How to invoice as a freelancer

An invoice from a freelancer is the same document as an invoice from a company. What differs is a handful of specific fields, one conversation that has to happen before the first one, and a couple of habits that only matter when there is nobody else doing your admin.

The general shape is covered in how to write an invoice. This is what changes when it is just you.

The conversation to have before the first invoice

Four questions, asked once, at the start — before there is any money at stake and while asking is still ordinary rather than awkward.

• "Which address should invoices go to?" The person who hired you is usually not the person who pays. In anything larger than a few people there is an accounts inbox, and an invoice sitting with your contact is waiting on them to remember to forward it.
• "Do you need a PO number or a reference on it?" In many companies an invoice without the purchase order it was raised against cannot be matched to anything and is rejected without being read.
• "What are your payment terms?" Theirs may not be yours. If they pay on 45 days and you wrote 14, you have not agreed anything — you have two numbers.
• "What is the exact legal name and address to bill?" Not the brand. An invoice made out to the wrong entity cannot be entered in their system or claimed against their tax.

Four sentences at the start save the most common month-long delay there is.

Whose name goes on it

This is the field freelancers get wrong most often, and it depends on how you are set up rather than on what you call yourself.

The rule underneath: the name on the invoice should match the name on the bank account you want paid into. A payment to "J. Smith" against an invoice from "Northlight Studio" gets held by anybody doing their job properly, and the query comes back to you a week later.

If you are a sole trader with no company and no tax registration, then you simply have no company number and no tax number, and the invoice has no line for either. Leaving a field blank looks like an omission; not having the field at all reads as an answer.

What you can leave off

Freelancers often copy a company's invoice and end up with fields they cannot fill. You do not need a logo, a registered office, a company number you do not have, a PO box, or a VAT line if you are not registered — though saying "not registered for VAT" once is better than a silent gap where a tax line should be.

What you cannot leave off is the same eight things anyone else needs: what an invoice must contain lists them, and the two that get invoices rejected are a unique number and the client's correct legal entity.

Numbering, when you are the only one issuing

The rules do not relax because there is one of you. Numbers must be unique and run in sequence with no gaps — in most countries that is law rather than convention, and a gap looks to an auditor exactly like a deleted invoice.

Two freelancer-specific traps. Do not restart each year unless the year is genuinely part of the number, or 2026-001 and 2027-001 are the same reference. And do not number by date — 20260827 stops being unique the day you send two. Invoice numbers has three schemes that work.

Starting at 001 on your first ever invoice tells a client they are your first client. Plenty of people start at 100 for exactly that reason, and it is not dishonest — the sequence only has to be unbroken, not to begin anywhere in particular.

Asking for money up front

For a new client or a large job, a deposit — a third or a half — is normal, and the request is not an invoice, because nothing has been supplied yet. It is a proforma invoice: it looks like a bill, states the amount and the terms, and creates no debt and no accounting entry.

Once it is paid, you issue the real invoice with a real number from your real sequence. Skipping that step is the most common paperwork mistake in freelance billing — money arrives, it feels finished, and there is now income with no invoice behind it that neither you nor the client can account for.

When to send it

The day the work is delivered, or on a fixed day each month for ongoing work. Both are better than "when I get round to it", for a reason that is not organisational: payment terms run from the invoice date, so an invoice sent two weeks late is paid two weeks later, and no amount of chasing recovers those two weeks.

If you bill monthly, pick a date and keep it. Clients build their own payment runs around when things arrive, and an invoice that turns up on the 3rd every month gets processed with less thought than one that appears whenever.

Chasing, without it feeling personal

This is the part freelancing makes harder, because there is no accounts department to hide behind — it is you asking someone you have a relationship with. The fix is to decide the schedule before you need it, so it stops being a decision made while annoyed.

Day one after due, day seven, day fourteen, day thirty, with the tone changing at each. How to send an invoice has all four written out to copy, along with what to do when the reply is "we already paid this" or "there is a problem with the invoice".

One thing worth knowing: in the UK and across the EU you are entitled to statutory interest on a late commercial invoice whether or not your contract mentions it. Most freelancers never charge it. It is still worth knowing, because a client's accounts department knows, and an invoice that mentions it moves up a payment run.

Keeping them

Keep every invoice you send, as a PDF, for as long as your tax authority requires — commonly five to seven years, counted from the end of the accounting period rather than the invoice date. Keep the ones you receive too.

The reason is rarely the client. It is a question years later about a year you have half forgotten, and the answer being findable in a minute rather than a weekend. Name the files so they sort: 2026-08-INV-014-Acme.pdf is still legible in 2031; invoice.pdf is not.

If you would rather not assemble any of this by hand, the free invoice generator writes, numbers and sends it from a sentence — and invoicing software for freelancers compares what the tools cost when three a month is not enough.