TL;DR: Every UK tradesperson needs to send proper invoices. It's how you get paid, stay compliant with HMRC, and protect yourself if a job is ever disputed. This guide covers exactly what must go on a UK invoice, how to handle VAT, how to set payment terms that work, and the mistakes that slow down payment. It also covers Making Tax Digital, which is already affecting sole traders earning over £50,000.
Two thirds of tradespeople are currently chasing at least one overdue invoice. The average amount owed is over £2,000. That's a lot of money sitting in limbo while you're on to the next job.
Some customers will always drag their feet. But most late payments come down to one thing: an invoice that gave them no reason to act. Wrong details, no due date, vague descriptions. Fix the invoice, and you remove the excuse.
This guide tells you how to invoice as a tradesperson in the UK. What must legally be on every invoice. How VAT works. What payment terms to set. And how to stop money slipping through the cracks. Whether you're a plumber, electrician, roofer, or landscaper, the rules are the same.
What must go on a UK tradesperson's invoice?
A legally compliant UK invoice must include your name and contact details, your customer's name and address, a unique sequential invoice number, the invoice date, a clear description of the work carried out, the total amount due, and your payment terms. If you're VAT-registered, additional fields apply.
Here's the full checklist for non-VAT-registered sole traders:
- The word "Invoice" at the top
- Your name (or business name) and address
- Your contact details (phone number or email)
- Your customer's name and address
- A unique invoice number (sequential, no gaps)
- The invoice date and the date the work was completed
- A clear description of the work carried out
- The total amount due
- Your payment terms and due date
- Your bank details (sort code and account number)
If you work at a specific site, include the site address too. Which? Trusted Traders also recommend including a complaints policy on your invoices. It shows professionalism and is expected practice for traders working with domestic customers.
If you're VAT-registered, you'll also need to add your VAT registration number, the VAT rate applied to each item, the VAT amount, and a grand total that separates net and VAT clearly. Stripe's HMRC compliance guide sets out the full VAT invoice requirements in plain English if you need the detail.
Do you need to charge VAT on your invoices?
You only charge VAT if your business is VAT-registered. You must register once your taxable turnover exceeds £90,000 in any 12-month period. Below that threshold, don't mention VAT on your invoices at all. Not "VAT: N/A", not "zero-rated". Nothing. Including VAT language when you're not registered is misleading and can cause problems with HMRC.
If you are VAT-registered, most domestic trade work is charged at the standard rate of 20%. Some work qualifies for the reduced 5% rate. Installing energy-saving materials in residential properties is one example. If you do this kind of work, check HMRC's guidance or speak to an accountant to confirm the correct rate.
If you work as a subcontractor and fall under the Construction Industry Scheme (CIS), there are additional rules around the domestic reverse charge. This affects VAT-registered businesses in construction. Our guide to job management software for electricians covers how the reverse charge works in practice, and our gas engineer software guide includes notes on VAT complexity for gas engineers working across different rate categories.
You can voluntarily register for VAT below the £90,000 threshold. This lets you reclaim VAT on materials and tools, but it means more paperwork and adds VAT to your customer invoices. Whether it's worth it depends on your costs and your customer base. An accountant can help you decide.
How do you number your invoices correctly?
HMRC requires every invoice to have a unique, sequential number. There are no gaps and no duplicates. Beyond that, the format is up to you.
Most tradespeople use a simple system like INV-001, INV-002, and so on. A date-based system works just as well: INV-2026-001, INV-2026-002. If you work for repeat customers, you might prefer a client reference system like JONES-001 or SMITH-001. Pick one approach and stick with it.
Gaps in your numbering matter. If HMRC ever reviews your records and sees invoice numbers jumping from INV-047 to INV-052, they'll want to know what happened to 48 through 51. HMRC's own guidance is clear that sequential numbering is required. If you void an invoice, keep a record of why rather than reusing or skipping the number.
If you're managing jobs manually across multiple customers, keeping track of your numbering sequence is one more thing to stay on top of. A job management tool that links invoices to customer records removes that risk entirely.
What payment terms should a tradesperson use?
The most common payment terms for tradespeople are 7 or 14 days. Set your terms before you start the job, state them clearly on the invoice, and include your bank details so there's no friction when the customer is ready to pay. An invoice with no due date gives the customer no reason to act quickly.
The UK government's late payment rules give you the right to charge interest on overdue invoices at 8% above the Bank of England base rate. You can also charge a fixed compensation fee of between £40 and £100 depending on the size of the debt. You rarely need to enforce this, but stating it on your invoice encourages prompt payment.
In March 2026, the government announced new measures to clamp down on late payments, including a new 60-day cap on payment terms when large firms pay smaller suppliers. This is good news for tradespeople doing commercial work. It won't solve every late payment problem, but it signals a shift in the right direction.
One practical tip: agree a deposit before you start on larger jobs. It's standard practice in the trades and it reduces your exposure if a customer drags their feet later.
How do you get paid faster as a tradesperson?
Send the invoice the day the job is done. Not at the end of the week. Not when you get round to it. Research on UK small businesses consistently shows that businesses using digital tools to send invoices promptly experience fewer overdue payments. The longer you wait to send, the longer it takes to get paid.
Be specific in your descriptions. List exactly what work was done, what materials were used, and how many hours were involved if you charge by time. Vague invoices invite questions. A customer who doesn't understand what they're being charged for will take longer to pay, or come back with a dispute.
Over half of UK small businesses have invoices more than 30 days overdue. Most late payments are down to forgetfulness rather than intent. Follow up on the due date if payment hasn't arrived. A short, polite message is usually all it takes.
Keeping your jobs and customer records in one place makes this easier. When you can see every job, its status, and who owes what at a glance, you don't let things slip. That's exactly what job management software for tradespeople is built to handle. If you're also managing plumber jobs and payments, our job management software for plumbers guide covers how to keep jobs organised from enquiry to completion.
What is Making Tax Digital and does it affect your invoices?
Making Tax Digital for Income Tax (MTD) requires sole traders earning over £50,000 to keep digital records and submit quarterly updates to HMRC from April 2026. The threshold drops to £30,000 from April 2027. If you're in scope, paper invoices and spreadsheets won't meet the requirements. You'll need software that connects to HMRC's systems.
MTD doesn't change what goes on your invoice. It changes how you store and report your financial records. Instead of one Self Assessment return at the end of the year, you'll submit four quarterly updates summarising your income and expenses, then a final year-end declaration.
Around 700,000 self-employed workers are in construction alone. A significant number of them will fall within scope of MTD. Yet only 30% of sole traders have a clear understanding of what MTD actually involves. Seven in ten either haven't heard of it or don't realise it means digital record-keeping and quarterly submissions.
If you're not yet in scope, it's still worth getting organised now. The threshold is expected to fall further in the coming years. Getting into the habit of keeping digital records today means the transition will be straightforward when it applies to you.
What are the most common invoicing mistakes tradespeople make?
No payment due date. If you don't state when payment is due, you have no grounds to chase it. Always include a specific date, not just "payment on completion."
Vague job descriptions. "Plumbing work" tells the customer nothing. Which? Trusted Traders are clear that descriptions should match the original quote and detail exactly what was done. The more specific you are, the fewer queries you'll get.
Gaps in invoice numbers. As covered above, gaps in your sequence raise questions with HMRC. Keep your numbers running in order, every time.
Waiting too long to send. The longer you leave it, the harder it is to get paid. Invoice the same day, every time.
Not keeping copies. HMRC requires you to keep invoice records for at least five years after the 31 January Self Assessment deadline for the relevant tax year. If you're VAT-registered, that extends to six years. Store digital copies as a minimum.
Sending invoices with no bank details. Include your sort code and account number on every invoice. If the customer has to email you to ask how to pay, you've already introduced a delay.
Conclusion
Invoicing doesn't have to be complicated. Get the legal fields right. Set your payment terms before the job starts. Send the invoice the same day the work is done. Follow up promptly if payment is late.
Those four habits will put you ahead of most tradespeople when it comes to getting paid on time.
If you're currently tracking jobs in your head or across a few WhatsApp messages, it's worth thinking about how you manage the bigger picture. Knowing which jobs are complete, which invoices are outstanding, and which customers are overdue is much easier when everything's in one place. Trader is built to help tradespeople manage customers and track jobs from enquiry to completion, so nothing slips through the cracks.
Frequently Asked Questions
Do I legally have to send invoices as a sole trader?
If you're VAT-registered, you're legally required to issue a VAT invoice for every transaction with another VAT-registered business. If you're not VAT-registered, HMRC doesn't mandate invoices for every job, but you should send them regardless. Invoices are your legal record that work was done and payment is owed. They protect you in a dispute and are essential for your Self Assessment tax return.
How long do I have to keep invoices in the UK?
HMRC requires sole traders to keep invoice records for at least five years after the 31 January Self Assessment deadline for the relevant tax year. If you're VAT-registered, the requirement extends to six years. Digital copies are acceptable. You don't need to keep paper versions.
What happens if a customer doesn't pay my invoice?
Start with a polite follow-up on or just after the due date. Most late payments are down to oversight rather than intent. If payment still doesn't arrive, you're legally entitled to charge interest at 8% above the Bank of England base rate, plus a fixed compensation fee of between £40 and £100, under the Late Payment of Commercial Debts Act. For persistent non-payment, small claims court is an option for debts under £10,000 and doesn't require a solicitor.
Can I send invoices by email or do they need to be posted?
Email is perfectly acceptable and is now the standard for most tradespeople. HMRC has no requirement for paper invoices. Send your invoice as a PDF attachment and keep a copy for your records. Some customers, particularly older clients or certain commercial contracts, may still prefer a posted invoice. If so, use recorded delivery.
What's the difference between a quote and an invoice?
A quote is a document you send before the work starts. It sets out what you'll do and what it'll cost. The customer accepts it before you begin. An invoice is a formal request for payment sent after the work is done. It should reflect what was actually carried out, which in most cases matches the original quote. If the scope of work changed, update the invoice and note the reason.
