Most staffing agencies have two states for an overdue invoice: chasing it, or writing it off.
What's missing is the middle — a structured escalation process that moves systematically from first reminder to final notice, with clear decision points and documented contact at each stage. Without it, invoices slip through the cracks, clients learn that slow payment has no consequences, and DSO creeps upward year on year.
This guide covers the full escalation process from due date to legal referral — practical, specific, and built for how staffing and recruitment billing actually works.
Staffing agencies have specific complications that generic AR guides don't address:
Timesheet disputes are common. A client disputes the hours before paying. The dispute process often involves a different contact than accounts payable. Resolution requires the placement manager, the accounts team, and sometimes the end-worker to align. Each step adds days.
Contractor relationships are at stake. Pushing hard on a client can create awkwardness for the consultant placed there. The business development and finance functions sometimes pull in different directions on how aggressively to chase.
Invoices are recurring. You're not just chasing one invoice — you're chasing this week's invoice, while last week's is still outstanding, and next week's is being prepared. The relationship is ongoing, which changes the tone of escalation.
Payment terms vary. Perm fees often have different terms (7–14 days) from temp/contract invoices (30 days). PSL and RPO contracts may have their own agreed terms. The escalation trigger point differs by client type.
Trigger: 3 days before invoice due date Channel: Email Purpose: Confirm the invoice was received, there are no queries, and payment is on track.
This is not a chase — it's a professional courtesy that eliminates the most common cause of late payment: invoices sitting unprocessed because no one flagged them. Most late payments at this stage are administrative, not intentional.
Template:
Subject: Invoice [number] — due [date]
Hi [name], just a quick note to confirm invoice [number] for £[amount] is due on [date]. Please let me know if you have any queries or need anything from us to process payment. Happy to resend the invoice if needed.
This message resolves the majority of invoices that would otherwise hit Day +7 or later.
Trigger: Invoice due date Channel: Email Purpose: Mark the due date; prompt immediate action.
Keep it brief and factual. No apologies for sending it.
Template:
Subject: Invoice [number] — due today
Hi [name], invoice [number] for £[amount] is due today. Please let us know your expected payment date or if there's anything holding up processing.
Trigger: 3–5 days overdue Channel: Email + SMS Purpose: First substantive chase. Still professional, not aggressive.
Add SMS at this stage. SMS has a 95%+ open rate and gets faster responses than email for simple confirmations like "Yes, paying this week."
Email template:
Subject: Invoice [number] — [X] days overdue
Hi [name], I wanted to follow up on invoice [number] for £[amount], which was due on [date]. Could you let me know the expected payment date? If there's a query on the invoice, happy to resolve it quickly.
SMS template:
Hi [name], following up on invoice [number] for £[amount] due [date]. Could you confirm your payment date? Reply or call [name] at [number].
Trigger: 7–10 days overdue Channel: Email + WhatsApp Purpose: Escalate channel. WhatsApp gets 90%+ open rates and prompts faster responses.
At this stage, the invoice is 1–2 weeks late with no explanation. Moving to WhatsApp signals that this is being tracked — without being aggressive.
WhatsApp template:
Hi [name], just following up on invoice [number] for £[amount] — it's now [X] days overdue. Could you let me know when to expect payment? Happy to resend the invoice or resolve any queries.
Trigger: 14–21 days overdue with no response or commitment Channel: Email (formal) + phone call Purpose: Formal escalation. Clear that next steps will follow if unresolved.
This is the point where the communication shifts from reminder to notice. The email should be formal, reference the contract or terms, and state clearly what happens next (payment plan option, or formal escalation).
Email template:
Subject: Invoice [number] — Overdue Notice
Dear [name],
Invoice [number] for £[amount], due [date], remains unpaid. This is now [X] days overdue. We have attempted to reach you on [dates] without response.
Please contact us within 5 working days to arrange payment or agree a payment plan. If we do not hear from you, we will proceed with formal recovery options, which may include a Late Payment Act charge and referral to a collections agency.
Please reply to this email or call [name] on [number].
[Signature]
Follow the email with a direct phone call the same day. The combination is significantly more effective than email alone.
Trigger: 28–35 days overdue, no agreement reached Channel: Formal letter + email Purpose: Last internal communication before external escalation.
This should be a formal letter (PDF, signed, sent by email and post if the amount warrants it). Reference the Late Payment of Commercial Debts (Interest) Act 1998, which entitles UK businesses to charge 8% + Bank of England base rate on overdue invoices.
Stating this — and the accruing interest — often prompts payment without external escalation.
Options (in order of relationship impact):
| Option | Cost | Relationship impact | Recovery rate |
|---|---|---|---|
| Statutory demand | £303 filing fee | High | Good for solvency threats |
| Small claims court (under £10,000) | £35–£455 | Medium | High if client is solvent |
| Debt collection agency (DCA) | 10–25% of recovered amount | High | Variable |
| Solicitor letter | £50–£200 | Medium–high | Often prompts payment |
Use a solicitor letter before a DCA where possible — it's cheaper, faster, and less damaging to the relationship if the client is solvent and just slow.
Timesheet or rate disputes pause the escalation clock — but only for the disputed amount, not the undisputed portion. If a client disputes one week of hours on a four-week invoice, the remaining three weeks remain overdue and should continue through escalation normally.
Dispute process: 1. Acknowledge the dispute in writing within 24 hours 2. Escalate internally to the placement manager for resolution 3. Set a clear resolution deadline (3–5 working days) 4. If unresolved within 5 days, escalate to a senior contact at the client
A common mistake: pausing all escalation because of a partial dispute. Don't.
Running this manually across 50+ invoices is a full-time job. The typical staffing agency credit controller spends 3–4 days per week on manual chasing — drafting emails, tracking responses, updating spreadsheets.
Equisettle automates every stage of this process: - Syncs with your accounting software (Xero, QuickBooks, Sage, FreeAgent) - Predicts which invoices are likely to go late before Stage 1 even triggers - Runs email, SMS, and WhatsApp sequences automatically at each stage - Flags accounts for manual intervention when automation hasn't resolved the invoice
Finance teams using Equisettle typically reduce credit control admin from 3–4 days/week to under 4 hours.
When should I involve a debt collection agency? After Stage 6 (formal letter) has produced no response. Before that, a solicitor letter is typically cheaper, faster, and less damaging to client relationships.
Can I charge interest on overdue invoices? Yes. Under the Late Payment of Commercial Debts (Interest) Act 1998, UK businesses can charge 8% + Bank of England base rate on late B2B invoices. You can also charge a fixed compensation fee (£40–£100 depending on invoice size). Stating this in your Stage 5 or Stage 6 communication often prompts payment.
How do I handle a client that disputes but won't respond? Continue escalation on the undisputed portion. Send a formal dispute letter requiring a response within 5 working days. If no response, treat as a non-dispute case and escalate to Stage 6.
What's the right tone for escalation communications? Professional and factual throughout. Never apologetic (you're owed the money), never aggressive (damages relationships and reduces recovery). The tone should escalate the formality, not the hostility.
How long should the full process take? From due date to formal escalation: 35–40 days. From formal escalation to external referral: another 10–14 days if no response. Total: 45–55 days from due date to external collections — any longer and recovery rates drop materially.
