
Questions to ask on the first call
How many clients do you have in my situation? Leaving, arriving, non-resident landlord or dual resident, the answer should come easily.
Which country do you advise on? A UK adviser should say so, and tell you how they coordinate with your adviser in the other country.
What's included in the fee? Get the scope in writing, including HMRC correspondence.
Who will do the work? Find out whether a qualified person prepares or reviews your return.
What do you need from me, and by when? A clear checklist and timetable is a good sign of a well-run practice.
Red flags
Promises of zero UK tax: if an adviser offers to eliminate your UK liability through structures HMRC supposedly won't notice, that's non-compliance dressed up as planning. It ends in back tax, interest and penalties.
No expat track record: if the first conversation shows few expat clients or no experience of your scenario, keep looking.
Vague answers on registration or credentials: a professional will happily confirm their qualifications, supervision and HMRC registration.
Slow, unclear communication: days to return a call and vague answers to simple questions rarely improve once you've signed.
How Global Tax Consulting meets these criteria
How do we measure up? Global Tax Consulting was founded in April 2023 by Emma McDermott, ATT, who previously worked at Deloitte and has been a member of the Association of Taxation Technicians since 2020. You can read our 104 reviews on Trustpilot and 134 reviews on Google, as at October 2026.
Frequently asked questions
Do I need a specialist tax adviser if I live abroad?
Not always. If you only have UK income taxed under PAYE, you may not need one. If you have UK rental income, a pension, a property sale, a split year or income in two countries, a specialist is usually worth the fee because the residence and treaty claims drive how much you pay.
What qualifications should a UK tax adviser have?
Look for membership of a professional body such as the Chartered Institute of Taxation (CTA), the Association of Taxation Technicians (ATT), the ICAEW or ACCA. "Tax adviser" isn't a protected title, so check the body's member directory.
Do tax advisers have to register with HMRC?
Yes. Under Finance Act 2026, anyone paid to interact with HMRC on a client's behalf must register with HMRC and meet minimum standards. Registration opened in May 2026 and is being phased in until early 2027.
How do I authorise an adviser to deal with HMRC?
Through HMRC's online authorisation service or, if that isn't possible, on form 64-8. For help with a single issue, HMRC needs a signed letter of authority instead. You stay legally responsible for your own tax either way.
Is a fixed fee better than hourly billing?
For defined work such as a tax return, residence review or disclosure, a fixed fee gives you certainty and removes any incentive to take longer. Complex advisory projects can still suit an hourly or staged arrangement, agreed in writing.
work with GTC
Get your position confirmed in writing
Global Tax Consulting advises internationally mobile individuals on residency reviews, UK tax planning and tax return preparation. Tell us where you are and what you earn, and you will have a fixed fee and a clear view of your UK tax position.
⭐ 5★ rated