Purchases in the Dutch-speaking part of the Netherlands regarding vAT

I think you always have to submit a special vAT return, don't you? As a VAT-exempt person who receives an invoice from the Netherlands without VAT.

You also have to do a special vAT return quarterly. Just like the vAT returns themselves, I think. That has nothing to do with those advance payments, that's something else, that's for your personal income tax.

vAT declaration & special vAT declarations are always due on the 20th of the month next to the quarter. But I'm curious to hear from other :)

Yes, and what are the dates of the quarter?

The dates from the quarter, as in:

quarter 1: 1 January - 31 March -> submit 20/04

quarter 2: 1 April - 30 June -> submit 20/07</

quarter 3: 1 July - 30 September -> submit 20/10

quarter 4: 1 October - 31 December -> submit 20/01

Is that what you meant?

Thank you very much