10 September 2026 – written by Steffen Kemmerzehl – Friendly Assist Accountancy – The Accounting Hub
You might be planning your move to Spain, or you may have lived there for years while much of your financial life remains in Britain.
A UK pension arrives every month. You still have an ISA, savings or investments in Britain. Perhaps you kept the family home, or sold it and now have a substantial amount sitting in a UK account. You might also be helping children or grandchildren back home.
None of this is unusual. The awkward part is that moving yourself, moving your money and moving your tax residence are not necessarily the same thing.
Your British pension can become a Spanish tax matter
If you live in Spain but receive a UK pension, it is easy to assume that a British pension simply remains a British tax matter.
For private-sector pensions, that is generally not how the UK-Spain treaty works. A private pension received by a Spanish tax resident is generally taxable in Spain. Certain government pensions work differently.
This can matter particularly if you already live in Spain but UK tax is still being deducted from a pension.
The starting question should therefore be less about where the pension provider is and more about where you are actually tax resident and what type of pension you receive.
The ISA you spent 20 years building
This is one of the stranger consequences of moving. Imagine you have £150,000 in a Stocks and Shares ISA. It has been carefully built up over many years and, in Britain, you think of it simply as your tax-free investment account. Then you move to Spain.
You can generally retain an existing ISA from the UK side, although normally you cannot continue subscribing while non-resident. But Spain does not have to recognise the UK’s tax-free wrapper. This leads to questions people genuinely find themselves asking:
Should I sell my ISA investments before moving? Should I keep them in case I eventually return to Britain? Should I put more into my pension before leaving instead?
One person preparing to move to Spain even considered selling their entire ISA before the move and reinvesting afterwards in an attempt to establish a new acquisition value. Another wondered whether there was any point retaining their ISA at all if Spain would not give it the same tax treatment. These are real dilemmas people encounter, but the right answer depends heavily on dates and individual circumstances.
Doing something substantial purely because “Spain taxes ISAs” can therefore be just as risky as doing nothing.
“Will Spain tax me when I transfer £85,000?”
This sounds like a simple question, but it illustrates a much bigger issue. Suppose you move £85,000 from your British bank account into your Spanish account. The first question isn’t necessarily how much tax is due on the transfer? It is where did the £85,000 come from?
Money you saved years ago is different from a pension withdrawal. A pension withdrawal is different from selling shares. Selling shares is different from receiving rent. An inheritance is different again.
A real cross-border question involved roughly £85,000 and uncertainty over the tax consequences of moving it between Spain and Britain. The important part quickly became the source of the money, not simply which bank was sending it.
For larger transfers, keeping clear evidence showing where the money came from can also be extremely useful.
What if it’s £650,000 rather than £85,000?
Consider another perfectly realistic retirement. You take a pension lump sum, sell your UK home and plan to buy your retirement property in Spain.
For a few months, however, you have £650,000 sitting in cash while you search for the right Spanish property. This isn’t hypothetical either. A couple planning their retirement to Spain faced almost exactly that situation.
Suddenly there are several questions rather than one. Where should the money sit? What interest will it generate? Where will you be tax resident while it is sitting there? When should pounds become euros? Some of those are tax questions. Others are investment or currency decisions requiring appropriately authorised advice.
The important point is that selling the house and transferring the proceeds to Spain isn’t necessarily one transaction from a tax perspective. Several separate events have happened along the way.
Your UK house can keep you connected to HMRC
Perhaps you didn’t sell. You moved to Spain but kept the house in Newcastle, London or Manchester because you weren’t certain the move would be permanent. Now you rent it out. That property can keep you firmly connected to the UK tax system.
UK rental income can remain taxable here, with Self Assessment and the Non-Resident Landlord Scheme potentially relevant. The income can also matter in Spain, with the treaty helping determine how double taxation is dealt with. So somebody who thought “I left Britain three years ago, HMRC doesn’t really concern me anymore” can still have perfectly normal UK filing obligations.
Your money doesn’t have to enter Spain to become relevant there
This is probably the biggest mental adjustment.
Imagine your UK financial life looks like this:
£1 million house, £100,000 ISA, £180,000 SIPP and £80,000 cash.
A person considering a move to Spain presented almost exactly that combination online while trying to work out what should be sold, retained or transferred.
It is tempting to think the British assets remain on one side and your new Spanish life begins on the other.
Tax residence doesn’t necessarily respect that boundary.
Once you are Spanish tax resident, overseas income and assets can become relevant under Spanish rules even though the accounts themselves never left Britain.
This is where Spanish professional advice can be important alongside UK advice.
The date you move can matter more than expected
Someone planning to move in April might naturally think: I’ll sell the investments before the flight and sort everything out first.
But the UK tax year runs from April to April while Spain works on a calendar-year basis. Tax residence also involves more than simply counting from the day your removal van arrives.
This is exactly why people moving between Britain and Spain become confused about whether they should sell investments in January, April or after arriving. Online discussions contain remarkably confident and contradictory answers to precisely this question.
For somebody selling a modest investment, the difference may not be dramatic. For someone selling a business, property or a six-figure portfolio, it deserves more attention.
What if Spain isn’t forever?
People also make financial decisions on the assumption that they will never return.
Then five years later there are grandchildren, elderly parents, health considerations or simply a change of mind. The UK has temporary non-residence provisions that can affect certain income and gains when someone returns after a period abroad. Interestingly, even people discussing what to do with their ISA before moving to Spain frequently end up at the same question: Are you absolutely certain you’re never coming back?
You don’t need to organise your life around a hypothetical return. But before making a major disposal specifically because you are non-resident, it is worth considering.
And then your daughter asks for £50,000
Perhaps you’ve been in Spain for ten years and everything is settled.
Then your daughter in Britain needs help buying a house, or you want to pay university costs for a grandchild. The money might even still be sitting in Britain. It feels straightforward: it’s my money, I’m giving it to my family. But now the person giving the money lives in one country, the recipient lives in another and your estate may contain assets in both.
That brings gifts, inheritance and estate planning into the picture, and moving abroad does not necessarily make your previous UK connections irrelevant.
Already living in Spain? You can still tidy things up
You don’t need to be preparing for a move for any of this to be useful. Sometimes the move happened five or ten years ago. The pension still comes from Britain, an ISA was simply left where it was, the old house is rented out and nobody has looked at the overall UK position for years.
A useful starting point can be surprisingly simple. Put your UK pensions, ISAs, savings, investments, property and other income on one page. Then ask where you are tax resident, which country can tax each item, and whether anything still needs reporting or claiming in Britain.
At Friendly Assist Accountancy, we help international clients with the UK side of these situations, including residence, Self Assessment, pensions and other UK income, property, HMRC correspondence and double-tax matters.
If you’re planning to move to Spain, or already live there while your pension, property, investments or savings remain in Britain, feel free to get in touch. We can look at the UK side, identify what actually needs attention and flag where separate Spanish, investment, pension or legal advice is appropriate.
I’m Steffen Kemmerzehl, an AAT Licensed Accountant at Friendly Assist Accountancy. I work with UK and international clients on tax residence, overseas income, pensions, property and other cross-border UK tax matters.
Please get in touch if you’re interested in arranging an appointment.
Useful resources
UK-Spain Double Taxation Convention
Spanish Tax Agency: UK income received by Spanish residents
Friendly Assist Accountancy: UK Tax Help
General information only. Individual UK and Spanish tax treatment depends on your circumstances. Spanish tax, investment, pension and legal advice may require an appropriately qualified professional.