GLOSSARY

Form 303

Form 303 is the periodic value added tax (VAT) return that self-employed individuals and companies in Spain must submit to inform the Tax Agency of the output VAT charged and input VAT incurred, thereby determining the amount to be paid, offset or claimed as a refund. 

Form 303 is the official document used to declare output VAT (charged to customers) and input VAT (paid on purchases and expenses) during a specific period. Its purpose is to calculate the difference between the two and determine the taxpayer’s tax liability to the Spanish Tax Agency. 

The calculation is carried out as follows: 

  1. All invoices issued with VAT (output VAT) are totalled, applying the different rates in force in Spain (standard rate of 21%, reduced rate of 10% and super-reduced rate of 4%). 
  2. All invoices received showing VAT paid on purchases and expenses (deductible input VAT) are added together. 
  3. Input VAT is subtracted from output VAT:  
     
    • If the result is positive, the amount must be paid to the tax authorities. 
    • If the result is negative, it can be carried forward to subsequent periods or a refund can be claimed in the final return of the calendar year. 

Form 303 must be submitted by:

  • Self-employed individuals and businesses engaged in business activities subject to VAT.
  • Professionals and business owners who issue invoices with VAT (except where exempt).
  • Non-profit organisations and other entities engaged in economic activities subject to VAT.
  • Taxpayers registered with the Monthly VAT Refund Register (REDEME).
  • Businesses making intra-Community acquisitions of goods or services.

 

The frequency of filing varies depending on the type of taxpayer:

  • Quarterly filing (general scheme): Most taxpayers submit the return at this frequency, subject to the following deadlines:
     
    • First quarter (January-March): 1 - 20 April.
    • Second quarter (April-June): 1 - 20 July.
    • Third quarter (July-September): 1 - 20 October.
    • Fourth quarter (October-December): 1 - 30 January.
  • Monthly filing: Compulsory for companies registered with REDEME or that have an annual turnover exceeding €6 million. In these cases, the deadline is from the 1st to the 30th of the month following the reporting period (except for the December period, for which the deadline is 30 January).

It is important to note that it is compulsory to submit Form 303 even if there has been no business activity during the period; in such cases, a “nil return” must be submitted. Failure to file or late filing may result in financial penalties ranging from late filing surcharges (if no formal notice has been issued) to fixed or proportional fines depending on the seriousness of the offence.

The return is filed online via the Tax Agency’s Electronic Portal, using an electronic certificate, a Cl@ve PIN or a reference number. This form has been amended on several occasions to comply with European regulations and to assist in the fight against tax fraud.

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