Two tax systems.
One deadline
you can't afford to miss.

If you are UK tax resident and have untaxed income — self-employment, rental income, or investment income above the personal allowance — you need to file a Self Assessment with HMRC. If you're employed and all your income is taxed via PAYE, you may not. We'll tell you in a quick call whether you need to file.

Not if it's managed correctly. The UK–Spain Double Taxation Treaty prevents the same income being taxed twice. In practice, you pay tax in one country and claim relief in the other. How it works depends on your residency status and the type of income — which is exactly what we advise on.

Yes. There is no nationality or residency requirement to form a UK limited company. You can be a director and sole shareholder regardless of where you live. We handle the formation, Xero setup, and all ongoing compliance.

The Statutory Residence Test (SRT) determines whether you are UK resident for tax purposes in a given tax year. It matters because UK residents pay UK tax on worldwide income, while non-residents only pay on UK-source income. If you split your time between the UK and Spain, your residency status needs careful consideration.

If you are UK tax resident, you are required to declare worldwide income — including Spanish rental income — on your UK Self Assessment. The UK–Spain treaty and any Spanish tax already paid are taken into account to avoid double taxation, but the disclosure obligation in the UK still applies.

The NIE (Número de Identificación de Extranjero) is a Spanish tax identification number for foreigners. You need it if you have tax obligations in Spain — for example, if you own property there, have Spanish income, or are required to file a Spanish tax return. It is not required to live or work in the UK.

Modelo 720 is a Spanish informative declaration for Spanish tax residents who hold assets abroad — bank accounts, investments, or real estate — worth more than €50,000 in each category. If you are a Spanish tax resident with significant UK assets, you may be required to file it. The penalties for non-compliance are severe. We advise on this as part of our cross-border service.