This can have two causes:
- You requested your VAT ID (btw-ID) at the end of the quarter. In that case, it still sometimes happens that you have to file your first tax return by a physical letter. You receive the appropriate paperwork through the mail, and you send it back to the Tax Authorities (Belastingdienst) after completing it.
- The second possibility is that you are too early! Super that you want to be there on time, but you can only file your VAT (btw) return after the first day of the month following the previous quarter. For example: quarter 3 runs from July 1 - September 30. You can then file your tax return for this quarter from October 1 - 30.