What it does for you
The VAT works itself out
You pick 21%, 9% or 0% per line. The subtotal, the VAT per rate and the rounding happen automatically, including when one invoice carries several rates. That last part is exactly where manual work goes wrong: in the Netherlands you round VAT per rate over the summed subtotal, not per line.
If you work with reverse charge or under the small business scheme (KOR), factuurmaken adds the mandatory wording for you. You do not have to remember how it went.
Your numbering cannot break any more
Every invoice number follows on from the last one automatically. No duplicates, no gaps, not even when you create two invoices in quick succession. Coming from Word or Excel, you set the number you carry on from, so your sequence stays continuous.
You can see what is still outstanding
Invoices you send carry a status: sent, viewed, paid, overdue. If something sits there, factuurmaken sends a reminder in your own words. You do not have to remember it, and you do not have to write the awkward e-mail.
In focus: the VAT return at the end of the quarter
The moment your admin catches up with you is the return. Because every invoice is already built with the right rates, the overview per period is ready: what you invoiced, how much VAT belongs to it, broken down per rate.
You still file it yourself or through your bookkeeper, but you no longer have to reconstruct the numbers from a folder of PDFs.