Short answer: An SME should instruct when internal chasing starts costing more time than it is likely to recover: usually after reminders, a call to a decision-maker and a letter before action have failed on an undisputed invoice. The 15% fee applies only when you are paid.
For a UK SME, invoice debt collection is less about day-counting theatre and more about cash flow. Soft reminders, polite calls, and “one more email” burn hours that owners and bookkeepers do not have. This guide answers a narrower question than our earlier timeline piece: when should a small or medium-sized business stop chasing an unpaid commercial invoice internally and instruct a partner?
Debt Collection UK (a trading style of PASECOM GROUP LTD) introduces B2B files to independent partner agencies. We are not solicitors, we are not authorised by the Financial Conduct Authority, and we do not collect consumer credit. PASECOM GROUP LTD was incorporated on 7 April 2026. We introduce commercial claims; we do not issue proceedings. Partners collect. Recovery is not guaranteed.
This guide is for undisputed business-to-business balances owed to SMEs. For the wider service path see unpaid invoices, business debt collection and debt collection for small business. Related hub reading: at what point should you pass an unpaid invoice to a debt collector (general timeline), letter before action for business debts, late payment compensation £40 / £70 / £100, aged debt over 90 days, proof of debt documents, and no collection, no fee explained.
How does this differ from the general “at what point” guide?
The earlier guide on when to pass an unpaid invoice to a debt collector maps a broad credit-control timeline. This article is SME-specific: it weighs owner time, cash-flow tipping points, and whether the debt is still undisputed, then explains how Late Payment rights and a Practice Direction letter sit before instruction. Use both pieces together — timeline for structure; this one for the instruct decision.
What is the real cost of SME chasing?
In a small business, credit control often sits with the same person who sells, delivers, or runs the books. Each chase cycle has a cost:
- 1. Drafting and sending reminders.
- 2. Chasing purchase-order or query answers.
- 3. Logging promises that slip.
- 4. Distracting from paid work.
If those hours exceed the value of keeping the relationship “friendly”, internal chasing has already failed on commercial grounds — even if the calendar still looks early. Stop when the time cost of another round of chase exceeds any realistic gain from waiting, or when cash needed for wages, tax, or suppliers is blocked by one overdue invoice.
Which Late Payment rights strengthen an SME claim?
GOV.UK explains that where another business is late paying for goods or a service, you may be able to claim interest and debt recovery costs — see GOV.UK late commercial payments.
The core statute is the Late Payment of Commercial Debts (Interest) Act 1998. On a qualifying commercial debt, once statutory interest runs you may also claim fixed compensation under section 5A:
- 1. £40 where the debt is less than £1,000.
- 2. £70 where the debt is £1,000 or more but less than £10,000.
- 3. £100 where the debt is £10,000 or more.
Those figures sit in addition to interest. They do not replace a clear schedule of claim. More: late payment compensation and statutory interest.
How should you set out the claim before you escalate?
For company-versus-company files in England and Wales, follow Practice Direction – Pre-Action Conduct and Protocols: set out the claim, list key documents, say what you want and by when, and allow a reasonable time to reply — typically 14 days in a straightforward case.
That letter before action is the orderly stop to soft chasing. Detail: letter before action for business debts. Assemble evidence first: proof of debt documents.
What are the cash-flow tipping points for SMEs?
Instruct sooner when any of these apply:
- 1. Payroll or VAT pressure — the unpaid invoice is needed for a near-term liability.
- 2. Broken promises — a firm pay-by date passes with silence or a recycled excuse.
- 3. Radio silence after a clear statement of account and a formal letter.
- 4. Account on stop already — you have halted supply and still have no funds.
- 5. Aged balance drifting past 60–90 days with no credible plan — see aged debt over 90 days.
None of these require inventing recovery statistics. They are commercial signals that internal chase has stopped working.
Is the invoice undisputed or disputed?
Pre-legal invoice debt collection is for undisputed commercial debt. If the buyer raises a genuine written dispute — quality, quantity, delivery, or contract terms — pause collection chase until you answer it with evidence. Fabricated late disputes used only to stall payment are different: document the timeline and keep the claim clear. Do not instruct a partner on a file you know is genuinely contested without sorting the dispute first.
When should an SME instruct? A calm checklist
- 1. Confirm the debtor entity and that the balance is still B2B and unpaid.
- 2. Gather invoice, contract or PO, delivery proof, and chase history (proof of debt).
- 3. Calculate statutory interest and the correct fixed compensation band where the Late Payment Act applies.
- 4. Send a proportionate Practice Direction letter with a clear pay-by date.
- 5. If the deadline passes with silence (or another broken promise), stop internal chasing and instruct.
- 6. The fee is 15% of what is recovered, payable only when you have been paid. Recovery is not guaranteed. More: no collection, no fee explained.
Court remains an option if collection does not resolve the file, but small claims routes are often slower and bring separate fees — see GOV.UK make a court claim for money. Debt Collection UK does not issue proceedings. Partners collect.
Frequently asked questions
When should a UK SME stop chasing an unpaid invoice and instruct collection? When the time cost of further internal chase outweighs any realistic gain, cash-flow pressure is real, and a proportionate Practice Direction letter has been ignored or met with broken promises — provided the debt remains undisputed B2B.
How is this different from a general “when to instruct” timeline? The at what point guide gives a broad day-based structure. This article focuses on SME cash flow, owner time, Late Payment figures, and the instruct decision after a proper letter.
Do Late Payment Act rights mean I get paid automatically? No. Interest and fixed compensation can strengthen the claim schedule. They do not guarantee payment or transfer a partner’s commission onto the debtor by default.
What does “15% only when the client is paid” mean? The fee is 15% of what is recovered, payable only when you have been paid. Marketing here describes 15% only when the client is paid — often framed as no-collection, no-fee. Agree terms before they start. The fee is 15% of what is recovered, payable only when you have been paid. Recovery is not guaranteed.
Can Debt Collection UK take the debtor to court for me? No. We introduce B2B files to independent partner agencies. We are not solicitors and we do not conduct litigation. You remain the creditor if court action is needed.
If an unpaid commercial invoice is blocking your SME’s cash flow, stop hoping another soft reminder will clear it. Send a clear Practice Direction letter, then instruct when that fails. The fee is 15% of what is recovered, payable only when you have been paid. Recovery is not guaranteed. Upload the invoice and terms when you are ready to instruct, or use our debt collection for small business money page.