How to Create a Professional Invoice
An invoice is a demand for payment with enough information for the payer to act on it and for both sides to account for it. The Invoice Generator produces a printable one with itemised costs and tax.
What has to be on it
The word "invoice", which sounds trivial and is not - it distinguishes the document from a quote, an estimate or a receipt, and that distinction matters if the debt is ever disputed.
A unique invoice number, sequential and never reused. This is how both sides reference the document and how your accounts reconcile.
The invoice date and the date the work was done or goods supplied, which can differ.
Your name and address, and your company registration and tax number if you have them. The customer's name and address - and specifically the legal entity being billed, not the individual you dealt with.
A description of what is being charged for, itemised with quantity and unit price. The total, with tax shown as a separate line rather than folded in.
The payment terms and the due date. And how to pay - bank details, or a payment link.
Tax rules vary by country and by whether you are registered, so what your invoice must show legally is worth checking for your own jurisdiction rather than copying a template from elsewhere.
The two fields that actually affect payment speed
A due date rather than payment terms. "Net 30" requires the payer to work out a date, and anything requiring work gets postponed. "Due 14 November 2026" does not.
One obvious way to pay. An invoice offering four options with details scattered across it converts worse than one with a single clear method. If you can offer a payment link, it removes the step where someone has to type an account number.
Worth knowing what payment methods cost you: card and online processors take a percentage plus a fixed fee, and on small invoices the fixed fee dominates. The Payment Fee Calculator shows what you actually keep.
The practical things that get invoices paid
Send it to the person who pays, not the person who hired you - in larger organisations those are different people and an invoice sitting in the wrong inbox is not late, it is lost.
Include a purchase order number if they gave you one. In many companies an invoice without a PO cannot be processed at all, regardless of goodwill.
Invoice promptly. The correlation between sending late and being paid late is strong, partly because a stale invoice is harder for the payer to verify.
Keep a copy. Most jurisdictions require invoices to be retained for several years.
Common questions
Do I need to be a company to invoice?
No. A sole trader invoices under their own name, with the same required fields.
Should I charge late fees?
Only if the terms said so beforehand. Many jurisdictions also allow statutory interest on overdue commercial debt.
What if the client disputes a line?
Ask them to pay the undisputed part. Withholding an entire invoice over one line is common and rarely justified.
How do I price the work in the first place?
A different question - the Freelance Hourly Rate Calculator works back from an income goal.
Need an invoice now?