Invoice Generator

What this tool is used for

• Producing a one-off invoice without setting up accounting software.
• Creating a printable invoice for a freelance job.
• Producing a document with line items, totals and tax laid out correctly.
• Making an invoice you can save as a PDF from the print dialogue.
• Producing a consistent format across several clients.

Frequently Asked Questions

What has to appear on a valid invoice?

A unique invoice number, the issue date, both parties' names and addresses, a description of what was supplied, the amount due, and the payment terms. VAT or sales-tax jurisdictions add their own required fields — a VAT number and a rate breakdown in the EU, for instance.

How should invoice numbers be assigned?

Sequentially, with no gaps. Most tax authorities require the sequence to be unbroken and auditable, so deleting a cancelled invoice is the wrong move — issue a credit note against it instead. A prefix per year or per client is fine as long as each sequence itself is complete.

What do payment terms like Net 30 mean?

Payment is due 30 days from the invoice date. Shorter terms get paid sooner on average, and stating a late-payment interest rate is worth doing — in the UK and EU statutory interest applies whether or not you mention it, but naming it changes behaviour more than relying on it does.

How is tax calculated on the total?

Per line where rates differ, then summed — not by applying one rate to the grand total, which gives a different answer as soon as two items are taxed differently. Rounding is per line in most jurisdictions, and the difference between rounding early and late is exactly the kind of penny discrepancy an auditor notices.

Is my invoice data stored anywhere?

No — everything is computed in your browser and nothing is transmitted. That matters for an invoice specifically, since it contains client names, addresses and amounts that are commercially sensitive and, in the EU, personal data belonging to a third party.

Common errors and gotchas

• Omitting a unique invoice number, which makes reconciliation and audit trails impossible.
• Leaving out the tax registration details your jurisdiction requires on an invoice.
• Rounding per line and per total inconsistently, which produces a penny discrepancy against a payment.
• Forgetting payment terms and a due date, which is the most common cause of a late payment.
• Losing the record, since nothing is stored — the generated document is the only copy.