To delete your account:

1. Download your data first at Settings ("Instellingen") → "Gegevens downloaden" if you want to keep a copy
2. Go to Settings → "Account opzeggen"
3. Under "Account definitief verwijderen" (permanently delete account), click "Delete"
4. Confirm with your current password. This action is permanent

The same page also lets you cancel only your paid subscription. You then stop paying, but your account and data stay, since Dutch tax rules require you to keep your records for 7 years. Deleting your account removes your account and all your data for good.

Important: account deletion cannot be undone. Export everything you need before you proceed.