Name the customer, list what you sold, done. Botsan works out the tax, the totals and the next invoice number, and gives you a link the customer can open and print. Then it tells you when they still have not paid.
invoice Acme Ltd with 18% tax
10 x Notebook @ 120
3 x Chair @ 850paid INV-2026-0007Sequential per year, reserved with a database lock, so two invoices raised in the same second can never be given the same number.
The tax line is labelled the way your country labels it, and handles both tax-added and tax-included pricing correctly.
Every invoice gets a private link the customer can open on a phone and print or save as a PDF. Nothing to download or install.
Record a payment and it appears in your money tracker automatically — one set of numbers, not two.