An unpaid invoice is stressful, but the first message is rarely a confrontation. Most late payments are an overlooked email, a missing purchase order or a finance team on holiday.
Before you write: check the basics
- Did the invoice reach the person who pays? Try the finance contact, not only your project lead.
- Is the due date really past? Count from the invoice date and the terms you agreed.
- Is anything missing, such as a purchase order number or a tax ID?
The day after it was due
“Hi Sam, a quick reminder that invoice 0042 was due yesterday. I have attached it again in case it was missed. Thanks!”
A week late
“Hi Sam, invoice 0042 is now a week overdue. Could you tell me when it is scheduled for payment? If anything is holding it up, I am happy to fix it today.”
A month late
“Hi Sam, invoice 0042 is now 30 days overdue. I need to pause further work until it is settled. If a call would help, I can do any time this week.”
When to stop working
If a client is a month behind and unresponsive, pausing work is reasonable and professional. Put it in writing, keep the tone calm, and keep the invoice attached to every message. For larger sums, a written contract and local small-claims or legal advice are the next step.
Make the next one easier
Shorter payment terms, a deposit up front and a clear payment link on every invoice prevent most of this. Wizard Invoice Pro can also send the reminders for you, so you are not the one who has to write the awkward email.
