There's a particular anxiety that comes with planning your retirement from abroad. You've got income building up in more than one country — a UK or Irish pension here, Swiss pillars there, maybe some investments scattered between them — and you keep coming back to the same dread: when I finally start drawing all this, am I going to be taxed twice? Once by the country that holds the money, and again by the country I actually live in?
It's a reasonable fear, and left unmanaged it can genuinely happen. But it's also largely preventable. The international tax system is built, imperfectly, around the principle that the same income shouldn't be taxed twice — and there are well-established mechanisms to make sure it isn't. The trouble is they don't work automatically. You have to use them correctly, and in the right order. Here's how double taxation actually arises, and how thoughtful retirement planning keeps it from eroding your income.
Why double taxation happens in the first place
Double taxation arises from a simple clash: most countries want to tax their residents on their worldwide income, and many also want to tax income that arises within their borders. So if you live in Switzerland but draw a pension from the UK, you have two countries with a plausible claim on the same money — the UK because the pension originates there, Switzerland because that's where you live.
Without any coordinating rules, you could be taxed by both. The reason that mostly doesn't happen is the network of double-taxation agreements (DTAs, also called tax treaties) that countries sign with one another. The UK and Ireland each have treaties with Switzerland and with most of Europe, and these treaties decide, income type by income type, which country gets to tax what.
How double-taxation treaties protect you
A tax treaty works by allocating taxing rights. For each category of income — employment, pensions, dividends, property, and so on — it says either that only one country may tax it, or that one country taxes it first and the other must give relief for the tax already paid. There are two main mechanisms:
- Exemption: one country simply doesn't tax that income because the treaty assigns it to the other.
- Credit: both may tax it, but your country of residence gives you a credit for the tax paid abroad, so you don't pay the same tax twice — you effectively pay the higher of the two rates, not the sum of both.
The crucial point is that treaty relief is rarely automatic. You generally have to claim it — by certifying your tax residency, completing the right forms, and sometimes applying to have foreign tax not deducted at source (or reclaiming it afterwards). Get the process right and double taxation simply doesn't occur. Get it wrong and you can end up overtaxed for months while you wait on a refund.
How your pension income is taxed across borders
This is where most expats' questions concentrate, so let me be specific — using the UK–Switzerland treaty as the example, while noting the principles are similar (though not identical) for Ireland and other European countries. Always check the specific treaty and current rules for your own situation, as the details and figures change.
Private and workplace pensions
Under the UK–Switzerland treaty, regular pension income from a private or workplace pension is generally taxable in your country of residence — so Switzerland, if that's where you live — rather than in the UK. In practice you'd typically arrange for the UK pension to be paid without UK tax deducted, then declare and pay tax on it in Switzerland.
Pension lump sums
Lump sums from a UK pension scheme are treated differently — under the treaty they're generally taxable only in the UK. This is significant, because it affects whether and how you take tax-free cash and lump sums, and the timing of doing so relative to where you're resident. There can also be Swiss withholding to reclaim in certain cases. The interaction is genuinely intricate and very dependent on personal circumstances.
State and government pensions
The UK State Pension is generally taxed in your country of residence, and — importantly for expats in Switzerland and the EU — it continues to be uprated each year rather than frozen. Government service pensions (for past UK government or local-authority employment) typically remain taxable in the UK under the treaty, even while you live abroad. These distinctions matter, because two people with similar-looking pensions can face quite different treatment depending on the source.
A recurring trap: the UK and Swiss authorities don't always classify a given pension the same way — for instance, whether it counts as "occupational" income. Because the classification changes which country taxes it, it's worth confirming the treatment of each of your specific schemes rather than assuming.
Beyond pensions: investments, property, and capital gains
Double-taxation planning isn't only about pensions. Investment income and gains have their own treaty treatment, and it's easy to trip up. Dividends and interest may be subject to withholding tax at source, with treaty relief available to reduce or reclaim it. Rental income from UK or Irish property usually remains taxable where the property is, with relief claimed in your country of residence. Capital gains treatment varies, and Switzerland's approach to private capital gains differs markedly from the UK's. The headline lesson is that where you hold an investment and where you're resident when you realise it can change your tax bill considerably — which is why investment and tax planning should be done together, not separately.
How to actually avoid being taxed twice
Pulling this together, avoiding double taxation in retirement comes down to a handful of disciplines:
First, establish your tax residency clearly and correctly in your country of residence — much treaty relief flows from being able to prove where you're resident. Second, claim treaty relief properly and in the right order, using the correct forms and certificates, ideally before income starts being taxed at source rather than scrambling for refunds later. Third, plan the sequence and location of your withdrawals — when you take a lump sum versus income, and while resident where, can change the outcome materially. Fourth, coordinate across all your income sources so that pensions, investments, and property are planned as one picture rather than in isolation. And finally, keep good records and file in every country where you have obligations, because double-taxation relief depends on each authority seeing a consistent, documented story.
None of this is exotic. It's mostly about doing ordinary things in the right order, with an understanding of how the two tax systems and the treaty fit together. That's precisely the kind of coordination that's hard to do alone and straightforward with the right guidance.
FAQ
Will I be taxed twice on my UK pension if I live in Switzerland? You shouldn't be, provided you use the UK–Switzerland double-taxation treaty correctly. Broadly, regular pension income is taxed where you live and lump sums in the UK — but relief isn't automatic, so the paperwork matters. The exact treatment depends on your pension type and circumstances.
Which country taxes my pension — the UK or where I live? It depends on the type of pension and the treaty. Generally, private and workplace pension income is taxed in your country of residence, lump sums in the UK, and government service pensions in the UK. State Pension is usually taxed where you live. Always confirm against the current treaty for your situation.
Do double-taxation treaties apply automatically? No — and this catches people out. You usually have to claim treaty relief by proving your residency and completing the relevant forms, sometimes before income is paid. If you don't, you may be taxed at source and have to reclaim it later, which can be slow.
Does Brexit change how my pension is taxed in the EU? The double-taxation treaties between the UK and individual European countries predate and survive Brexit, so the core tax-allocation rules still apply. The mechanics of advice and some reporting changed, but the treaty protection against double taxation remains.
Make the tax system work for you, not against you
Avoiding double taxation in retirement isn't about clever schemes — it's about understanding how two tax systems interact and using the treaty between them correctly and in good time. Done properly, it can make a real, lasting difference to the income you actually keep.
If you'd like to understand how your particular mix of pensions, investments, and residency fits together — and how to keep more than one country from taxing the same income — I'd be glad to talk it through on a free, no-obligation discovery call. No jargon, full transparency on any fees, and no pressure at all. Book whenever it suits you.
This article is general information, not personal financial or tax advice. Cross-border tax outcomes depend entirely on your individual circumstances, and treaties, rules, and thresholds change — always check current figures and take regulated advice (and where appropriate, specialist tax advice) before acting. AM Wealth Management is a CISI Chartered firm.