Invoice vs bill:
same thing?

People use "invoice" and "bill" as if they were different things, and in conversation they sometimes are. On paper, though, a bill and an invoice are usually the same document seen from opposite sides of a sale. GOV.UK's own guidance describes an invoice as a "bill". The distinction worth understanding is not between two documents but between the two sides of your books.

The two words in practice

Invoices you send: accounts receivable

When you invoice a customer, the amount becomes money owed to you until they pay. Together, your unpaid invoices are your accounts receivable. Keeping them under control is the heart of getting paid: send promptly, state a due date, and chase on time. The guides on how to write an invoice and how to chase an unpaid invoice cover both ends.

Bills you receive: accounts payable

When a supplier invoices you, that bill is money you owe until you pay it. Your unpaid supplier bills are your accounts payable. Managing them well means checking each bill against what you ordered, paying on time to keep suppliers on side, and keeping every bill as evidence of your business costs. If you are VAT registered, check the bill is a proper VAT invoice before you reclaim the VAT on it.

Handling the bills you receive, step by step

A simple routine keeps supplier bills under control, however few you get:

1. Check it. Does the bill match what you ordered and received, at the agreed price? Is the arithmetic right?
2. Check the paperwork. Does it carry the supplier's details, a number and a date? If you are VAT registered and will reclaim VAT, is it a valid VAT invoice with the supplier's VAT number?
3. Record it. Enter it in your records as a cost, with its due date.
4. Pay it on time. Paying suppliers when agreed keeps good terms available to you, and business suppliers can charge you statutory interest if you pay late.
5. File it. Keep the bill with a note of when and how you paid.

That last step matters at tax time: every expense you claim needs evidence, and for VAT reclaims the evidence must be a VAT invoice.

Handling the invoices you send

The seller's routine mirrors it: write the invoice with every required detail, send it the day the work is done, record it as income owed to you, check for payment on the due date, chase if needed, and record the payment when it arrives. A monthly look at which invoices are still unpaid shows who needs chasing and how much cash is tied up. The late payment interest calculator shows what a late business customer owes you on top of the invoice.

Why the two sides should match

Every invoice you send is somebody's bill, and every bill you receive was somebody's invoice. When the two records match, payments are quick and disputes rare. When they do not, because a number was reused, a figure edited after sending, or a credit note never issued, both sides spend time reconciling. That is why the rules about unique numbers and correcting with credit notes exist; see how to correct an invoice.

Where "bill" means something different

There are a few settings where "bill" is used for something other than an ordinary invoice:

• Hospitality. A restaurant or bar bill is presented before payment and becomes a receipt once paid. For a VAT-registered diner, a simplified VAT invoice for £250 or less, or a full VAT invoice on request, supports the VAT reclaim.
• Utilities and subscriptions. Energy, phone and broadband bills are invoices by another name, usually issued on a regular cycle and often paid by direct debit.
• Bill of quantities, bill of lading, bill of exchange. These are specialist documents in construction, shipping and finance, not invoices at all.

What matters: the content, not the name

Whether you call it an invoice or a bill, a document asking for payment should carry the details GOV.UK lists for every invoice: a unique number, your details, the customer's details, a description, the supply date, the invoice date, the amounts, any VAT and the total. A VAT invoice needs more, and the guide on what a UK invoice must include sets out both lists. Calling your invoice a "bill" does not change what it must say, and calling a document an "invoice" does not make it one if the details are missing.

In business-to-business work, "invoice" is the clearer word. An accounts team files an "invoice" as a demand for payment; a document headed "bill" may be queried. Head your documents "Invoice", number them in sequence with the invoice number generator, and give each a due date from the invoice due date calculator.

How accounting software uses the words

Most small business accounting and invoicing software follows the buyer and seller split. "Invoices" live in the sales side: you create them, send them and mark them paid. "Bills" live in the purchases side: you enter or upload them, schedule them and mark them paid. Reports then show your receivables, what customers owe you, and your payables, what you owe suppliers, as two separate lists. If you move between tools that use the words differently, the thing to check is which side of the books a document is on, not what it is called.

Bills, invoices and your tax return

On your tax return, invoices you sent make up your income and bills you received make up your allowable expenses, as long as the costs are wholly and exclusively for the business. Under the cash basis, both count when the money moves: when a customer pays your invoice and when you pay a supplier's bill. Under accruals, both count when the sale or the cost happens, whether or not it has been paid. Either way, the documents are your evidence, which is why both kinds belong in your records.

Bills and e-invoicing

From April 2029, every VAT invoice will have to be issued as an e-invoice, structured data that goes straight from the seller's system into the buyer's. For VAT-registered businesses, that means the invoices you send and the bills you receive from other VAT-registered businesses will arrive in the same machine-readable form, with far less typing on either side. The e-invoicing hub tracks what the government has confirmed so far.

Related terms

The guide on invoice vs receipt explains the difference between asking for payment and confirming it.

A worked example

A mobile mechanic invoices a delivery firm £640 for servicing two vans. To the mechanic, it is an invoice: INV-0088, money receivable, due in 14 days. To the delivery firm's bookkeeper, it is a bill: entered into their accounting software as a supplier bill, scheduled for the next payment run, and filed as evidence of a business cost. The document is the same; each business files it on its own side of the books. When the firm pays, the mechanic records the payment against INV-0088, and the firm records the bill as paid.

Common questions

Should I head my documents "invoice" or "bill"? "Invoice", especially for business customers. It is the word accounts teams and software expect.

Is a bill legally different from an invoice? Not in ordinary use. What the law cares about is the content, and for VAT, whether it is a valid VAT invoice.

Are bills from suppliers part of my records? Yes. Keep them as evidence of your expenses, for at least 5 years after the 31 January filing deadline as a sole trader, or 6 years for VAT; see how long to keep invoices.

How do I work out the VAT on a bill? If the bill shows a VAT-inclusive total, the VAT calculator takes the VAT out. Only reclaim it if the bill is a valid VAT invoice and you are VAT registered.

Invoice or bill, the name matters far less than the content. Get the details right, number it properly, and file it on the correct side of your books.