How to Invoice as a Sole Trader in the UK (2026 Guide)

Invoicing as a sole trader in the UK is simpler than it looks. There is no official form to use. GOV.UK lists what an invoice must show, HMRC adds a few details once you register for VAT, and the rest is habit: a clear number, a due date and a copy kept for your records.

This guide is the how-to: what to include with and without VAT, numbering, payment terms, late payment interest, the VAT threshold and record keeping, with a worked example in pounds. For a ready-made layout and HMRC's full list of VAT invoice fields, see our UK invoice template for sole traders.

Every rule below comes from GOV.UK and HMRC pages we read on 6 November 2026, listed at the end. This is general information, not tax or legal advice. Thresholds and rates change, so check the linked page, or ask an accountant, before you rely on a figure.

Do sole traders have to send invoices?

GOV.UK says you must give a customer an invoice by law when both of you are registered for VAT. Otherwise no law makes you send one, but you should: an invoice tells the customer what to pay and by when, and it is part of the sales records HMRC expects you to keep for your Self Assessment tax return.

You can start trading as a sole trader without registering, but you must register for Self Assessment if you earn more than £1,000 from self-employment in a tax year (6 April to 5 April).

What a sole trader invoice must include

GOV.UK lists these details for every invoice:

• a unique identification number
• your business name, address and contact details
• the name, or company name, and address of the customer
• a clear description of what you are charging for
• the date the goods or services were provided (the supply date)
• the date of the invoice
• the amounts charged
• the VAT amount, if VAT applies
• the total amount owed

Sole traders have two extra rules:

• Your own name, next to any business name. If you trade as "Fern Studio", the invoice still shows your own name. A sole trader's business name must not include "Limited" or "Ltd".
• An address for legal documents. If you use a business name, give an address where legal documents can be delivered to you.

If you are not VAT registered

Send an ordinary invoice and leave VAT off it. Only VAT-registered businesses can issue VAT invoices, and you have no VAT number to show. A short note such as "Not registered for VAT" saves the customer's bookkeeper a question. It is a courtesy, not a requirement.

If you are VAT registered

HMRC's VAT Notice 700/21 adds details on top of the GOV.UK list. The main ones:

• your VAT registration number
• a sequential number, from one or more series
• the time of supply (the tax point), and the date of issue when it differs
• for each line: the quantity or extent of the services, the unit price, the VAT rate and the amount excluding VAT
• the total excluding VAT and the total VAT, with the VAT in sterling even on an invoice in another currency
• the rate of any cash discount you offer

You normally issue a VAT invoice within 30 days of the supply. HMRC's full list, the shorter invoice allowed for £250 or less, and invoices mixing 20%, 5% and 0% lines are on our UK invoice template page.

How to number your invoices

GOV.UK asks for a unique number on every invoice, and HMRC asks VAT-registered businesses for a sequential number from one or more series. One running sequence covers both:

Pattern	Example	Good for
One running sequence	INV-0042	Most sole traders: simple, and gaps are easy to spot
Year, then sequence	2026-014	Seeing which year an invoice belongs to
A series per client	HP-007	Only if each series stays sequential and never overlaps

Never reuse a number, even for an invoice you cancelled. If an invoice you sent was wrong, ask your accountant whether to issue a credit note or a corrected invoice. And ask clients to quote the invoice number as their payment reference, so payments are easy to match.

How to invoice, step by step

1. Agree the price and payment terms before you start, in a short quote or email. See quote vs estimate.
2. Get the customer's exact name and address. For a company, use its full registered name.
3. Describe the work so that someone who was not in the room understands it.
4. Add the dates: invoice date, supply date when it differs, and the due date as a real date ("20 November 2026").
5. Show the amounts: quantity, rate and amount per line, VAT if you are registered, and the total owed.
6. Say how to pay: account name, sort code and account number, with the invoice number as reference.
7. Send a PDF and keep a copy for your records.

For line items by pricing model (hourly, day rate, fixed fee), see how to make an invoice as a freelancer.

Worked example: a sole trader invoice in pounds

Alex Morgan writes website copy as a sole trader under the name Fern Studio. She is not VAT registered. She delivers a job to Harbour & Pine Ltd on 3 November 2026 and invoices on 6 November, with 14 days to pay. All names, addresses and bank details are made up.

• From: Alex Morgan, trading as Fern Studio, 12 Example Road, Bristol BS0 0AA
• To: Harbour & Pine Ltd, 4 Quay Street, Leeds LS0 0AA
• Invoice: INV-0042, dated 6 November 2026
• Supply date: 3 November 2026. Due date: 20 November 2026

Description	Qty	Rate	Amount
Website copy, home page and four service pages	5 pages	£180.00	£900.00
Edits after your review	2 hours	£45.00	£90.00
Total due			£990.00

Notes: Not registered for VAT. Please pay by bank transfer to Alex Morgan, sort code 00-00-00, account 00000000, quoting INV-0042.

The same job once Alex is VAT registered. The invoice gains her VAT number, a rate on each line and a VAT total. GOV.UK says the standard rate of 20% covers most goods and services, and this example uses it (check the rate for your own work):

Description	Qty	Unit price	VAT rate	Amount excl. VAT
Website copy, home page and four service pages	5	£180.00	20%	£900.00
Edits after your review	2	£45.00	20%	£90.00
Total excluding VAT				£990.00
VAT at 20%				£198.00
Total due				£1,188.00

The client pays £1,188.00, and Alex accounts for the £198.00 of VAT on her VAT return.

Payment terms

GOV.UK lets you set your own payment terms, such as payment upfront or a discount for paying early. If you did not agree a payment date, the customer must pay within 30 days of getting your invoice or the goods or service.

With business customers, an agreed payment date must usually be within 60 days, or 30 days for public authorities. A longer period is possible between businesses if it is fair to both.

Agree the terms before the work, repeat them on the invoice, and write the due date as a date. For choosing terms, see invoice payment terms explained; for big jobs, deposit invoices.

Late payment interest from business customers

If another business pays you late, you can claim interest and a fixed sum towards your recovery costs, or choose not to. These rules cover business-to-business debts only, not private customers.

When a payment is late. Without an agreed date, the payment is late 30 days after the customer gets the invoice, or after you deliver if that is later.

Statutory interest is 8% a year plus the Bank of England base rate. You cannot claim it if your contract sets a different rate. GOV.UK's method:

1. Annual interest = amount owed × (8% + base rate).
2. Daily interest = annual interest ÷ 365.
3. Interest owed = daily interest × days late.

Example: Alex's £990.00 invoice is paid 30 days late, and say the base rate is 4% (check the Bank of England's current rate). At 12% a year, the interest is £118.80 a year, about 33p a day, so about £9.76 for 30 days.

Fixed compensation comes on top, once per late payment:

Amount owed	Fixed sum
Up to £999.99	£40
£1,000 to £9,999.99	£70
£10,000 or more	£100

You can also claim reasonable recovery costs. To add interest, GOV.UK says to send a new invoice.

Most freelancers chase politely first. Our payment reminder email templates and scripts for asking a client for payment cover those steps.

When you must register for VAT

You must register if your taxable turnover for the last 12 months goes over £90,000, or if you expect it to go over £90,000 in the next 30 days alone. The 12 months roll, so check every month, not once a tax year.

If you went over in the last 12 months, register within 30 days of the end of that month. Your registration starts on the first day of the second month after you went over: pass £90,000 on 15 July, register by 30 August, registered from 1 September. If you register late, you must pay VAT on sales since the date you should have registered.

Below £90,000, registering is your choice.

Customers outside the UK

HMRC's VAT Notice 741A explains where a service is supplied for VAT. For most services to a business customer (the "general rule" services), the place of supply is where the customer belongs. If that is outside the UK, you do not charge UK VAT, and your records should hold evidence of it. Some services follow special rules, and services to private individuals follow a different general rule, so check the notice for your case.

If you are not VAT registered, your invoice to a foreign client carries no VAT either way. You can invoice in euros or dollars; a VAT invoice in another currency still shows the VAT in sterling.

Keeping your records

You must keep records of your sales, income and business expenses, plus VAT records if you are registered. Sales invoices, bank statements and receipts are all proof.

• How long: at least 5 years after the 31 January submission deadline. For 2025 to 2026, filed by 31 January 2027, that is until at least the end of January 2032.
• VAT records: at least 6 years in general.
• Cash basis: the default method from 2024 to 2025. Income counts when the money arrives, so note the date each invoice is paid.
• Making Tax Digital for Income Tax: sole traders with qualifying income over £50,000 in 2024 to 2025 should have started from 6 April 2026. The threshold falls to £30,000 from 6 April 2027 and £20,000 from 6 April 2028, through software you choose and authorise.

For receipts, see expense and receipt tracking.

Invoicing as a sole trader in Ireland

Ireland's rules come from Revenue, not HMRC. The main differences:

• VAT registration thresholds: €42,500 a year if you supply only services, €85,000 if you supply goods.
• Not registered: don't issue an invoice showing VAT. If you do, Revenue says you are liable for the VAT shown and may face penalties.
• Foreign currency: a VAT invoice in another currency must also show the figures in euro, at the Central Bank's selling rate.
• Late payment: the UK statutory interest above is a UK rule; Ireland has its own.

Revenue's full list of VAT invoice details, deadlines and rates is on our Ireland invoice template page.

Key takeaways

• Every invoice needs a unique number, your details, the customer's name and address, a description, the supply and invoice dates, the amounts and the total owed.
• Show your own name next to any business name, and an address for legal documents if you trade under a business name.
• Not VAT registered: no VAT on the invoice. Registered: add your VAT number, rates, amounts excluding VAT and the VAT in sterling.
• Use one running number sequence and never reuse a number.
• Without an agreed date, payment is due within 30 days; late business payers can owe 8% plus base rate, plus £40 to £100.
• Register for VAT once taxable turnover passes £90,000 over the last 12 months, and keep records at least 5 years after the 31 January deadline.

Sources

Read on 6 November 2026:

• GOV.UK, Invoices: what they must include
• GOV.UK, Payment obligations
• GOV.UK, Become a sole trader and Choose your business name
• HMRC, Record keeping (VAT Notice 700/21)
• GOV.UK, VAT rates
• GOV.UK, Late commercial payments
• GOV.UK, Register for VAT
• HMRC, Place of supply of services (VAT Notice 741A)
• GOV.UK, Business records if you're self-employed
• HMRC, Making Tax Digital for Income Tax: if and when
• Revenue, VAT thresholds, Invoices issued by unregistered persons and Information required on a VAT invoice

How Clodou helps

Clodou is an AI back office for freelancers and small teams: you ask in a sentence, and it writes the invoice.

• UK or Irish wording. Set your workspace country to United Kingdom (or Ireland): the tax line reads VAT and your number prints after "VAT reg. no." ("VAT no." in Ireland). Each invoice can use its own currency, never converted.
• Not VAT registered? Remove VAT from your default taxes in Settings, and invoices carry no tax line.
• One sentence per invoice. "Invoice Harbour & Pine Ltd for 5 pages of website copy at £180 and 2 hours of edits at £45, supplied on 3 November, due in 14 days." Clodou finds or creates the client, numbers invoices from INV-0001, and asks for a missing price instead of inventing one.
• The GOV.UK details. Your own name goes in the activity line under your business name ("Alex Morgan, sole trader"). The date of supply prints next to the issue date when they differ.
• VAT per line. Each line can carry 20%, 5%, 0% or no VAT, with a rate column on the PDF. A discount is a minus line, taxed like the lines it reduces.
• Notes on the PDF for bank details, "Not registered for VAT" or reverse charge wording.
• After it goes out. Ask "Who owes me money?". Payment reminders and partial payments are cards an owner or admin approves; by default nothing is emailed to a client before that.

Clodou does not check invoices against HMRC's rules, file VAT returns, work as Making Tax Digital software, calculate statutory interest, show VAT in sterling on a foreign-currency invoice or issue credit notes.

Every new workspace starts with a 14-day Team trial, no card needed. After that, the Free plan includes 20 AI requests and 3 quotes or invoices a month; Solo is $29 and Team $79 a month per workspace.