How to make an invoice: a step-by-step guide
How to make an invoice step by step: what to include, how to number it, which payment terms to use, how to send it and follow up, and the mistakes to avoid.
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Guides to invoicing and getting paid, and news from KeenInvoice. For a list of every change to the site, see the changelog.
Invoice number: how to number your invoices
What an invoice number is, why it must be unique and sequential, common formats like INV-0001, and how to handle voided invoices, gaps and multiple series.
Introducing KeenInvoice: a free, private invoice generator
Why we built KeenInvoice, a free invoice generator with no sign-up or watermark that keeps your documents in your browser, and what this blog will cover.
Invoice vs receipt: what’s the difference?
Invoice vs receipt explained: an invoice asks for payment, a receipt proves it was made. A side-by-side table, the timeline of a sale, and when you need each.
Net 30 meaning: payment terms and how to calculate the due date
Net 30 means payment is due 30 days after the invoice date. How to work out the due date, other terms like Net 60 and 2/10 Net 30, and how to use them.
Proforma invoice: what it is and when to use one
A proforma invoice is a preliminary bill sent before goods ship or work starts. When to use one, what to include, and how it differs from a quote.
What is an invoice? Meaning, definition and examples
Invoice meaning in plain English: what an invoice is, what it’s for, what goes on one, the main types, and an example invoice you can follow.