The job finished five weeks ago. The invoice went out the same day, or nearly. Since then you have sent three messages, each one slightly more apologetic than the last, and the most recent one you rewrote twice before sending because you did not want to sound rude.
Meanwhile you paid your supplier on time. You paid your staff on time. So what has actually happened is that you took out a loan on behalf of your customer, at no interest, without being asked, and you are now embarrassed about mentioning it.
That is the part worth sitting with. The awkwardness is entirely on the wrong side of this transaction, and almost every part of the problem is fixable before the work starts rather than after.
By the end of this guide you will have terms you say out loud before you begin, an invoice nobody can use as an excuse, a five-step reminder sequence with the exact words, a rule for when you stop supplying, and a method for recovering money that is already old. The whole system runs on a phone and a notebook.
(Written for any country. Money appears as plain numbers, read them in your own currency. Where local law decides something, late payment interest, small claims limits. I say so, because it varies and you should check yours.)
What being paid late actually costs
People treat late payment as an irritation. It is a cost, and it is bigger than it looks. Take one invoice of 100,000, paid 60 days late.
| What the delay costs | Amount |
|---|---|
| Cost of the money for 60 days (say 3% a month) | 6,000 |
| Your time chasing: 3 hours at 800/hr | 2,400 |
| One order you could not fund while waiting | margin lost on that order |
| Bank charges or overdraft to bridge it | varies |
On a job with a 15% margin, the first two lines alone have taken more than half the profit. If you are on a 10% margin and routinely paid two months late, you are working for free and covering the cost of it.
There is a second cost that never appears anywhere. Late payers train you to stop selling. When you are short of cash you do not buy stock, you do not take the bigger job, you do not hire the extra pair of hands. The business gets smaller quietly, and it looks like caution rather than what it is.
Four reasons customers pay late, and four different fixes
Almost every late payment is one of these. Getting the diagnosis right matters, because the wrong fix makes it worse.
One: nobody ever agreed a date. You said "settle it when you can" or you said nothing. There is no lateness, because there was no due date. This is the most common cause by a wide margin, and it is entirely yours to fix.
Two: the invoice is wrong, missing, or unusable. No reference, wrong amount, sent to a person who left, no payment details, a photo of a handwritten note that their system cannot process. They are not refusing. Nothing has reached the place where money comes from.
Three: you are not in their payment process. Larger customers pay on fixed days, from approved invoices, matched to a purchase order. Miss the cut-off or the reference and you sit in a pile until next month. This is not personal and no amount of chasing the person you know will fix it.
Four: they cannot pay. Genuinely short of money, or in trouble. This is the only one of the four where chasing harder can make things worse, and the only one where the right move is a payment plan and a hard stop on further supply.
Before you do anything else, take your oldest unpaid invoice and decide which of the four it is. Then look at the next three. If most of them are reason one or two, you do not have difficult customers. You have a paperwork problem, and it is about to get solved.
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