How to Write an Invoice (With Examples)

What every invoice needs

A professional invoice includes an invoice number, issue date, due date, your business details, the client's details, an itemized list of goods or services with quantities and prices, subtotal, tax, and total due. Missing any of these can delay payment.

Choosing an invoice number system

Use a consistent, sequential numbering scheme (e.g. INV-0001, INV-0002) so you can track payments and avoid duplicates. JustDraftIt generates a unique number automatically for every invoice.

Setting clear payment terms

State your due date explicitly (e.g. 'Net 15' or a fixed date) and your accepted payment methods. Clear terms reduce late payments.

Common invoicing mistakes to avoid

The most common mistakes are forgetting to add tax, using inconsistent invoice numbers, and not specifying a due date. Using a generator with built-in calculations avoids all three.