The expat playbook: 10 lessons that save you stress, tax & money

Steve Thompson - Founder @ Atlas Bridge Wealth | Specialist advice for individuals and families moving to, living in, or leaving Portugal 🇵🇹

December 2, 2025

When people talk about moving abroad, they’ll tell you about the sunshine, the lifestyle, the golf, the slower pace of life.

What they won’t tell you — until you’re already knee-deep in it — is just how messy your financial life becomes the moment you become an expat.

Almost every week I speak to someone who says a version of this:

“Steve, we thought we were prepared… but we had no idea how different everything becomes once you’re no longer UK-resident.”

So, here are the top lessons I share with clients, the things I wish everyone knew before getting on the plane.

1. Understand the Tax Landscape before you move

I had a client recently tell me:

“If we’d spoken to you six months earlier, we’d have saved ourselves a very expensive mistake.”

Residency determines everything, where you pay tax, how your income is treated, what you owe the UK, what you owe your new country, and whether you fall into the 5-year Temporary Non-Residence trap.

Before you move, make sure you know:

✔ How the UK will view you 

✔ How your destination country will view you 

✔ Whether a Double Tax Agreement protects you 

✔ The impact of the timing of asset sales or withdrawals

A little prep before you move can save you years of unpicking the past.

2. Review (and restructure) your investments

Your UK portfolio doesn’t automatically follow you overseas. In fact, many clients tell me:

“We assumed our ISA and UK funds would work the same abroad — we were completely wrong.”

Different countries tax dividends, interest, and capital gains very differently. Some structures stop being tax-efficient the moment you become non-UK resident.

For many expats, this becomes a chance to:

✔ Reduce currency risk 

✔ Improve tax efficiency 

✔ Consolidate reporting 

✔ Align investments with local rules

Often, the first review we do together uncovers things clients didn’t even know were issues.

3. Protect your pension income

For most people, their pension is the biggest part of their financial life. And yet, I regularly hear:

“Nobody explained how my pension would be taxed once I actually moved.”

Your options depend on where you live:

▪ Keep your UK pension 

▪ Move to an International SIPP

▪ Align currency with your spending

And critically: Make sure your UK pension is paid gross by applying for an NT tax code, something many providers won’t tell you about, but saves clients from unnecessary PAYE deductions.

In Portugal, we also have the 85/15 pension treatment, which can dramatically reduce tax when structured correctly.

4. Plan for currency swings, inflation & liquidity

One of my clients in the Algarve said something recently that stuck with me:

“We weren’t worried about the markets, we were worried about the exchange rate.”

And honestly? They’re right. GBP/EUR alone can move 5–10% in a matter of weeks.

To keep things stable:

✔ Hold cash in the currency you spend 

✔ Keep an emergency fund both in the UK and your new country 

✔ Use multi-currency accounts 

✔ Don’t rely on ad-hoc transfers

Sometimes the biggest threat to a comfortable retirement abroad isn’t investment risk, it’s FX risk. We work with an Institutional-level F/X partner to ensure our clients receive the very best rates on the market.

5. Revisit your wills, inheritance plans & legal protections

Moving country doesn’t just change your tax, it changes your legacy.

I’ve had more than one client say:

“We didn’t realise our UK will wasn’t enough here.”

Many countries — especially in Europe — have forced heirship rules. Some have inheritance tax on worldwide assets. Some don’t recognise UK guardianship clauses.

A cross-border estate plan avoids messy, emotional surprises later (ask me about Brussels IV...).

6. Secure your UK tax position for the long term

One of the biggest misconceptions I hear is:

“We live abroad now… so the UK won’t tax us anymore, right?”

Not quite.

Under the UK’s new residency-based IHT reforms (from 2025), your UK exposure can linger for years after you leave, especially if you’ve spent long periods living in the UK previously.

We always map:

▪ Whether you’ll be considered long-term UK resident 

▪ How the “tail on exit” applies 

▪ Whether assets can be made “excluded property” 

▪ How your estate will be treated on both sides

This is where planning truly pays.

7. Align your banking & cashflow systems

Different countries = different systems.

The most common client comment?

“We didn’t realise opening a simple account would be this complicated.”

It gets easier when you have:

✔ Multi-currency banking 

✔ A clear flow of how income enters and how expenses leave 

✔ Separate pots for UK and local spending 

✔ A buffer for FX shocks

Financial confidence abroad starts with having a clean, logical cashflow setup.

8. Keep documentation tidy (you’ll need it for everything)

In cross-border life, paperwork matters more than people expect - tax codes, residency proofs, pension documents, actuarial certificates, bank statements.

A client summed it up perfectly:

“Every organisation wanted something slightly different… we were constantly digging through folders.”

A good adviser handles 80% of this for you. But having your own house in order makes the process so much smoother.

9. Build a trusted team, not a collection of strangers

The biggest difference-maker I’ve seen over the years?

Having a coordinated team.

Your financial adviser, tax specialist, lawyer, immigration adviser, real estate agent, they should all be talking to each other, not working in silos.

One client told me after we setup their team:

“It finally felt like everyone was rowing in the same direction.”

That’s the goal.

10. Start early.....really early

Here’s the most honest line I can give you:

“People rarely regret planning early… but they almost always regret planning late.”

Early planning lets you:

✔ Optimise tax 

✔ Reduce unnecessary costs 

✔ Structure pensions correctly 

✔ Avoid FX shocks ✔ Protect your estate 

✔ Set up banking and admin smoothly 

✔ Move with confidence, not anxiety

Your future self will thank you for it.

Final Thought

Moving abroad is one of the most rewarding decisions many of my clients have ever made, but financially, it’s a completely different world.

With the right guidance, that world becomes manageable, structured and far less stressful.

If you’re thinking of making the move, already abroad, or simply want clarity, I’m always happy to have a conversation — no pressure, no sales pitch, just straightforward guidance.

“We wish we’d spoken to you sooner.” I hear that often.

My job is to make sure you never have to say it.