In brief: Clients pay invoices late for several different reasons: the invoice may be wrong or sent to the wrong person, their approval process may be slow, they may be managing a cash shortage, they may dispute the work, or the payment may simply fall off a crowded to-do list.

The fix depends on the cause. A better reminder cannot repair a missing purchase-order number, and a Direct Debit cannot resolve a genuine dispute about the work. Diagnose first. Then remove the particular bit of friction.

How serious is late payment for UK businesses?

Research published by the Department for Business and Trade and the Office of the Small Business Commissioner in July 2025 estimated that:

  • more than 1.5 million businesses are affected by late payments each year;
  • businesses are owed about £26 billion in late payments at any given time;
  • affected businesses are owed an average of roughly £17,000; and
  • businesses that spend staff time chasing lose an average of 86 hours a year to it.

Payment performance has improved among large businesses, but official 2025 statistics still showed 15% of reported invoices being paid late. Late payment is not an obscure edge case. It is a routine operating problem with a tie on.

1. The invoice went to the wrong person

The person who commissioned the work may not be the person who approves or pays it. In a larger organisation, an invoice can pass through procurement, a budget owner, accounts payable and a scheduled payment run.

Sending it to the friendly person who said “great work” is not the same as sending it into the customer’s payment process.

How to prevent it

  • Ask for the legal entity name, billing address and accounts-payable contact before work begins.
  • Confirm whether invoices must be uploaded to a portal or sent to a specific mailbox.
  • Keep the operational contact copied without relying on them to forward it.
  • Ask when the customer runs payments and what date the money should reach the account.

2. The invoice is missing information

A wrong company name, missing purchase-order number, unclear description, incorrect VAT treatment or duplicate invoice number can stop approval. Sometimes the customer cannot process the invoice. Sometimes the missing detail is used as a very comfortable chair while the clock continues ticking.

The Small Business Commissioner specifically advises businesses to identify the correct recipient, confirm payment schedules and obtain required PO numbers early.

How to prevent it

  • Create a customer-specific billing checklist.
  • Validate mandatory invoice fields before sending.
  • Do not start work that requires a PO until the PO exists, unless the commercial risk is consciously accepted.
  • Send invoices promptly, while the work and decision-makers are still fresh.

3. The payment terms were never truly agreed

“Net 30” sounds clear until one side means 30 days from the invoice date and the other means 30 days from month-end, acceptance, portal submission or approval.

An invoice can display a due date, but if that date conflicts with the contract or customer onboarding record, it may not control the process.

How to prevent it

  • Put the payment term in the proposal, contract and onboarding conversation.
  • State a specific calendar due date on every invoice.
  • Define what triggers the term: invoice date, delivery, acceptance or another event.
  • Confirm any unusually long or customer-specific terms before accepting the work.

4. The customer’s approval process is slow

The customer may want to pay but still have three approvals, a finance system, a fortnightly payment run and somebody on annual leave standing between intention and money.

This is common in larger organisations. It is also why waiting until the due date to ask whether the invoice was received is an optimistic little ritual.

How to prevent it

  • Send a receipt-confirmation message when the invoice is issued.
  • Ask whether the invoice has passed validation before it becomes due.
  • For milestone work, secure sign-off as each stage is delivered.
  • Schedule a courteous pre-due reminder early enough to fix an approval problem.

5. The invoice was forgotten

Some late invoices have no dramatic story. The email arrived, the customer planned to deal with it, another task arrived, and the invoice sank gently into the inbox sediment.

Bank transfer makes the customer responsible for noticing the invoice, logging into banking, entering the amount, choosing the reference and pressing send. Every step is small. The whole chain is still optional until somebody acts.

How to prevent it

  • Use automatic invoice delivery and reminders.
  • Make the due date and payment route unmistakable.
  • For repeat customers, agree an automatic method such as Direct Debit before the first invoice.
  • Connect payment status with accounting software so reminders stop when money arrives.

6. The customer is managing cash-flow pressure

A customer may be profitable on paper and still short of cash today. When several suppliers are due, businesses often prioritise payroll, tax, critical services and whoever is most likely to stop supply.

That does not make late payment acceptable, but it changes the response. A generic “just checking in” email may not solve a deliberate prioritisation decision.

How to reduce the risk

  • Check creditworthiness before offering substantial terms.
  • Use deposits, staged billing or lower credit limits for higher-risk work.
  • Watch for deteriorating payment behaviour rather than treating each invoice in isolation.
  • Agree a documented payment plan early where a customer communicates genuine difficulty.
  • Pause further credit in line with the contract where risk becomes unacceptable.

7. The invoice is disputed—or the delay is strategic

A genuine dispute may involve scope, quality, delivery, pricing or approval. It should be surfaced and resolved quickly. Silence is not a dispute-resolution process, despite its enduring popularity.

A minority of customers also delay payment deliberately because supplier credit is cheaper than borrowing. Warning signs include repeated promises without dates, invented administrative objections after the due date and payment arriving only when supply or escalation is threatened.

How to respond

  • Ask for the exact disputed item and the evidence supporting it.
  • Separate undisputed amounts and request payment of those immediately.
  • Record promises, dates and contacts.
  • Escalate according to a written credit-control process.
  • Consider current statutory interest, compensation and Small Business Commissioner routes where applicable, taking professional advice when needed.

How can a business identify the real cause?

Replace “Any update?” with precise questions:

  • Has the invoice been received and validated?
  • Is any information or purchase-order number missing?
  • Has the work been approved?
  • Is any part of the amount disputed?
  • What payment run is it scheduled for?
  • What exact date should cleared funds arrive?

Specific questions turn a vague delay into an operational fact. Facts are much easier to fix than “finance are looking at it”.

What should happen before the invoice is sent?

  1. Agree the payment method and term. Do this during the sale, when cooperation is highest.
  2. Capture billing requirements. Legal entity, contact, PO, portal, tax details and references.
  3. Set a credit limit. Decide how much unpaid work the business is willing to carry.
  4. Collect approval evidence. Keep signed proposals, orders, timesheets or milestone acceptance.
  5. Make automatic collection the default where it fits. Repeat variable invoices are a strong Direct Debit use case.

What does Direct Debit fix?

Direct Debit removes the need for the customer to create a bank transfer for every invoice. With an active mandate, the agreed invoice amount can be scheduled around the due date after the required notice.

It is particularly useful where late payment is caused by memory, inbox overload, payment-entry friction or inconsistent manual processes.

What does Direct Debit not fix?

It does not fix:

  • an invoice that is wrong;
  • a genuine contractual dispute;
  • a customer with insufficient funds;
  • poor credit decisions;
  • a cancelled mandate; or
  • work delivered to a company that was never likely to pay.

Payment automation is powerful. Due diligence remains annoyingly employed.

A practical late-payment workflow

  • When issued: send the invoice to the validated recipient and confirm receipt.
  • Before due: check approval status and resolve missing information.
  • On the due date: send a clear notice if payment has not arrived.
  • Immediately overdue: ask for the exact payment date and reason for delay.
  • Repeatedly overdue: change terms, reduce credit, require a deposit or automatic collection.
  • Seriously overdue: follow the contract and formal escalation process; consider professional recovery support.

How NRTH reduces avoidable late payment

NRTH connects invoice data from Xero, QuickBooks or Sage with Direct Debit collection. The customer authorises a mandate, the invoice supplies the amount and due date, and the payment workflow no longer depends on a fresh bank transfer every month.

The purpose is not to make reminder emails more elaborate. It is to remove the cases where a reminder should never have been necessary.

Frequently asked questions

Should an invoice be chased before it is due?

A polite pre-due check can be useful, especially for large or first invoices. Frame it as confirmation that the invoice is received, valid and scheduled, not as an accusation.

How quickly should a late invoice be chased?

Start promptly and follow a consistent process. Delaying the first contact signals that the stated due date may be flexible.

Can late-payment interest be charged?

UK businesses may have contractual or statutory rights to interest and compensation on qualifying commercial debts. The rules and any proposed reforms should be checked against the current contract and official guidance before applying charges.

Will Direct Debit guarantee payment?

No. It removes customer-action friction but a collection can still fail, for example because of insufficient funds or a cancelled instruction.

Late payment has different causes. “Send another reminder” is only one tool—and often not the cleverest one.

For repeat invoice customers, see how NRTH removes the monthly bank-transfer step.

Sources and further reading

Last reviewed: 21 July 2026. This is general operational information, not legal or financial advice.