When a client pays late: what to do in the first 48 hours

An invoice goes past due and the first instinct is to send a firmer email. That is usually the wrong first move, not because firmness is bad, but because it is the third step wearing the costume of the first. The first forty-eight hours are about information, not pressure. Get the facts and most late payments resolve themselves before anyone has to be difficult.

Hour one: confirm the invoice actually arrived

Before anything else, check that the invoice was delivered to a human being and not to an accounts-payable black hole. A surprising share of "late" invoices were never received, were sent to a former employee, or landed in a spam folder because the domain is new. Pull the delivery record. If it bounced or went unopened, resend to a named person with the invoice attached as a PDF, not as a link that requires a login.

While you are there, confirm the invoice is correct. Wrong PO number, wrong billing entity, wrong amount, missing remit-to details. Any of those will park an invoice in a queue indefinitely while nobody tells you why. An invoice that is wrong is not late, it is broken, and chasing it harder just annoys the person who already knows it is broken.

Hour two: check the contract, not your memory

Net 30 is a habit, not a law. Open the agreement and read the payment terms, the billing contact, and the dispute window. If the contract says net 45 and you have been assuming net 30, you have been sending reminder emails about a payment that is not yet due, which trains the client to ignore your reminders. If the contract is silent, the terms on your invoice govern, which is one more reason the invoice should state them plainly.

This is also the moment to check whether the client has a formal dispute process. Some larger companies require disputes in writing within a set number of days or the invoice is deemed accepted. Knowing that changes your timeline completely, because a quiet client is not necessarily a slow client.

Hour three: one call, not five emails

If the invoice was received, correct, and past terms, pick up the phone. Not to demand payment, but to ask a specific question: is this scheduled, or is something holding it up? Those are different problems with different fixes. If it is scheduled, you have a date and you can stop worrying. If something is holding it up, you find out what, and it is usually a missing approval or a mismatched PO that takes ten minutes to resolve.

Email is a poor tool for this because it is easy to defer. A two-minute call gets a real answer. Follow the call with a short email summarizing what was agreed and when payment will run, so there is a written record. That email is also the thing you will point to if the date slips again.

What not to do in the first forty-eight hours

Do not threaten. Do not escalate to the client's executive sponsor. Do not stop work without telling anyone. And do not, under any circumstances, re-send the same invoice a fourth time with a red "OVERDUE" banner and hope that does it. Escalation is a tool you get to use once per relationship, and spending it on day two leaves you with nothing on day forty-five.

The reason this matters beyond one invoice is cash flow. Late payments are not a collections problem, they are a predictability problem. If you know within two days whether an invoice is scheduled or stuck, you can forecast the month with some confidence. If you spend three weeks sending emails into the void, you are guessing, and guessing is what makes a profitable month feel like a crisis.

The system that prevents the next one

Two small habits remove most of this work. First, invoice on the first business day of the period, not whenever you get to it, because every day you delay is a day added to the tail. Second, put the payment terms, the remit-to details, and a named billing contact directly on the invoice. The goal is that a stranger in accounts payable can pay you without emailing anyone, including you.

When a client is consistently late despite all of that, the answer is not better chasing. It is a deposit, a shorter term, or a card on file. That is a commercial conversation, and it is a much easier one to have before the invoice is late than after.