Form 303: the VAT self-assessment

Who has to file it

Everyone carrying out a business or professional activity subject to VAT in Spain: self-employed people, companies and also non-residents with a permanent establishment. If you are registered in the census with a taxable activity, the form is filed even if the quarter was zero.

That last part surprises many people: a quarter with no invoicing does not exempt you from filing. It is filed as no activity, but it is filed.

How it is filed

Online only. The Tax Agency accepts an electronic certificate and, for individuals not obliged to use one, Cl@ve too. Obliged entities file with a recognised certificate.

The AEAT help service first opens a VAT census window where you see your VAT and income tax situation for that period, and from there you continue with filing. If there is an amount to pay, you can pay by direct debit giving the IBAN or choose other options.

If you have no certificate, start there: how to get a digital certificate.

What is declared in it

The underlying rules, which transactions are taxable, which rates apply and which VAT is deductible, are in Law 37/1992 on Value Added Tax. It is amended often, so for specific figures always go to the consolidated text.

The mistakes that cost money

1. Not filing a zero quarter. The obligation exists even with no invoicing.
2. Deducting VAT on unrelated expenses. A personal expense does not stop being one because it has an invoice.
3. Losing purchase invoices. Without a complete invoice there is no deduction, however real the payment.
4. Confusing the accrual rule. VAT is declared when it accrues, not when it is collected, unless you are under a special scheme.
5. Filing late. It generates surcharges that grow with the delay.

The filing calendar is published by the Tax Agency each year. Check it in its electronic office rather than trusting memorised dates: it is one of the things that gets adjusted.

Relationship with registering as self-employed

Before the first 303 comes census registration with form 036 or 037, where you declare your activity and which VAT obligations apply. That registration determines whether you file quarterly and under which scheme. See Tax Agency appointment.

Result to refund or to carry forward: not the same

When input VAT exceeds VAT charged, the form comes out negative and there are two paths:

• Carry forward: the balance rolls into the following quarters and is deducted from what comes out to pay. It is the norm in the first three quarters.
• Refund: it can only be requested in the last self-assessment of the year, the fourth quarter, unless you are in the monthly refund register.

Ticking «refund» in a quarter where it does not apply is one of the errors that generates the most requests, and it delays payment by months.

Schemes that change the form completely

Equivalence surcharge: individual retailers under this scheme do not file form 303 for their retail activity. They pay the surcharge to the supplier and do not deduct. Filing the form while under the surcharge is a common mistake of those who register without advice.

Pro rata: if you carry out both transactions with a right to deduct and exempt transactions without it, you cannot deduct all input VAT. General or special pro rata applies and there is an adjustment at year end. It is the typical situation of someone combining exempt training with taxable consultancy.

Cash accounting: a voluntary scheme deferring accrual to collection, with its own mechanics and turnover limits.