Most overdue invoices are not refused, they are forgotten. The ladder below is what to send on day 1, 7, 14, 30 and 45, and how to escalate without torching a client you want to keep.
Chasing money is the part of running a small business nobody teaches. It feels rude, so it gets delayed; delayed chasing turns a two-week invoice into a sixty-day problem; and by the time the message is finally sent it is written by an anxious person rather than a calm one, which is exactly when it reads badly.
The way out is to make the sequence mechanical. Decide the wording once, put the dates in your calendar, and stop making a fresh emotional decision every time an invoice goes unpaid.
The ladder: what to send, and when
Five steps cover almost every domestic and small commercial invoice. Each one assumes the previous was delivered and read.
- Day 0, before the due date. The invoice itself, with the due date stated, the amount, and a payment reference. This is not a chase, it is the foundation: most late payments are late because the invoice was unclear or went to the wrong inbox.
- Day 1 after due. A one-line nudge, friendly, no accusation. The assumption is that it slipped through, which is usually true.
- Day 7. A short email restating the amount and the original due date, asking for a payment date rather than a payment. Asking for a date gets a commitment; asking for money gets silence.
- Day 14. Firmer. Reference the terms, state that you will pause further work if there is any scheduled, and repeat the payment details so nobody has an excuse about bank details.
- Day 30 and beyond. A final notice with a stated deadline and a stated consequence that you are actually prepared to carry out.
The mistake at nearly every stage is the same: writing to express how you feel about being owed money. The client already knows the invoice is unpaid. What they need is the amount, the reference, and one clear action.
Why polite early beats firm early
A firm message on day 1 costs you goodwill with the client who simply forgot. A polite message on day 45 costs you the money, because it signals that nothing happens if they wait. The sequence works because the pressure comes from the calendar, not from your tone.
That is also why the escalation has to be real. If your day 30 letter says work will pause and work never pauses, you have told the client that your letters are noise. Decide the consequence before you write it, then keep it.
The first nudge, written properly
Two sentences do the whole job. Mention the invoice, mention the amount, attach it again, and stop. Do not apologise for asking, and do not soften it into a question about whether they received it.
The reusable prompt
You are helping a small business owner write a payment reminder. Client: [name] Invoice: [number], [amount], for [what you did], issued [date], due [date], now [number] days overdue Relationship: [long-standing domestic client / new commercial client] Payment details: [bank details or payment link] Write an email under 90 words that: - includes a subject line that names the invoice number and amount - assumes it simply slipped through, without saying so - states the amount, the invoice number and the due date in one sentence - asks for a specific payment date, not just "payment" - re-attaches or re-links the invoice - no apology for chasing, no "just", no "sorry to bother you", no threats, no exclamation marks
That last instruction matters more than it looks. The word “just” is a tell that you expect to be refused, and clients hear it.
When they say they never received it
Sometimes that is true. Inboxes reject attachments, invoices go to spam, and a bookkeeper files things in the wrong place. The response is not to argue about delivery, it is to remove the friction: resend as a link as well as an attachment, confirm the address, and ask for the date they expect to pay.
If it happens twice with the same client, the problem is not the invoice, it is the process. Switch that client to a payment link in the original message and a documented due date, and keep the evidence.
Prompt for the second chase
Write the second payment reminder for the same invoice, seven days after the first reminder. Facts: invoice [number], [amount], originally due [date], first reminder sent [date], client replied [their reply, or "no reply"]. Rules: under 110 words, restate the amount and original due date, ask for a specific date, offer the payment link again, mention that work on any future scheduled jobs will pause until the account is clear only if I tell you to include that line. No threats, no legal language, no sarcasm, no invented deadlines.
The final notice, and the line you cannot uncross
Escalation is a decision, not a sentence. In most places the realistic options are a formal letter before action, a small claims process, or writing the debt off and refusing further work. Those have different costs in time and goodwill, and the amount owed should decide which one you choose, not your temper.
Whatever you choose, it should be stated once, in writing, with a date. Then either do it or drop it. A threat you do not carry out teaches a client that your deadlines are decorative.
Prompt for a final notice
Draft a final payment notice for a small business. Owed: [amount], invoice [number], due [original date], now [days] overdue, [number] reminders sent Consequence I will actually carry out: [e.g. refer the debt to a collections process / pause all work / proceed to small claims] Deadline I am giving: [date, e.g. 7 days] Rules: under 140 words, factual and calm, no legal threats beyond the one consequence stated, itemise what was delivered, restate payment details, state that the matter will be treated as a debt recovery after the deadline, sign off without hostility. Do not invent statute names or reference laws.
Note the instruction not to invent statutes. Language models will happily produce a confident paragraph about the Late Payment of Commercial Debts Act whether or not it applies to your client, and a wrong legal reference in a final notice is worse than a plain one.
Prevention beats every script
The cheapest chase is the invoice that was never late. Three habits do most of the work:
- Invoice the day the job finishes. Every day you delay is a day of enthusiasm the client loses.
- State terms once, in writing, before the job. Deposit for materials, balance within seven or fourteen days, in the quote rather than on the invoice.
- Ask for a deposit on anything material-heavy. It filters out the clients who were never going to pay promptly, and it means the worst case is a partial loss.
The invoice generator handles the document and the arithmetic, including the deposit already paid. What it cannot do is decide your terms, which is the part that determines whether you spend Friday afternoon sending the messages above.
If the problem is that invoices themselves take too long to produce, that is a different fix: the bookkeeping guide covers where AI helps with the paperwork and, more usefully, where it quietly makes things worse.
Frequently asked questions
How soon should I chase a late invoice?
The day after the due date, with a friendly one-liner. Early politeness costs nothing and catches the genuine oversights before they become habits. Waiting a fortnight to seem reasonable is how a fourteen-day term becomes a sixty-day one.
Should I charge late payment interest?
Only if it was in your terms before the job started, and only if you intend to enforce it. Added after the fact it reads as punishment and rarely gets paid. Many small businesses find a pause on further work is more effective than interest, because it affects the client immediately.
Is it unprofessional to send reminders automatically?
No, provided the message is specific and human. “Invoice 1043 for 840, due 3 November, is now seven days late. Could you confirm a payment date?” reads as organised. A generic “your invoice is overdue” reads as a machine, and clients treat it accordingly.
What if the client is a good customer who is having a hard time?
Say so and set a date anyway. “I understand things are tight. Can we agree 200 on the 15th and the balance on the 30th?” A payment plan with dates protects the relationship and the cash. A payment plan without dates is a write-off with paperwork.
Can AI write the whole chase sequence for me?
It can draft all five letters in a few minutes, and that is genuinely useful because it removes the emotional cost of starting. What it cannot do is decide your terms, your consequence, or whether this client is worth keeping. Those three decisions are the ones that actually collect money.
Last reviewed and updated on November 10, 2026.
