Invoice Payment Terms: Understanding UK Law for Tradespeople

Invoice payment terms can be a minefield for UK tradespeople. With late payments costing UK businesses an estimated £23.4 billion annually, understanding the legal framework is important for protecting your income. Here's a complete guide to help you get paid on time.

Understanding UK law on invoice payment terms

The Late Payment of Commercial Debts (Interest) Act 1998 sets out your rights to charge interest and claim debt recovery costs if a payment is late. The statutory interest rate is 8% above the Bank of England base rate. For example, if the base rate is 1.5%, you're entitled to charge 9.5% on overdue amounts.

The Act also allows you to enforce a 30-day payment term as the default, unless you've agreed otherwise. Remember, you can specify shorter or longer terms in your contracts to suit your business needs.

Key components of invoice payment terms

When drafting invoice payment terms, clarity is key. Include the following:

• Payment due date: State clearly when payment is due. A common practice is 30 days post-invoice date.

• Accepted payment methods: Specify how clients can pay — bank transfer, cheque, online payment, etc.

• Late payment fees: Mention any charges for late payments, including interest rates as stipulated by the Act.

• Discounts for early payment: Encourage prompt payment with a small discount.

Choosing the right payment terms for your trade

Not every trade works the same way, and your payment terms should reflect the type of work you do. A plumber called out for an emergency leak repair is in a very different situation to a builder doing a three-month extension.

For small, same-day jobs (boiler repairs, electrical faults, blocked drains), payment on completion is perfectly reasonable. Many tradespeople take card payments on site now, which eliminates the chasing entirely. If you do offer terms on smaller jobs, keep them short — 7 or 14 days at most.

For larger projects, stage payments work well. A common structure is 25% deposit, then progress payments at agreed milestones, with the final balance due on completion. This protects your cash flow and limits your exposure if something goes wrong with the client relationship.

For ongoing commercial contracts — say you're an electrician doing regular maintenance for a property management company — 30-day terms are standard. But make sure those terms are agreed in writing before you start work. A verbal agreement about payment terms is hard to enforce if things turn sour.

Practical example: setting terms for a Birmingham plumber

Say you're a plumber in Birmingham who just finished a £3,200 bathroom refit. Your invoice might include:

Debt recovery costs you can claim

Beyond interest, the Late Payment of Commercial Debts Act also entitles you to claim a fixed sum for debt recovery costs. This is on top of the interest and is designed to compensate you for the time and hassle of chasing payment.

The fixed compensation amounts are:

You can also claim reasonable costs for recovering the debt if the fixed amount doesn't cover your actual expenses. This might include solicitor's letters or debt collection agency fees.

To calculate exactly what you're owed in interest and compensation, use our late payment interest calculator. It works out the daily interest from the due date and adds the fixed compensation automatically.

Ensuring compliance and following up

Once your terms are set, ensure they are included in every invoice. Tools like InvoiceAdept's free invoice generator make this straightforward. If a payment is late, use the late payment interest calculator to determine what you're owed.

Don't hesitate to send polite reminders a week before the due date. If payment is overdue, a firm but courteous follow-up can make all the difference.

What to do when a client disputes your terms

Sometimes a client will push back on your payment terms after the work is done. They might claim they never agreed to 14-day terms, or argue that they always pay at 60 days. This is where having written agreements saves you.

Before starting any job worth more than a few hundred pounds, send the client a written quote or estimate that includes your payment terms. An email is fine — it doesn't need to be a formal contract. When they reply with "Yes, go ahead," that's your written agreement. Save that email.

If a dispute does arise, stay professional. Refer back to the written agreement and the invoice terms. If the client still refuses to pay within the agreed terms, you have the legal right to charge interest from the day after the payment was due. Point them to the gov.uk guidance on late commercial payments — it tends to focus minds quickly.

For disputes that go beyond a simple disagreement on terms, consider using the Small Claims Court for debts up to £10,000. The process is straightforward, costs between £35 and £455 depending on the claim amount, and you don't need a solicitor.

How payment terms affect your cash flow

Your choice of payment terms has a direct impact on your cash flow. If you're offering 30-day terms on every job but your own suppliers want paying in 14 days, you're funding the gap out of your own pocket. Over time, that gap can grow into a serious problem.

Think about it this way: if you complete £5,000 worth of work per week and everything is on 30-day terms, you've got roughly £20,000 permanently tied up in unpaid invoices. That's money you can't use for materials, wages, or putting food on the table.

Shorter payment terms, deposits, and stage payments all help close that gap. You can also use our day rate calculator to make sure your pricing accounts for the cost of waiting for payments — because that waiting time has a real cost to your business.

Supporting tools and resources

Make use of these resources to simplify your invoicing:

• VAT calculator for accurate tax calculations.

• CIS calculator for construction industry subcontractor deductions.

• HMRC's guidance on late payments.

Proper tools and clear terms ensure timely payments.

FAQs on invoice payment terms in the UK

• What if my client refuses to pay? You can take legal action or use a debt collection agency. For debts under £10,000, the Small Claims Court is a straightforward option that doesn't require a solicitor. Start by sending a formal Letter Before Action giving 14 days to pay.

• Can I charge more than the statutory interest rate? Only if it's agreed upon in your contract. Otherwise, the statutory rate of 8% plus the Bank of England base rate applies. Any rate you set in a contract must still be considered reasonable under the Unfair Contract Terms Act.

• How do I handle international clients? Specify terms in your contract, including currency and payment method details. Be aware that the Late Payment Act only applies to commercial debts between UK businesses, so international clients may need different terms.

• Are electronic invoices legally binding? Yes, as long as they comply with all legal requirements and are agreed upon by both parties. HMRC accepts electronic invoices for all tax purposes.

• Can a client change payment terms after agreeing to them? Not unilaterally. Both parties must agree to any changes. If a client tries to extend your 14-day terms to 60 days after the fact, you're within your rights to insist on the original terms.

Organisation and clarity in invoicing are key to success.

Payment terms for different types of clients

Not every client is the same, and your payment terms don't need to be either. Here's how to think about terms depending on who you're working for:

Domestic customers (homeowners): For residential work, payment on completion is the norm for small jobs. For bigger projects, stage payments work best. Most homeowners expect to pay by bank transfer, though card payments are becoming more common. Keep terms short — 7 to 14 days maximum, since there's no business cash flow cycle to account for.

Small businesses and landlords: These clients usually expect 14 to 30 day terms. They're running a business too, so they understand the need for clear terms. Get everything in writing before starting work, and send invoices promptly so you get into their next payment run.

Main contractors (if you're subcontracting): This is where things get tricky. Main contractors often push for 30 to 60 day terms, and some try for even longer. Resist anything beyond 30 days if you can — your materials suppliers won't wait 60 days for their money, so why should you? If you're working under CIS, the contractor is already deducting 20% from your payments. Use our CIS calculator to check the deduction amounts.

Local councils and housing associations: Public sector clients often have rigid payment processes. Terms of 30 days are standard, but actual payment can take longer due to internal approvals. Factor this into your cash flow planning. The upside is that public bodies rarely default on payment entirely — it's just a matter of patience.

Whatever terms you agree, put them on every invoice you send. Our invoice generator lets you set default terms so they appear automatically on every invoice you create.