What can you actually do about late-paying customers?
Considerably more than most small businesses realise — including a statutory right to interest and compensation that does not need to be in your contract, and that many suppliers never claim because they do not know it exists.
The statutory position for business-to-business debts. Where no payment date is agreed, payment is due 30 days after the later of delivery or invoice. Agreed terms can be longer, but terms that are grossly unfair to the supplier can be challenged.
What you are entitled to when payment is late:
Statutory interest at the Bank of England base rate plus 8%, running from the day after payment was due.
Fixed compensation per invoice, on a scale according to the debt size — a set amount for smaller debts rising for larger ones.
Reasonable costs of recovery above that fixed sum, where they exceed it.
These apply automatically. You do not need a clause; you cannot be contracted out of them by a term that is grossly unfair.
The escalation sequence that actually works:
Invoice correctly in the first place. A remarkable share of late payment is caused by a missing purchase order number, the wrong entity name, or delivery to the wrong address. Check the customer's process before invoicing.
Chase early and by phone. Written reminders are easy to ignore; a call to the actual payables contact is not.
Escalate in writing, stating the amount, the due date, and that you will apply statutory interest and compensation.
A formal letter before action, setting a deadline and stating the intended next step. This resolves a large proportion of disputes on its own.
Court claim, for straightforward debts, which can be issued online and is inexpensive for smaller sums. A statutory demand is a different and riskier route where the debt is genuinely disputed.
What prevents the problem:
Credit checks before extending terms.
Written terms, including retention of title on goods.
Deposits and staged payments for larger work.
Stopping work where your contract allows it — the strongest practical leverage.
General information, not legal advice.