If part of your income is taxed in one country while you actually live in the other, you can end up paying twice on the same money. The Spain-UK double taxation convention exists precisely to stop that. But the treaty does not apply itself. To lean on it, the Spanish Tax Agency (Agencia Tributaria) usually wants proof of where you are tax resident — and if you are UK resident, that proof is a Certificate of Residence from HMRC. This guide covers what it is, how you ask HMRC for it, and why a document in English so often needs a sworn translation into Spanish before Spain will act on it.
What the certificate actually is
A Certificate of Residence (often shortened to CoR) is an official statement from HM Revenue & Customs confirming that you are resident in the United Kingdom for tax purposes — and, crucially, that you are entitled to benefits under a specific double taxation agreement. It is not a generic "I live in Britain" letter. HMRC issues it in the context of a treaty, and it will decline to certify you if it considers you are not entitled to treaty relief.
The convention behind it here is the Spain-UK double taxation convention, signed in 2013 and in force since 12 June 2014. It sets out which country taxes what — pensions, dividends, interest, employment income, property — and lets a resident of one country avoid being taxed a second time by the other on the same income. When a Spanish payer or the Agencia Tributaria asks you to prove you are covered by that treaty, the HMRC certificate is the document that does it.
Why Spain asks for it
Say you moved to Spain but still receive a UK company pension or dividends from a British firm. Spain, as your country of residence, will generally want to tax your worldwide income. The UK, as the source of the payment, may also withhold tax. The treaty decides who has the primary right and how relief works — but a Spanish official cannot simply take your word that you are UK resident. They need HMRC to say so, in writing, for the relevant period.
That is where the certificate closes the loop: it lets you apply the correct treaty treatment instead of paying in full on both sides and chasing a refund later.
How to request it from HMRC
The good news is that this is a free service and the request is made directly to HMRC — no consulate, no notary. Broadly, individuals apply online through HMRC's request service on gov.uk, or by post using the relevant form. HMRC will normally ask for details such as the country the certificate is for (Spain), the period you need it to cover, and — depending on your situation — information about the days you have spent in the UK and your status under the Statutory Residence Test.
If Spain has handed you a specific form to be stamped, you send that to HMRC together with your request so it can be certified alongside. A CoR is generally treated as valid for 12 months from the date of issue, though you should confirm the current forms, channels and timescales on gov.uk, as HMRC updates them from time to time.
One practical note: exactly what Spain expects — the certificate on its own, a particular treaty form, or both — can vary by the office and the type of income. Check the requirement on the Agencia Tributaria side before you file, so you request the right thing from HMRC the first time.
Why a sworn translation, if it is already in English
Here is the part that surprises people. Your HMRC certificate arrives in clear, official English. Why translate it?
Because Spanish administrations work in Spanish. A document in English, however authoritative, is not something the Agencia Tributaria is obliged to read or accept as it stands. What Spain requires is a sworn translation (traducción jurada) into Spanish, produced by a traductor habilitado por el MAEC — a translator authorised by the Spanish Ministry of Foreign Affairs. That translation carries the translator's stamp and signature and has official standing. A courtesy translation, an in-house version, or your own rendering will not do the job.
If you are unsure whether the professional you are using holds that authorisation, you can check it against the official register — we explain how in verify a sworn translator authorised by the MAEC.
Apostille: usually not the issue here
For many foreign public documents, Spain also expects a Hague Apostille to confirm the signature is genuine. A tax residence certificate is a slightly different animal — it is an administrative document, and in practice HMRC certificates presented under a tax treaty are often accepted without one, since the treaty framework itself governs their exchange. Still, requirements differ by office, so if you are unsure whether an apostille will be asked for, it helps to understand how the apostille and the sworn translation fit together before you submit.
The order that saves you a second round
- Request the Certificate of Residence from HMRC, for Spain and for the period you need.
- Check the Spanish requirement — certificate alone, or with a specific treaty form.
- Sworn translation into Spanish by a MAEC-authorised translator, apostille included if one was affixed.
- Submit to the Agencia Tributaria or to the paying entity.
Reverse two of those and the file tends to come back.
Where Textualia fits
The sworn translation is our part. And it lines up neatly: Textualia works English → Spanish every day, which is exactly the pair an HMRC certificate needs. Your document already arrives in English; we turn it into a Spanish sworn translation carrying the MAEC-authorised stamp the Agencia Tributaria expects, delivered as a digitally signed PDF, with an optional physical copy if your office still prefers paper.
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