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How to write an invoice – free invoice template (UK)

5-minute read

Businesswoman wearing glasses looking at paperwork with laptop
Sam Bromley

Sam Bromley

3 April 2023

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You’ve set up your business and sold goods or services to clients and customers, which means you need to send them an invoice. But how do you write an invoice?

Even if you’ve been running your business for a while, you might be wondering whether there’s more information you should include when you draft your invoices.

This guide includes a free self-employed invoice template, and an invoice template PDF for limited companies to help you manage your finances.

Download your free invoice templates

This article explains how to make an invoice, but what about getting an invoice example you can use straight away?

Below you'll find a pack of four invoice templates that you can use to create your own professional invoices. Our template pack includes an editable invoice template PDF each for limited companies and sole traders – both with and without VAT.


What is an invoice?

An invoice is a bill that businesses send to customers or clients, asking for payment for goods or services. Invoices usually include a description of the items you’re charging for along with payment terms, amongst other information.

Business invoicing is an important part of bookkeeping, as businesses need to keep information about sales and income for tax and accounting.

Invoices are different to receipts (which acknowledge payment) and purchase orders (which notify intent to buy goods and services).

How to write an invoice: step-by-step

Wondering what to include on an invoice? says that there’s certain information that your invoices must include – follow the steps below to get your invoices up and running in no time. And watch our video below for more on how to write an invoice.

1. Make your invoice look professional

The first step is to put your invoice together. You can do this yourself using a word processor or Excel, but you could also use one of our free invoice templates above.

There may even be sample templates on your word processor, depending on the program you’re using.

You should use professional fonts and styling that match your brand, then add your logo and colours if possible.

2. Clearly mark your invoice

Make sure your customers know it’s an invoice they’re receiving. Just adding the word invoice at the top of your document might make it more likely you’ll be paid on time, as it makes your request for payment stand out from other documents your client might get.

The guidelines on the website also state “you must clearly display the word ‘invoice’ on the document.”

Your invoice needs to have a unique identification number. This is for your records, as you should have a reference for all the invoices you’ve raised to make sure you don’t create duplicates.

You can use a sequence of numbers that gradually increases. You could also use letters in front of a number, which might indicate a specific client.

3. Add company name and information

This means both your company’s information and the details of the company you’re invoicing:

  • your company’s name, address, and contact details
  • your customer’s company name and address, including a contact’s name so it reaches the right person
  • your registered office address and company registration number if you’re a limited company, along with the formal registered name

Keep in mind that if you’re a limited company and you choose to add the names of your directors on the invoice, you need to add the names of all directors.

4. Write a description of the goods or services you’re charging for

These descriptions don’t need to be long, but they should be detailed enough for your customers to know what it is they’re paying for.

After all, if they have no idea what they’re being charged for, they’re more likely to query the invoice – leading to a delay in payment.

Once you’ve added a clear description of each item, you should add in the quantity of each and the price.

5. Don’t forget the dates

You need to add some dates to your invoice. These are:

  • the date you provided your goods or service (the supply date)
  • the date you create the invoice

You could add the supply date to the description of your goods or service, and add the invoice date at the top along with your name, address, and contact details.

6. Add up the money owed

As well as including the costs of individual goods or services, you need to put the total amount owed as well.

Plus, if you’ve agreed a discount with your customer, note this down on the invoice and subtract it from the total cost.

If applicable, include the VAT amount too.

7. Mention payment terms

You should have agreed payment terms with the customer beforehand, but it’s a good idea to note the terms of payment on the invoice as well.

So if you expect to be paid within a certain number of days, remind the customer by including it on the invoice.

More importantly, note down how exactly your customer should make the payment. It’s likely you’ll want the customer to make the payment directly to a bank account. If that’s the case, be sure to add your bank details.

Including clear payment terms – as well as making it easy for customers to pay you – should help with your business's cash flow, as it encourages quick payment.

If you’re looking for a bank, here are the best business bank accounts as voted for by businesses themselves.

Issuing VAT invoices says that you should use VAT invoices if you’re VAT registered. These invoices need more information on them than normal invoices.

There are different types of VAT invoices you can issue – a full invoice, a modified invoice for retail supplies over £250, and a simplified invoice for supplies under £250.

The information you need to include depends on the type of VAT invoice you’re issuing. There’s a handy table on the website that lets you know what information you should add depending on the invoice.

In general, though, they need the same information as normal invoices, plus:

  • your VAT registration number
  • the tax point (time of supply) if it’s different than the invoice date
  • the VAT rate and total VAT charged, if all the items are charged at the same rate
  • if different items have different VAT rates, then show this for each one

How to send an invoice

The quickest and easiest way to send your invoices is by email. You can attach your invoice in an un-editable PDF format (to prevent fraud) and include a clear, brief description of your business and invoice in the subject line and body of the email.

Different customers and clients might have different processes on receiving invoices. It might be a good idea to find out whether there’s certain information to include in the subject line that’ll help you get paid faster.

After you’ve sent an invoice, you could choose to give your customer a phone call to check they’ve received it – and if the payment isn’t forthcoming, you can politely nudge your customer.

Alternatively, there’s software that can take the hassle out of sending invoices. In some cases, you can create and send invoices directly from a mobile app – more on those below.

If a customer has multiple outstanding invoices, you might also choose to send a statement of account to help them keep track of what they owe (and pay you on time).

What about invoice software?

Above, we've provided a selection of free downloadable invoice templates that you can edit yourself. You can use these to take the stress out of creating your own invoices from scratch.

If you want to know how to make an invoice yourself, you can also have a look at our list of the best invoice apps for even more invoice template options.

Plus, some digital banks and mobile-only banks even offer an invoice generator to create and chase invoices for you, taking the hassle out of record keeping. Have a look at the best business challenger banks.

Do you have any more questions on how to write an invoice? Let us know in the comments below.

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Photograph: nenetus/
Sam Bromley

Written by

Sam Bromley

Sam has more than 10 years of experience in writing for financial services. He specialises in illuminating complicated topics, from IR35 to ISAs, and identifying emerging trends that audiences want to know about. Sam spent five years at Simply Business, where he was Senior Copywriter.

We create this content for general information purposes and it should not be taken as advice. Always take professional advice. Read our full disclaimer

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