Numbering that scales
Start with a year prefix (2026-001). Keep one sequence per legal entity, never reset mid-year, and never reuse a number — auditors and VAT checks look for gaps and duplicates.
Tax done right
If you charge sales tax or VAT, decide: per line (needed for mixed-rate baskets) or on the subtotal (fine when everything is one rate). The generator computes both — set the tax rate and check the totals block.
Getting paid faster
Put payment instructions on the invoice itself: account name, bank, reference = invoice number. Invoices with a clear payment reference get misallocated less and match payments faster.
Frequently Asked Questions
Can I use this instead of accounting software?
For simple billing, yes — keep a folder of PDFs and a running number. The moment you need VAT returns or inventory, move to real bookkeeping.
What if a client pays late?
Resend the same invoice marked 'Overdue — reminder 1' with the original number and date. Keep the number identical so it matches their records.