Following Up on Unpaid Invoices: A Polite but Firm Escalation Ladder
Most invoices settle at the point the client sees a number that grows every day. The key is systematic escalation: polite at first, increasingly specific, and always referencing the contract clause. Here is a ladder you can follow, with templates.
Last updated 2026-09-17.
The escalation timeline
1Day 1 (day after due date): Polite reminder
Assume it's an oversight. Keep it short, human, and actionable.
7Day 7: Statement of account
Still polite, but now factual. Show the ageing and the accruing interest.
14Day 14: Formal notice (quote the clause)
Now you reference the contract, the exact daily rate, and the total including interest. This is the letter that gets escalated to the person who can actually pay.
30Day 30: Pause further work
If the contract allows (and it should), pause work. This is often what finally triggers payment.
Key principles
- Always reference the invoice number. Makes it trivial for them to find and pay.
- Quote the contract clause. Moves it from “you're asking nicely” to “this is what we agreed”.
- Show the maths. Use the Late Fee Estimator to generate the exact figures. A specific number (GBP 6.03) is far more effective than “interest may be charged”.
- Escalate the recipient. Day 1 → your contact. Day 7 → your contact + CC their manager. Day 14 → finance/accounts payable. Day 30 → director/owner.
- Keep a paper trail. Every email is evidence if you need to pursue formally.
What if they dispute the invoice?
If they raise a genuine query (wrong amount, missing PO, wrong details):
- Acknowledge within 24 hours.
- Fix the error and re-issue with a new invoice number (referencing the old one).
- Reset the due date from the corrected invoice date.
- Interest only accrues from the new due date.
If the dispute is vexatious (they're stalling), the clock keeps ticking on the original invoice. State this in writing.
Payment plans
If they genuinely can't pay in full, offer a plan — but formalise it:
- Written agreement (email is fine) with specific dates and amounts.
- Interest continues to accrue on the declining balance.
- Missed instalment = entire balance immediately due.
- Work remains paused until the plan is signed.
Use the Late Fee Estimator to calculate what interest is fair if the balance is cleared over three months.
When to involve a third party
- Letter before action (LBA): Formal legal letter (you can write it yourself or use a solicitor). Often the final nudge.
- Small claims / money claim online: UK: Money Claim Online (up to GBP 10k). US: Small claims court (limits vary by state). EU: European Small Claims Procedure (up to EUR 5,000).
- Statutory demand (UK): For debts > GBP 750 (company) or > GBP 5,000 (individual). Precursor to winding-up/bankruptcy.
- Debt collection agency: Typically 10–25% of recovered. They chase; you get the rest.
Prevention: the best follow-up is the one you don't need
- Get the PO number before you start.
- Send the invoice the day the work is done (not a week later).
- Put the due date as a calendar date, not “Net 30”.
- State late-payment terms on every invoice.
- Use the Invoice Generator — it prompts for all of the above.
Related guides
- Late Payment Interest: Simple vs Compound, Grace Periods, and Flat Fees
- Payment Terms That Get You Paid Faster
- Freelance Contract Essentials: What to Include Before You Start
Try the estimator
Open the Late Fee Estimator. Enter the principal, rate, days overdue, grace period, and flat fee — it generates the exact figures for your formal notice.
This guide provides practical escalation templates. It is not legal advice. Debt recovery procedures, limitation periods, and enforcement options vary by jurisdiction. Take advice before pursuing formal action.