Key dates and common mistakes

Disclaimer: We’ve written this as a practical overview for international residents, but every situation is different (especially if you have income or assets abroad). Please treat it as orientative and confirm your specific case with the AEAT and/or a qualified tax advisor.

If you live in Sant Cugat long enough, “doing the Renta” becomes a spring ritual (just like calçots, but with much more paperwork). The good news: for many people it’s fairly straightforward. The bad news: the draft document (“borrador”) is not a mind reader. International residents are especially likely to have missing info (foreign income, overseas accounts, cross-border deductions etc…), so a calm, methodical approach can save you money as well as stress. You might be liable for other declarations. Best to check with your gestor.

1. Know the calendar (Renta 2025, filed in 2026)

• Online (Renta WEB): 8th Apr – 30th Jun.
• Phone help: 6th May – 30th Jun (book from 29th Apr)
• In-person help: 1st Jun – 30th Jun (book from 29th May)
• If you pay by direct debit, the deadline is 25th Jun.

2. Your first question: are you a Spanish tax resident?

This guide focusses on tax residents. Typically, people who spend over half the year (183+ days) in Spain, or whose main base of life is here. If you’re not, you’re usually in a different system (non-resident tax). If you’re unsure, especially if you moved mid-year, this is where a gestor can pay for themselves.

3. Do you have to do it?

The rules about whether you need to do your Renta are full of exceptions, but the common ones are:

• Employment income over 22,000€, unless you received over 1,500€ in total from additional employer(s) in which case the threshold is 14,000€. E.g. 10,000€ from one employer and 5,000€ from another means you have to file.
• Some types of investment income have a combined limit of 1,600€.
• Other income like imputed property income, public aids, etc. have a combined limit of 1,000€.

Even if you’re not obliged, filing can be worth it if you expect a refund.

4. Before you log in: collect your “international” pile

International residents often miss refunds because the draft doesn’t automatically pull everything in. Try to get together:

• NIE/NIF details and current address (make sure AEAT has your correct details).
• Salary certificates (Spanish employer) and withholding info.
• Foreign income documents: overseas payments, dividends, interest, rental income, pensions, stock sales – whatever applies.
• Mortgage/rent documents. Landlord ID info.
• Donation certificates, union fees, pension contributions, childcare, etc.

If you own property abroad or have complex investments: consider professional advice (the reporting can be separate from the Renta itself).

5. Log in to Renta WEB (and don’t panic)

You can access Renta WEB with Cl@ve, a digital certificate, or a reference number.

Tip: Start by checking your “datos fiscales” (tax data) before confirming anything.

6. The golden rule: the borrador is a draft, not a verdict

Many people click “confirm” because the number looks plausible. That’s exactly how you easily lose money. Review and validate, because the draft is only as good as the data AEAT already has.

7. The 10-minute checklist (especially for internationals)

Work through these screens slowly:

1. Personal and family details: marital status, children/dependants, address changes.
2. Residency & double-tax logic: if you have foreign income, check it’s correctly included and whether any double taxation relief applies (often relevant for cross-border salary/dividends).
3. All income sources: Spanish salary is usually prefilled; foreign income isn’t.
4. Property: rented out? Empty property with imputed income? Changes of ownership?
5. Deductions: national + regional (Catalonia).
6. Individual vs joint filing for couples: sometimes one is clearly better-simulate both if relevant.

8. Catalonia deductions worth knowing

Catalonia has its own deductions on the regional portion. Two that commonly get overlooked:

• Renting your home: a deduction of 10% of rent paid, up to 500€ (1,000€ joint) if you meet conditions (≤35, unemployed ≥183 days, disability ≥65%, or widowed 65+) and income limits. You must include the landlord’s NIF (or foreign tax ID).
• Birth/adoption: 150€ per parent in individual filing (or 300€ joint), and single-parent cases are treated differently.

There are more, but these are the ones that pop up most often for Sant Cugat residents.

9. Common mistakes and how to avoid them

• Accepting the draft without checking: use “validate,” read the warnings, and confirm the underlying data.
• Forgetting “small” income streams: side gigs, rentals, foreign interest, investment sales. Make a list and tick them off. A tax-free investment vehicle abroad might not be the same here.
• Missing deductions: rent deductions, donations, family-related items – review systematically.
• Not fixing errors after filing: if you spot a mistake later, it can often be corrected by modifying the return – don’t just hope nobody notices.

10. When to call in help

If you have multiple countries, self-employment, stock/crypto activity, foreign property, or you arrived/left mid-year, getting advice can prevent expensive “oops” moments. For everyone else: take it step-by-step, and you’ll likely be fine.

So don’t put it off. It takes longer than you think. You also might need to visit a tax office to get the relevant digital certificates to be able to file online and these appointments take time to obtain. You might need to write to your landlord for their NIF or overseas bank for information. If you are a UK resident here with UK income, it is complicated as the UK tax return and payments are for each year ending 5th April and Spanish is a calendar year. If you are worried, ask a Gestor to help, but ask early, as they are very busy this time of year and some refuse to take more clients on.