The money is late. Here's the ladder that collects it.
An unpaid invoice is rarely a lost cause — it's usually an unmanaged one. What collects the money is a predictable escalation: remind, follow up, attach consequences, then make it formal. Here is each rung of that ladder, with the timing, the exact wording, and the point where chasing stops being worth your time.
Escalation timeline · Late-fee wording · Letter of demand template
Age is the enemy — The older an invoice gets, the harder it is to collect — contacts change jobs, disputes get fuzzy, and small debts slide down priority lists. Start the ladder the day after the due date, not the day you get angry.
Copy these, swap the brackets for your details, and send.
Payment is due within [14] days of the invoice date. Overdue amounts incur a late fee of [$25, or 2% per month] from the due date until paid. Work may be paused on accounts more than [30] days overdue.
Subject: Invoice [#0001] — late fee applied Hi [Name], As set out in the payment terms on invoice [#0001], a late fee of [$fee] has now been applied, bringing the total due to [$new total]. An updated invoice is attached. I'd rather waive the fee than collect it — pay the original amount by [date] and I'll take it straight off. Thanks, [Your name]
LETTER OF DEMAND [Your business name] [Date] To [Client name / business], This letter is a formal demand for payment of [$amount], owing under invoice [#0001] dated [date] and now [60] days overdue. Previous requests for payment were sent on [dates]. If full payment is not received by [date — 7 to 14 days from today], I intend to pursue recovery through [small claims court / a collection agency] without further notice. Costs and interest may be added where the law allows. Payment can be made by [methods]. If any part of this debt is disputed, set out the dispute in writing by the same date. [Your name] [Contact details]
Send a short, friendly reminder with the invoice attached and the payment details restated. Most overdue invoices are buried, not disputed — this step alone collects the majority.
A firmer note: state the days overdue, ask when payment will be made, and mention the late fee your terms allow. Still polite — but the invoice now visibly has a cost attached.
One message: the amount, a new deadline, and exactly what happens next — late fee applied, further work paused, the account passed to formal recovery. Then do what you said.
A formal written demand (a demand letter in the US) states the debt, the deadline and your intent to pursue court or collections. It's often the first thing a non-paying client takes seriously — and the document a court expects to see.
Small claims court handles invoice-sized debts cheaply and without a lawyer in most places; collection agencies need no court date but keep a cut. Weigh the amount against the fees and your time — and stop chasing debts that cost more than they're worth.
InvoiceSonic tracks what's outstanding, shows you the moment an invoice is opened, and sends the reminders on schedule — you only step in at the formal end.
Start freeResend it with a short, friendly reminder the day after the due date — attach the invoice, restate how to pay, and ask if anything is holding it up. Most overdue invoices are forgotten rather than refused, so the first step assumes good faith, and it collects most of them.
Only if your payment terms said so before the work started — a fee invented after the fact is unenforceable and reads as punitive. A fixed fee or a small monthly percentage stated on every invoice is standard, and its real value is leverage: offering to waive it for immediate payment often works better than collecting it.
A formal written demand for the debt: the amount, the invoice it arises from, a deadline, and your stated intent to pursue court or collections if it stays unpaid — in the US it's usually called a demand letter. It signals the matter is becoming legal, which is why it often produces payment when reminders didn't, and courts expect to see that one was sent.
For debts from a few hundred to several thousand dollars, often yes: filing fees are modest, you don't need a lawyer, and many cases settle as soon as papers are served. Check your local claim limit, weigh the fee and a day of your time against the amount — and remember that winning a judgment still requires the client to have the money.
When the ladder is exhausted and the amount justifies losing the commission — agencies typically keep a meaningful percentage of whatever they recover. They suit older debts you've already written off emotionally; for fresher, larger debts, a letter of demand followed by small claims usually recovers more of the money.
Shorter payment terms (7 or 14 days rather than 30), a deposit on anything substantial, payment details on the invoice itself, and automatic reminders from day one. An invoice sent promptly, with clear terms and a scheduled chase behind it, rarely reaches the ladder on this page.
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