303 Form 303: Quarterly Self-Assessment
This is the main form. All freelancers and companies (except special regimes) must file it every quarter to declare collected VAT and deduct paid VAT.
- 1st Quarter: April 1st to 20th.
- 2nd Quarter: July 1st to 20th.
- 3rd Quarter: October 1st to 20th.
- 4th Quarter: January 1st to 30th of the following year.