Form 303 is Spain’s periodic VAT return: subtract deductible input VAT from the output VAT charged on sales. It is filed from 1 to 20 April, July and October, and from 1 to 30 January for the fourth quarter. A negative result is normally carried forward to later periods; in the fourth quarter, a refund may be requested instead.
The VAT you charge is not yours: you collect it on behalf of the tax agency. Form 303 is the quarterly filing where you settle up: you compare the VAT you have charged with the VAT you have paid, and pay (or carry forward) the difference.
The mechanics: output minus input
- Output VAT: what you add to your sales invoices. Invoice €6,000 at 21 % and you charge €1,260.
- Deductible input VAT: what you pay on purchases tied to your activity. Spend €1,500 at 21 % and you bear €315.
- Result: output − input. In the example, €945 payable.
Try your own numbers in the quarterly VAT calculator.
To turn the estimate into a real cash reserve, see how much to set aside for Spanish taxes by combining forecast VAT with the estimated form 130 payment.
Spanish VAT rates
| Rate | % | Typical examples |
|---|---|---|
| Standard | 21 % | Most goods and services (including professional services). |
| Reduced | 10 % | Hospitality, passenger transport, certain foods. |
| Super-reduced | 4 % | Staple foods, books, medicines. |
| Exempt | 0 % | Regulated education, healthcare, insurance. |
Mind exempt activities: if yours is exempt (e.g. regulated education), you do not charge VAT — but in general you cannot deduct the VAT you bear either (or only a share, via pro-rata).
When it is filed
From the 1st to the 20th of April, July and October (quarters 1–3) and from the 1st to the 30th of January for the fourth quarter, in the same window as the annual summary (form 390) for those required to file it. Weekends and holidays push the deadline to the next working day, and direct debit shortens it by a few days. All dates live in the tax calendar.
What if it is negative?
If you bore more VAT than you charged (slow quarter, big investment), the result is carried forward to the following quarters. In the fourth quarter you may request a refund instead of carrying it forward.
Common mistakes
- Spending collected VAT as if it were income (set it aside: it is not yours).
- Deducting VAT on personal expenses or without a full invoice.
- Forgetting the fourth quarter is due 30 January, not the 20th.
- Skipping a "zero" quarter when there was no activity (the obligation remains).
Frequently asked questions
Is form 303 monthly or quarterly?
For a regular freelancer it is quarterly: four filings a year. Switching to monthly periods is set out exhaustively in the regulation and covers few cases: joining REDEME (the monthly refund register); exceeding a volume of operations of €6,010,121.04 in the previous year, what the tax agency calls a "large company"; acquiring a business as a going concern and crossing that figure between both parties; applying the special group-of-entities regime; or holding or withdrawing products from a fuel excise warehouse. REDEME is the only one you choose: you apply for it with form 036 and it commits you to filing monthly, filing online and keeping your VAT books through the SII real-time system. The rest are not applied for: once you meet the condition, monthly periods become mandatory and you simply report it to the tax register.
What is the fourth-quarter VAT filing and when is it due?
The fourth quarter covers October, November and December and is filed between 1 and 30 January of the following year, not by the 20th like the other three. It is also the quarter where, if the result is negative, you may request a refund instead of carrying the balance forward.
Does form 303 have an annual summary?
Yes: form 390, an informational return with no payment attached that summarises the four form 303 filings of the year and is submitted between 1 and 30 January, the same window as the fourth-quarter 303. Exemptions exist, but they are narrower than usually reported and you do not earn them by filling in the fourth-quarter breakdown: they only cover those who file quarterly, are taxed solely under common territory rules and work exclusively under the simplified VAT regime and/or urban property letting, plus those who keep their VAT books through the SII real-time system. Under the general regime you file the 390 all the same. And those who are exempt must complete the annual information section of the last 303 of the year; if that 303 is not filed, the exemption falls away.
Do I have to file form 303 if I invoiced nothing?
Yes. As long as you are registered for the obligation, a quarter with no activity is still filed as a zero or no-activity return. Skipping it is one of the most common reasons for a tax agency notice.
Does Aurio file form 303 for me?
No. Aurio works out output VAT and deductible input VAT from your transactions and invoices so you know what is coming, but it does not file anything with the Spanish tax agency and it is not a substitute for an accountant.
