How to Follow Up on an Unpaid Invoice
Most late payments aren't deliberate — they slip through because clients are busy, invoices get buried, or payment processes are slow. A structured follow-up sequence gets most overdue invoices paid without damaging the relationship. Here's exactly how to do it.
The 5-step follow-up sequence
The 80% rule
About 80% of late payments are resolved at step 1 or 2 — the client simply forgot. Keep your first two reminders short and non-accusatory. Save the formal tone for step 4+.
Copy-paste email templates
Reminder #1 — Due today
Send on the due date
Subject:
Invoice INV-042 due today — [Your Name]
Body:
Hi [Client name], Just a quick note that Invoice INV-042 for $[amount] is due today. You can view and download the invoice here: [invoice link] If you've already sent payment, please ignore this — and let me know the reference number so I can confirm receipt. Thanks, [Your name]
Reminder #2 — 7 days overdue
Send 7 days after due date
Subject:
Invoice INV-042 — 7 days overdue
Body:
Hi [Client name], I wanted to follow up on Invoice INV-042 for $[amount], which was due on [due date] and is now 7 days overdue. Could you let me know when I can expect payment, or flag if there's any issue on your end? Invoice link: [invoice link] Thanks, [Your name]
Reminder #3 — 14 days overdue
Send 14 days after due date
Subject:
Second notice: Invoice INV-042 overdue
Body:
Hi [Client name], Invoice INV-042 for $[amount] is now 14 days past due. I've sent two previous reminders and haven't received payment or a response. Could you please confirm your expected payment date? If there's a dispute or an issue with the invoice, let me know and I'm happy to discuss it. Invoice: [invoice link] [Your name]
Reminder #4 — 30 days overdue
Send 30 days after due date — escalate
Subject:
Invoice INV-042 — 30 days overdue, please respond
Body:
Hi [Client name], Invoice INV-042 for $[amount] is now 30 days past the due date. I've reached out several times without response. Please reply by [date 7 days from now] with either payment confirmation or a clear timeline for payment. If I don't hear back, I'll need to consider formal options for recovering this debt. I'd prefer to resolve this directly — please get in touch. [Your name]
Final notice — 45+ days overdue
Send 45+ days after due date
Subject:
Final notice — Invoice INV-042
Body:
Dear [Client name], This is a final notice regarding Invoice INV-042 for $[amount], which has been outstanding for [X] days. If I do not receive payment or a confirmed payment arrangement by [specific date], I will pursue recovery through [small claims court / a debt collection agency / legal action]. Payment can be made via [payment details] or by replying to arrange an alternative. [Your name]
What to do if they still don't pay
If you've completed the 5-step sequence and still haven't received payment or a response, you have several options:
Small claims court
US: up to $10,000–$25,000 depending on state. UK: up to £10,000 through Money Claim Online (MCOL). Filing costs £35–£455 in the UK, typically $30–$100 in the US. Fast and doesn't require a lawyer.
Debt collection agency
They take a percentage (typically 20–40%) of the recovered amount. Best for debts you've given up on recovering yourself. It's not worth using for small amounts.
Statutory demand (UK)
For debts over £750 owed by a company. A formal legal notice that can lead to winding-up proceedings if unpaid within 21 days. Powerful but expensive — consult a solicitor.
Invoice factoring
Sell your overdue invoice to a factoring company at a discount (typically 80–90% of face value) in exchange for immediate cash. Useful for large invoices from otherwise creditworthy clients.
How to prevent late payments in the first place
Require a deposit before starting work
30–50% upfront means you're never chasing 100% of an invoice. Clients who pay deposits are serious clients.
Use shorter payment terms
Net 30 is the default but Net 14 or Net 7 is fine — most clients will accept it. Fewer days = less time for invoices to get buried.
Send invoices immediately on completion
Don't batch invoices or wait until month-end. The sooner you invoice, the sooner the payment clock starts.
Send a shareable link, not just a PDF attachment
A link in the email is harder to lose than an attachment. SwiftBill generates a public link for every invoice automatically.
Add a late fee clause to your contracts
'Invoices unpaid after 14 days will incur a 2% monthly late fee.' Even if you never enforce it, it signals you take payment seriously.
Tone guide: how formal to be at each stage
The biggest mistake freelancers make is going straight to aggressive language on the first reminder. Here's how to calibrate:
- • Steps 1–2: Treat it like a friendly admin task, not a confrontation. Most clients are just busy.
- • Step 3: Shift from friendly to businesslike. Ask directly for a response or payment date.
- • Step 4: Set a clear deadline. “Please respond by [date]” — not open-ended.
- • Step 5: State consequences clearly but without anger. “I will pursue this through small claims court” — not “I'm going to destroy you.”
Track which invoices are paid — free
SwiftBill tracks payment status for every invoice. Know exactly what's overdue without digging through email.