How to chase unpaid commercial invoices without damaging the relationship

Chase unpaid commercial invoices without turning a valued B2B customer into a courtroom opponent. Soft reminders, clear facts, and a proportionate timeline usually protect the relationship better than silence or sudden escalation. The fee is 15% of what is recovered, payable only when you have been paid. Recovery is not guaranteed.

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 article is about relationship-aware chasing on undisputed commercial balances — not a full repeat of our when to instruct as a UK SME guide or our payment plan vs debt collection comparison. Money pages: unpaid invoices and letter before action.

Why does calm chasing protect cash flow and the account?

Most overdue B2B invoices are process failures, not fraud: a PO mismatch, a missing goods-received note, an accounts-payable backlog, or a contact who left. An aggressive first chase can close a door that a factual reminder would have opened. A calm sequence:

1. 1. Confirms the entity, amount, and due date in writing.
2. 2. Gives the buyer a clean path to pay or raise a real dispute.
3. 3. Builds a paper trail if you later need a letter before action or a partner.

Preserving the relationship does not mean endless courtesy while cash sits unpaid. It means firm, documented steps that stay proportionate until soft chase has clearly failed.

What does a professional chase sequence look like?

Use the same tone you would want from a supplier you still trade with.

Day after due date (or your internal grace): short email — invoice number, amount, due date, remittance details, and a polite ask to confirm payment date. Attach the PDF again.

Second chase (about 7 days later): phone plus email summary. Ask who in AP owns the invoice. Note any promise in writing the same day.

Third chase (about 14 days overdue): firmer “overdue account” email. Restate the balance, list what you have sent, and give a clear pay-by date.

Final commercial demand (before formal LBA): one clear letter stating that if payment is not received by a named date you will escalate under pre-action rules and may instruct recovery. Still factual; still B2B.

Keep every chase with the invoice, PO or contract, delivery proof, and replies. More on evidence: proof of debt before instructing.

What tone recovers money without burning bridges?

Write as credit control, not as a threat:

1. 1. Use the legal company name and correct invoice reference every time.
2. 2. Separate the debt from the people — “the account is overdue”, not “you are ignoring us”.
3. 3. Invite a dispute early in writing.
4. 4. Confirm verbal promises by email the same day.
5. 5. Do not invent late fees or badges; cite Late Payment rules accurately if you claim interest or compensation.

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 statute is the Late Payment of Commercial Debts (Interest) Act 1998. On a qualifying commercial debt you may also claim fixed compensation under section 5A (£40, £70, or £100 depending on debt size). Those figures are statutory add-ons, not a partner’s commission.

When does “keeping the relationship” become expensive?

Relationship caution stops helping when:

1. 1. Promises to pay are repeatedly broken with no new evidence.
2. 2. The buyer goes silent after acknowledging the debt.
3. 3. AP asks for endless re-sends but never remits.
4. 4. The balance is large enough that waiting harms your own suppliers or payroll.
5. 5. You discover the wrong entity was invoiced and need a clean LBA to the right company.

At that point a formal letter before action is often less damaging than months of informal nagging. A clear LBA shows you are serious, gives a structured reply window, and still leaves room for payment or a short plan. Detail: letter before action for business debts and letter before action.

Is a Practice Direction letter still fair to a valued customer?

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.

A proportionate LBA is not an attack on the relationship; it is the civil-procedure step courts expect before escalation. If a limited company ignores a final demand, see limited company ignores final demand.

Should you agree a payment plan or instruct a partner?

If the customer engages, proves temporary cash strain, and the debt is undisputed, a short written payment plan can preserve trade while clearing the balance. If they ignore the LBA, dispute without evidence, or the plan collapses, instructing a collection partner is usually cleaner than more polite emails. Compare options: payment plan vs debt collection. Overview of the unpaid-invoice path: unpaid invoices.

Debt Collection UK introduces B2B files; partners collect. Marketing here describes 15% only when the client is paid — often framed as no-collection, no-fee. You agree the partner’s written terms before they start. Recovery is not guaranteed. The fee is 15% of what is recovered, payable only when you have been paid.

What should you check before you escalate?

1. 1. Confirm the debtor’s legal name and that the balance is still unpaid B2B.
2. 2. Assemble invoice, contract or PO, delivery or completion proof, and the full chase history.
3. 3. Offer one clear window to pay or raise a written dispute.
4. 4. Add Late Payment interest and the correct £40 / £70 / £100 band where the Act applies.
5. 5. Send a Practice Direction letter with a named pay-by date.
6. 6. If ignored, decide: short written plan, instruct a partner on a fixed percentage (15% only when the client is paid), or take advice on court. Recovery is not guaranteed.

Frequently asked questions

How do I chase unpaid commercial invoices without damaging the relationship? Stay factual, documented, and proportionate: reminder, follow-up, overdue notice, then a clear final commercial demand before a Practice Direction letter before action. Invite genuine disputes early and confirm promises in writing.

When should I stop soft chasing and send a letter before action? When promises break, silence follows acknowledgement, or the overdue balance starts harming your cash flow. A calm LBA is usually clearer — and fairer — than endless informal nudges. See letter before action for business debts.

Can I claim interest while still trying to keep the customer? On qualifying commercial debts, the Late Payment Act may allow statutory interest and fixed compensation. Claiming those rights in a polite schedule is different from aggressive tone. See GOV.UK late commercial payments.

Does instructing a collection agency end the trading relationship? It can strain it, which is why soft chase and a proper LBA come first. Many creditors instruct only after commercial steps fail. Partners collect; we introduce. Recovery is not guaranteed.

Does recovery cost nothing if I upload an invoice here? No. This guide and the upload path have no upload fee. Partner recovery is usually a fixed percentage of what is recovered (marketing: 15% only when the client is paid; often no-collection, no-fee). Recovery is not guaranteed.

What if the invoice is genuinely disputed? Pause hard collection until the dispute is clarified in writing. Do not instruct a partner on a file you know is contested without sorting the substance first. We are not solicitors; take advice if needed.

If soft chasing has run its course and an unpaid commercial invoice is still blocking cash flow, a firm letter before action — then instruction where needed — is the proportionate next step. 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.