Sworn translation of tax returns and tax documents
A sworn translation of tax documents is the official translation of your income tax return, Agencia Tributaria certificates, withholding statements or annual accounts, signed and stamped by a sworn translator appointed by the MAEC. It is what you will be asked for whenever you need to prove your income or tax residence outside Spain — when applying for a mortgage, processing a visa or invoking a double taxation treaty. We translate into 39 languages, with a fixed quote before we start and guaranteed confidentiality.
Free, no-obligation quote · Last updated: August 2026
- Translators appointed by the MAEC
- Confidentiality guaranteed
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- Tax and accounting terminology
Why are you being asked for a sworn translation of your taxes?
It is hardly ever bureaucratic whim: there is an authority or an institution on the other side that needs to read your figures and trust them. These are the four scenarios we see most often. Pick yours and see which documents you are likely to be asked for.
Buying property or seeking finance abroad
The foreign bank does not know the Spanish tax system and will only approve the transaction if it can verify your income against official documents. As they are not in its language, it requires a sworn translation to add them to the credit-risk file.
- Income tax returns for the most recent tax years
- Withholding certificate or payslips
- Certificate of good standing with the Spanish tax authority
Visas, residence permits and family reunification
Consulates and immigration offices ask for proof of sufficient financial means. The income tax return is the strongest evidence there is, and it must be filed officially translated into the language of the destination country.
- Full IRPF return as proof of solvency
- Certificate of tax residence issued by the AEAT
- Often together with criminal record certificates and civil-status documents
Avoiding being taxed twice on the same income
If you live or work between two countries, double taxation treaties keep your income from being taxed twice — but each administration requires you to prove to it what you have already declared to the other, with officially translated documents.
- Certificate of tax residence for treaty purposes
- Proof of taxes paid in the other country
- Non-resident returns and withholding certificates
Corporate transactions, public tenders and audits
When your company bids for a public contract abroad, opens a subsidiary or goes through an international audit, its tax and accounting documentation forms part of the file and must be translated by a sworn translator.
- Corporate income tax and annual accounts
- VAT returns and statutory ledgers
- Certificates of good standing with the tax authority and Social Security
Tax documents we translate
Open each one to see what it includes and what the sworn translator pays attention to. If yours is not listed, send it anyway: most Agencia Tributaria documents follow the same translation logic.
Income tax return (IRPF)
The flagship document: it proves your annual income to banks, consulates and foreign administrations. It is translated in full, with every box, heading and the final assessment. The translator keeps the official Spanish nomenclature and adds the explanation the receiving body needs to understand what each item stands for.
Certificate of tax residence
Issued by the Agencia Tributaria, it certifies in which country you pay tax. It is the key piece for applying a double taxation treaty and avoiding paying twice on the same income. There are two variants — the general certificate and the one issued specifically «for treaty purposes» — and they are not always interchangeable: confirm which one you are being asked for before ordering the translation.
Corporate income tax and annual accounts
Balance sheet, income statement and notes, together with the tax assessment. They are requested by foreign parent companies, investors, auditors and tender committees. Here terminological precision is critical: one mistranslated accounting item changes how the figures read. If the foreign registry also requires the Spanish originals to be legalised, see our Hague Apostille page.
Withholding and payment-on-account certificates
The summary of what your payer has withheld over the tax year. Together with payslips, it is the proof of income foreign banks ask for when the tax return alone does not cover the full period or you have just changed jobs.
Non-resident returns and information filings
If you own property or earn income in Spain without living here — or the other way round — non-resident returns and the information filings on assets held abroad form part of the file both administrations review. They are translated with the same rigour as the income tax return, keeping the official designation of each form.
Demands, inspection reports and rulings
When proceedings are open with two administrations involved, demands, inspection reports and rulings must be filed in translation. These documents carry strict deadlines, so tell us your cut-off date when requesting a quote and we will schedule the job to arrive on time.
Your figures do not leave this office. An income tax return contains the most sensitive information a person or a company has: income, assets, family circumstances, accounts. Your documents are never passed to third parties and are used solely to prepare the quote and the translation. Only the project manager and the assigned sworn translator have access to them, the latter bound by the duty of confidentiality inherent in their official appointment.
How to order the sworn translation of your tax documents
No travel and no handing over originals: we work from the scanned document and you receive a translation with full legal validity.
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Send your documents
As a PDF or high-quality photo via the quotation form, by email or on WhatsApp, stating the target language and the country where you will file them.
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Receive your fixed quote
A fixed price per document and the deadline in writing. If you are working to a date — a signing, an appeal deadline — tell us and we factor it in.
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Your translation, ready to file
As a digitally signed PDF, valid on any electronic filing platform, and on paper by courier or collected in Adeje, Seville or Málaga.
Why a standard translation will not do. Tax administrations, banks and consulates only accept translations bearing the signature, stamp and accreditation number of a sworn translator appointed by the MAEC. In tax matters this weighs even more: one mistranslated figure or heading can change the meaning of an assessment. Translations into English are signed by our in-house translator, appointed by the MAEC.
Frequently asked questions about translating tax documents
How much does it cost to translate an income tax return?
It depends on the actual length of the document: a simple return runs to a few pages, while one with business activity or property gets considerably longer. The language and the complexity of the document also count, and you will always receive a fixed quote per document before deciding, with no obligation.
Does the whole return have to be translated, or is a summary enough?
The whole return. A sworn translation is by definition complete and faithful: it includes every page, box and annex of the document exactly as issued by the administration. A summary or extract has no official validity, and the receiving body will return it.
Do I also need the Hague Apostille?
Sometimes, yes. If the destination country requires proof that the Spanish document is authentic, it will have to be apostilled before translating — and the correct order is apostille first, translation second, so the apostille is translated too. We can handle both in a single order.
How do you guarantee the confidentiality of my tax data?
Your documents are never passed to third parties and are used only for the quote and the translation. Access is limited to the project manager and the assigned sworn translator, who is bound by the duty of confidentiality inherent in their official appointment.
Is it valid for applying a double taxation treaty?
Yes: that is precisely one of the most common uses. To invoke a treaty you usually need the certificate of tax residence and the proof of taxes paid, officially translated. Check with the Agencia Tributaria which type of certificate applies to you before ordering it.
How long does delivery take?
It depends on the volume: tax documents tend to be longer than a civil certificate, so the deadline is confirmed in writing in the quote once we see the actual pages. If you have a cut-off date, say so when ordering: we offer an urgent service.