By country
United StatesWhat a US small business invoice should include, with a real sample layout. Make your own free: 5 documents every month, no card needed.
CanadaWhat a Canadian invoice needs: GST, HST, PST or QST, your GST/HST number and more, with a sample. Make one free, 5 documents a month.
United Arab EmiratesWhat a UAE tax invoice shows: VAT 5%, your TRN and more, in English and Arabic, with a sample. Make one free, 5 documents a month.
This page is information, not legal or tax advice. Rules differ by country, state and province, so check yours with your tax agency or accountant.