Many British people arrive in Spain assuming their ISA comes with them. The money is still there, the account still exists, and nothing obvious has changed. What has changed, though, is how that money is treated for tax purposes, and the difference matters more than most people realise.
Spain does not recognise the ISA wrapper. From the Spanish tax authority’s perspective, your Stocks and Shares ISA or Cash ISA is simply a foreign investment account. The tax-free status that HMRC grants to assets held inside an ISA means nothing in Spain. Once you become a Spanish tax resident, any income or gains generated within your ISA become part of your taxable estate in Spain.
What Spanish residency actually means for your ISA
As a Spanish tax resident, you are liable to Spanish tax on your worldwide income and gains. That includes everything happening inside your ISA: interest earned in a cash ISA, dividends paid by funds or shares, and any capital gains when you sell holdings.
Spain taxes these under its savings income rates, which are separate from the general income tax scale. For the 2025 tax year, those rates run from 19% on the first 6,000 euros of savings income, rising to 21%, 23%, and 27% on higher bands, with the top rate of 28% applying above 300,000 euros. These are not punishing rates, but they are a real cost that simply did not exist when you were filing in the UK.
Can you still add money to your ISA?
No. HMRC rules require you to be UK resident to make new ISA contributions. Once you have moved abroad, your existing ISA stays open and your existing holdings remain, but the account is frozen for new contributions. You will not be penalised for keeping it, but you cannot use it as a savings vehicle going forward in the same way.
Modelo 720 and the reporting obligation
Spain requires residents to declare overseas assets above certain thresholds using a form called Modelo 720. If your ISA holdings exceed 50,000 euros, you are required to declare them. Failure to do so was historically subject to severe penalties, and while the European Court of Justice ruled in 2022 that some of those penalties were disproportionate, the reporting obligation itself remains. Getting this right from the outset is far simpler than dealing with it retrospectively.
The practical question: keep it, restructure, or encash?
This depends on your broader financial position, so there is no single right answer. That said, a few principles are worth understanding.
Keeping your ISA as it is means accepting that income and gains will be taxable in Spain each year. For a small ISA with modest returns, this may be administratively straightforward. For a larger Stocks and Shares ISA generating significant dividends or capital growth, the tax position may become material.
Encashing before you leave the UK is an option worth considering if you are still in the planning stage. At that point, you can crystallise gains while still a UK resident and benefit from the UK’s capital gains tax annual exemption and the ISA’s tax-free status. Once you become a Spanish resident, that window closes.
Restructuring into a vehicle that is better suited to a Spanish tax context is something that some clients do over time. There are investment structures designed specifically for European residents that can offer a degree of tax efficiency within the Spanish system. These are worth exploring if you have substantial assets in an ISA and expect to remain in Spain long-term.
The main thing to avoid
The most common mistake is doing nothing and assuming the ISA operates the same way it always did. It does not. The money is still yours, the account still exists, and your provider will not stop you from holding it. But the tax implications are real, and they begin from the moment you become a Spanish resident.
If you have ISA holdings and are either planning to move to Spain or have already done so, it is worth reviewing your position before the next tax year. The decisions available to you are most straightforward when you act early.
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