Modelo 303: the Spanish quarterly VAT return, explained

What exactly is modelo 303

Modelo 303 is a self-assessment form. You compute the difference between IVA repercutido (output VAT, the tax you add to your sales invoices) and IVA soportado deducible (input VAT, the deductible tax you pay on business expenses). The difference is what you pay to the tax office, or what the tax office owes you.

The tax itself is regulated by Law 37/1992 on IVA. You act as a collector: the IVA you charge your clients is never your income; you hold it until you report it, casilla by casilla (box by box), in the 303.

Who must file it

As a general rule, modelo 303 is filed by:

• Autónomos (self-employed workers) with an activity subject to IVA in Spain, whatever their nationality.
• Companies, such as an SL, with activity subject to IVA.
• Foreigners with activity in Spain: if you registered as autónomo or set up a company here, the 303 applies from your first quarter, even if all your clients are abroad.
• Landlords renting out premises and other lettings subject to IVA.

There are exceptions: for example, someone who performs only IVA exempt activities, or who is taxed under certain special regimes, may not have to file. When in doubt, check the official modelo 303 page or ask a professional.

Deadlines: the quarterly IVA calendar

IVA works in natural quarters and each quarter has its own filing window:

• First quarter (January to March): from 1 to 20 April.
• Second quarter (April to June): from 1 to 20 July.
• Third quarter (July to September): from 1 to 20 October.
• Fourth quarter (October to December): from 1 to 30 January of the following year.

Two important details. If you pay by direct debit (domiciliación), the window is shorter: up to the 15th in the first three quarters and up to 25 January for the fourth. And if the last day is a non-working day, the deadline moves to the next working day. Large companies and businesses registered for monthly refunds file every month instead of every quarter. You can check the details on the official AEAT deadlines page.

The three possible outcomes

Once the form is complete, the result can only be one of these:

• A ingresar (to pay): you charged more IVA than you paid, and you pay the difference by direct debit or through your bank.
• A compensar (to carry forward): the result is negative and you offset it against the following quarters. The law gives you four years to use that credit.
• A devolver (refund): instead of carrying the balance forward, you ask for the money back. As a general rule this option is exercised in the last return of the year, the fourth quarter one, and the AEAT reviews the request before paying.

Common mistakes when you come from abroad

These are the errors that cost newcomers the most:

• Invoicing EU businesses without IVA and not reporting it: under the reverse charge rule (inversión del sujeto pasivo) the invoice carries no Spanish IVA, but the operation must still be reported in the 303 and in the informative modelo 349, and you first need to register in the ROI, the register of intra-EU operators.
• Skipping quarters with zero activity: even if you did not issue a single invoice, you still file the 303 and tick the no activity box.
• Filing late: if you correct it before the tax office contacts you, the surcharge is 1% plus an extra 1% for each full month of delay, and after 12 months it becomes 15% plus late interest, under article 27 of the General Tax Law. If the AEAT sends a demand first, you face penalties instead.
• Assuming someone files for you: always confirm with your gestor (accountant) who files each form and when.

Modelo 390 and the VAT record books

The 303 does not travel alone. Every January, from the 1st to the 30th, most quarterly filers also submit modelo 390, the annual informative IVA summary: nothing is paid with it, but it recaps all the returns of the year and must match them.

Not everyone files it: businesses under the SII system of immediate electronic reporting are exempt, and so are certain quarterly filers whose only activities fall under the simplified regime or urban property rental; in exchange, they complete extra casillas in the 303 of the last quarter.

Behind everything sit the libros registro, the record books of issued and received invoices: every box of the 303 must be traceable to them if the AEAT asks.

How modelo 303 is filed

Filing is electronic, at the AEAT electronic office, identifying yourself with a digital certificate or, for individuals, with Cl@ve, the Spanish public identification system. The AEAT site offers the Pre303 help service to fill in the form. Another common option is having a gestor or authorised agent file on your behalf.

If you keep your invoices and expenses in kontora, the app generates the 303 draft casilla by casilla and guides you through filing it at the AEAT, or a partner gestoría files it; the final submission, today, is not done by the app for you.

Frequently asked questions

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