To set VAT on an invoice:

1. Edit or create an invoice

2. For each line item, set the VAT rate (e.g. 21%, 9%, 0%)
3. The system calculates VAT automatically
4. VAT totals appear in the invoice summary

New invoice lines default to your standard VAT rate. To change that default, go to Settings → "BTW" and update the default rate. The rate is always 0% when the invoice uses the VAT reverse charge toggle.

MyCompanyDesk accepts the current Dutch rates 0%, 9% and 21% (sources/vat-rates.yaml#countries.NL.zero/reduced/standard).

Tip: Invoicing a business customer in the EU? Use the "VAT Reverse Charge (BTW verlegd)" toggle instead of picking 0% yourself.