How do I end a contract for non-payment?
The short answer
Only if allowed. The contract decides: look for a clause that lets you end it for non-payment and follow its notice exactly. With no clause, only a serious breach, such as a clear refusal to pay, may let you walk away, and a court decides afterwards. A late payment date alone is rarely enough: for a sale of goods, the Sale of Goods Act 1979 says1 time of payment is not "of the essence", which means a missed date does not by itself let the seller end the deal, unless the contract shows a different intention.
England and Wales only. WolfX is software, not a law firm.
What you can add
Two invoices of £1,850, one notice
Say you clean an office under a monthly contract. Two invoices of £1,850 are unpaid: one due on Monday 31 August 2026, one on Wednesday 30 September. The contract lets either side end it if an undisputed sum is still unpaid 14 days after written notice. You hand a notice to the client's registered office on Monday 12 October, so the cure date is Monday 26 October. Both invoices went late between 1 July and 31 December 2026, so interest runs at the rate fixed on 30 June: 11.75%.
- First invoice, due 31 August 2026£1,850.00
- Second invoice, due 30 September 2026£1,850.00
- Interest on the first: £1,850 × 11.75% ÷ 365 × 56 days5£33.35
- Interest on the second: £1,850 × 11.75% ÷ 365 × 26 days5£15.48
- Fixed sum on the first (invoices from £1,000 to £9,999.99)6£70.00
- Fixed sum on the second6£70.00
- Owed on 26 October 2026£3,888.83
If the invoices are still unpaid on 27 October, the contract ends, and interest keeps growing by £0.60 a day on each. A claim for about £3,889 then costs a £205 court fee.
The road ahead
Six steps. One court fee, if it comes to a claim.
Step 1: Read what the contract says about ending it
Look for "terminate", "default" or "material breach". Note the notice it asks for, any cure period (days to pay before the ending bites) and how notice must be delivered. Follow all three exactly.
Step 2: Check the ground is real
No clause, or one that doesn't fit? A missed date alone rarely lets you end it, and for goods the Sale of Goods Act says so1. A clear refusal to pay, or non-payment that goes to the root of the deal, may, and a court decides afterwards. On a large or long contract, or with a client you can't afford to lose, ask a solicitor who does commercial contracts first.
Step 3: Warn first, in writing
Send the letter below. Give the number of days the clause asks for; if it names none, 14 days is what the court's rules treat as a reasonable time10 for a company to reply.
Expect payment, a dispute or silence. If they pay in full, the contract carries on. If they dispute the invoice, the road changes: read what happens when a client disputes an invoice.
Step 4: Keep supplying until the end date
Do the work the contract asks for until then. Walking away early can make you the one in breach, and the client may claim the cost of replacing you. To pause instead of end, see stopping work for non-payment.
Step 5: End it on the stated date
If the invoices are still unpaid, send one short note that day: the contract has ended under the clause, as the notice said, and the debt stays due. Send it the way the clause says, with no new deadline.
Still holding goods they haven't paid for? You can give notice that you intend to re-sell them2. If they don't pay within a reasonable time, you may re-sell and claim any loss from them.
Step 6: Bill the rest, then claim
Ending the contract does not end the debt. Both invoices stay due, with interest at 11.75% a year8 (8% over the base rate7) and a fixed sum on each6. Send a final invoice for work done up to the end date.
A claim of £3,000.01 to £5,000 costs a £205 court fee9. A sole trader must get 30 days to reply11 first.
A letter you can copy
Notice of unpaid invoices and intention to end
Send it when an undisputed invoice is overdue and you are ready to end the contract. With no ending clause, it works as a firm final notice. To a sole trader, leave out the court claim.
Tap a highlighted gap to see what goes in it.
Send it exactly as the clause says: recorded post, hand delivery to the registered office, or the email address it names. If the clause is silent, email it, post a copy, and keep proof of both. Check the sum is undisputed before you send. A notice for an amount the client has queried in writing can put you in the wrong. With no ending clause, take advice from a solicitor who does commercial contracts before you send the line that ends the contract. The rest works as a firm final notice.
When not to bother
When it isn't worth it
- It's one late invoice from a client who usually pays. Ending a contract over it costs you the client and the work. Chase it politely instead.
- The invoice is disputed. A notice for a sum the client is contesting can put you in the wrong. Settle the undisputed part first and treat the rest as a separate argument.
- The client is in an insolvency process. The Insolvency Act3 limits ending supply and bars old debts as a condition of carrying on. See administration.
- It's a construction job you want to keep. Section 1124 lets you suspend on at least seven days' notice and keep any right to end. How to give that notice.
- They're a consumer, or you're in Scotland or Northern Ireland. These pages cover sales between businesses in England and Wales, and the other routes differ.
The Wolf's note
Ending the contract and getting paid are two separate jobs. The first follows the clause, with one warning that carries a date. The second does not wait for the first: the invoices stay due either way, so bill them right up to the end date.
Mr. Wolf · the AI inside WolfX
What comes next
Your next move
How do I give notice that I'm pausing work for non-payment?
Seven days' notice that states the ground, on a construction job where a notified sum is unpaid.
6 min read · Letter included
If they go under
The company says it's closing down. What should I do right now?
Today. If a client says it is closing down or going out of business, check Companies House and the Gazette for which kind, then write with the sum worked out.
8 min read · Letter included
If they push back
My client cancelled the project halfway. Do I still get paid?
Yes, for the work done up to the day they cancelled.
6 min read · Letter included
Don't want to do this yourself?
The Wolf does every step for you. He works out the sums, writes the letters and keeps track of every date. Nothing goes without your yes.