An unpaid invoice is a job you finished and a customer who still has your money. Chasing it is not rude — it's the last step of the delivery. The ladder that works is short, scheduled, and boring: a friendly reminder on day one, a direct follow-up on day fourteen, a phone call on day thirty, a final notice on day forty-five.
Why late invoices are a business you run for free. Say the average small business carries $18,000 in overdue receivables at any moment. That is stock you bought, hours you worked, fuel you burned — financed by you, interest-free, indefinitely. Every dollar of it is your own line of credit, extended by accident, to a customer who is almost certainly paying someone else on time this very week.
The ladder: four letters, three dates, one thread.
- Day 1 — the friendly reminder. Assumption-first: it's in the queue, something crossed. One paragraph, invoice number, amount, due date, payment details again. Sent the day after due, never the day after you sent the invoice.
- Day 14 — the direct follow-up. "Showing unpaid on my side" becomes "still showing unpaid." Ask the question that requires an answer: is there something holding it up on your side?
- Day 30 — the phone call. Letters archive; a call is a conversation. Ask when it will be paid, get a date, write the date down, confirm by email within the hour.
- Day 45 — the final notice. Brief, factual, terminal: pay by [date] or the account goes on hold and the matter moves to collections. State the stop-work rule once, calmly, and mean it.
The rules that make chasing work. One invoice, one thread — every letter replies to the original invoice email. Re-attach the payment rails in every letter; a surprising share of late invoices are late because the details were in the attachment nobody opened. Chase the process, not the person ("it's showing unpaid on my side" blames the ledger, not the customer). Never apologise for the invoice — "sorry to bother you" teaches the reader the invoice is a bother. And stop work is stated once, then enforced; enforcement is what makes the next invoice pay in seven days instead of sixty.
The telephone step. On day thirty, call. Open with the account, not the accusation: "Invoice 1041's showing unpaid on my side; can you see it in your queue?" Then the only question that matters: "When can I expect it?" Whatever date you hear is the date you write down and confirm by email. If the answer is "we're all behind this month," offer the split in writing — half now, half in two weeks. A partial payment this week beats a full payment in a court in spring.
Disputes are different work. A customer who says "we're not paying this line" has stopped being a collections case and started being a dispute: pull the quote, walk the job, agree the number line by line, take the agreed money now, and keep chasing only the contested piece. Silence is not a dispute — a customer who goes quiet on day 20 without naming an issue is a cash-flow case, and it belongs on the ladder exactly as written.
Stopping the next late payer before the invoice goes out. Deposit on first jobs (fifty percent before the van rolls). Short terms for strangers — seven days on a first job, longer once they've paid on time once. The late-fee clause printed on the invoice itself: you may never charge it, but its existence moves you up the queue of payees. And invoice the same day — the job invoiced Friday gets paid in the fortnight that remembers it.
Worked example: the plumber's $11,400 answer. A one-van plumbing business chased "when things were quiet," which meant never. Nine overdue invoices, some past ninety days, $11,400 total. He wrote the four letters once, loaded each due date into a two-line spreadsheet, and started each invoice at whatever day it had actually reached. Six of nine paid within three weeks — two of them the same afternoon the day-1 reminder landed, because payment had been approved and never processed. One settled as a written split. The last went to collections. The business now invoices same-day, takes deposits, prints the late-fee clause — and its overdue balance on any ordinary Tuesday is under a thousand dollars.
The full page — with the four letters drafted as templates and the aging-report discipline that feeds the ladder — lives on Ops notes: overdue invoice letters.
More free small-business ops checklists at Ops notes. If you run an on-call roster or incident process, the First 30 Minutes checklist is free, and the Ops Starter Kit covers the rest.
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