Huismus works with and without the small business scheme (KOR). If you use the KOR, your invoices carry no VAT. If you do charge VAT, you choose the rate per line. Whether the KOR suits you is not something Huismus tells you: that's your call.
You set it up under Settings → KOR.
With the KOR
Turn on I use the KOR and fill in your KOR text. That text goes under every new invoice. Huismus doesn't suggest a text: you write it yourself. While the KOR is on, Huismus won't issue an invoice without it.
Every line then has 0% VAT.
The KOR limit
Under KOR limit, fill in the revenue amount you want to keep an eye on. The overview shows how much of it you've used this year. From the percentage you choose, you get a warning there. If a new invoice takes you past that percentage, Huismus already tells you when you issue it.
With VAT
Turn the KOR off. You then choose 0, 9 or 21% VAT per line. A new line starts at 21%. Fill in your VAT number under Settings → Business, and it goes on your invoices.
Under the invoice you see the VAT per rate, for example "21% VAT € 210.00", on screen and in the PDF.
Reverse charge
For a line where the VAT is reverse charged, choose reverse charge instead of a rate. The line counts as 0%, and the invoice says "reverse charge". Also fill in the Reverse charge text under Settings → KOR. It goes at the bottom of the invoice. Without that text, Huismus won't issue such an invoice.
If the customer has a VAT number in Huismus, it goes under their address on the invoice.
Revenue
Revenue in Huismus is always without VAT: on the overview, on the year overview and for the KOR limit. What's open and what's been paid includes VAT, because that's what your customer pays.
Costs and input VAT
Huismus always keeps an expense with the amount you paid.
With the KOR off, the year overview shows your costs excluding VAT, and the VAT on your expenses apart, as Input VAT. It goes per line: at 21%, 9% or 0% the VAT you filled in counts as input VAT and the rest as costs. With reverse charge, and on a line without a rate, the whole amount counts as costs. With the KOR on, you see the costs including VAT, as always.
VAT return
Under Reports → VAT return you see, per quarter, month or year, the revenue and VAT from your invoices and expenses, per box, and what you pay or get back. You copy the amounts into your return yourself; Huismus sends nothing.
Huismus counts issued invoices and credit notes on their invoice date, and expense lines with a VAT rate on the date of the receipt. A service to a business in another EU country (box 3b) counts on the delivery date, if you filled one in on the invoice. What it can't count is listed at the bottom under Not counted, with a link. There you fill it in or take it along yourself.
With Download CSV you get the same as a file for Excel or Numbers: the boxes, what you pay or get back, and what isn't counted. An AI assistant can read the report too. With the KOR on, the report has no amounts and there is no CSV.
You can also download an export for your accountant. See Exporting.
A credit note and a copy
A credit note keeps the rates of the invoice it credits. If you copy an invoice or convert a quote while the KOR is on, the new invoice starts at 0%.