What to Do When a Business Ignores Your Invoice (UK Guide)

There are few things more infuriating in the commercial world than a ghosting client. You delivered the goods, you completed the service to a high standard, and you submitted the invoice exactly as requested. But now, the payment deadline has sailed past, and your emails are being met with deafening silence.

When a B2B client ignores an invoice, it ceases to be a mere administrative delay; it becomes a direct threat to your own cash flow, payroll, and business growth. In the UK, late payments are an epidemic, causing thousands of otherwise healthy SMEs to fail every year.

If you are currently staring at an ignored invoice, you need to transition from "polite supplier" to "relentless creditor." Based on over 15 years of managing corporate credit ledgers, here is the definitive, step-by-step UK guide on exactly what to do when a business ignores your invoice—and how to ensure you get paid.

Step 1: Ensure Your Own House is in Order

Before you escalate the situation, you must verify that the delay isn't a result of a technicality on your end. Large corporate accounts departments will seize any excuse to reject or delay an invoice.

Take ten minutes to audit the unpaid invoice:

• Is the PO Number correct? If they operate a "No PO, No Pay" policy, a missing or incorrect Purchase Order number will halt payment immediately.
• Was it sent to the correct entity? Did you invoice the parent company instead of the specific subsidiary you dealt with?
• Did you send it to the right email? Sending an invoice to the personal email of the manager who hired you, rather than directly to accounts@company.co.uk, is a common reason for delays.

If everything is correct, move immediately to Step 2.

Step 2: The "Benefit of the Doubt" Chaser (Days 1–7 Overdue)

Assuming the invoice is correct, the first 7 days past the due date are the "benefit of the doubt" window. It is possible the invoice simply fell through the cracks of a busy accounts team.

Send a polite but firm email statement. Attach the original invoice again. Keep the tone professional and entirely devoid of emotion. If the email is ignored for 48 hours, pick up the phone.

Do not underestimate the power of a phone call. Emails are incredibly easy to ignore; a live conversation is not. Ask the accounts department directly: "Can you confirm this invoice is on the next payment run?" If they give you a vague answer, pin them down to an exact date.

Step 3: Escalate to the Decision Maker (Days 14–30 Overdue)

If you have hit the 14-day mark and the accounts department is still ignoring you (or feeding you the classic "the director isn't in to sign cheques" excuse), you must change your target.

Accounts payable teams are often instructed from above to hold onto cash for as long as possible. You need to bypass them and go straight to the person you originally did the deal with, or directly to the company directors. You can easily find the names of the active directors by searching the company on the UK Government’s Companies House register.

Send a direct email outlining the issue. Often, the operational managers are entirely unaware that their finance team is damaging their relationship with a vital supplier.

Step 4: Issue a Formal Letter Before Action (LBA)

If 30 days have passed and you are still being ignored, the period for polite internal credit control is officially over. It is time to initiate the pre-legal phase of debt recovery.

You must send a formal Letter Before Action (LBA). This is a vital legal document required by UK courts under the Pre-Action Protocol. It outlines exactly what is owed and sets a final, non-negotiable deadline (usually 7 days) before formal legal action or third-party debt collection begins.

Need help drafting this? We have created a comprehensive guide and a free UK Final Demand Letter template that you can copy and use immediately.

Step 5: Apply Statutory Late Fees and Interest

To give your LBA real teeth, you should hit the debtor where it hurts: their wallet. Many SME owners are unaware that they have immense power under the Late Payment of Commercial Debts (Interest) Act 1998.

Under this UK law, you are legally entitled to penalise a business that ignores your invoice by charging:

• Statutory Interest: At 8% above the Bank of England base rate.
• Fixed Compensation: Up to £100 per overdue invoice.
• Recovery Costs: You can legally pass the cost of using a debt collection agency onto the debtor.

Adding these charges to your final demand proves to the debtor that you know your legal rights and that ignoring you is going to cost them significantly more money. You can learn more about how to apply these charges on our Business Debt Collection services page.

Step 6: Skip the Hassle and Instruct an Agency

Let’s be completely candid: chasing bad debtors is exhausting. It drains your time, spikes your stress levels, and takes you away from actually running and growing your business. If a business has ignored your emails, dodged your phone calls, and disregarded your Final Demand, they are calling your bluff.

They assume you do not have the time, funds, or legal knowledge to actually take them to court. You need to prove them wrong.

This is exactly when you should instruct a specialist UK commercial debt collection agency. The psychological impact of a debtor receiving a formal demand from a regulated, third-party enforcement agency is massive. In the vast majority of cases, an invoice that has been ignored for months is suddenly paid within days of an agency taking over, simply because the debtor realises you have escalated the matter and their company's credit rating is now at severe risk.