Guides

How to Follow Up on an Unpaid Invoice

Most late invoices are forgotten, lost or waiting on someone. A friendly, steady schedule gets them paid. Here's one, with emails to copy.

6 min read · Updated October 20, 2026

First, Check the Basics

Before you chase, make sure the invoice went to the person who pays, has the right purchase order number if they use one, and shows a due date and a way to pay. Many “late” invoices are stuck on one of these.

A Follow-Up Schedule

Follow-up schedule
WhenWhat
3 days before the due dateA friendly heads-up with the link or PDF
On the due dateA short note that it's due today
7 days lateAsk whether anything is holding it up
14 days lateA firmer note, and a phone call
30 days lateFinal notice: the late fee, and a pause on new work

Emails to Copy

3 days before · Subject: Invoice 1042 due Friday

Hi Dana, a quick heads-up that invoice 1042 for $2,400 is due this Friday, October 23. You can pay it here: [link]. Thanks!

On the due date · Subject: Invoice 1042 due today

Hi Dana, invoice 1042 for $2,400 is due today. Here's the link again: [link]. Let me know if you need anything from me.

7 days late · Subject: Invoice 1042 is past due

Hi Dana, invoice 1042 for $2,400 was due last Friday and I don't see a payment yet. Is anything holding it up, or should it go to someone else? [link]

14 days late · Subject: Invoice 1042: 14 days past due

Hi Dana, invoice 1042 for $2,400 is now 14 days past due. Could you let me know when it will be paid? I'll give you a call tomorrow to sort it out. [link]

30 days late · Subject: Final notice: invoice 1042

Hi Dana, invoice 1042 for $2,400 is 30 days past due. As in our agreement, a late fee of 1.5% ($36) now applies, and I'll pause new work until the account is current. Please pay here: [link].

Keep the Tone Steady

  • Assume it's an oversight until you learn otherwise.
  • Include the invoice number, amount, due date and pay link every time.
  • Keep each message short, and reply in the same thread so the history stays together.
  • Call when email goes quiet. A two-minute call often finds the real problem.

After 30 Days

Apply the late fee your terms allow (the Late Fee Calculator works it out), pause new work, and offer a payment plan if the client is struggling. For a large balance that stays unpaid, a collections service, small claims court or a lawyer can advise on the options where you are.

Questions

How Long Should I Wait Before Following Up on an Invoice?

Send a heads-up a few days before the due date and a note on the day. If nothing arrives, follow up a week after the due date.

Can I Charge a Late Fee if It Wasn't in My Agreement?

It's much harder. A late fee works best when it's agreed in advance and printed on the invoice. Add it to your terms for future work.

Should I Keep Working for a Client Who Hasn't Paid?

Once an invoice is well past due, pausing new work is common and usually written into agreements. Finish what's already paid for, and tell the client when work will resume.

What's the Best Way to Prevent Late Payments?

Agree on terms up front, take a deposit, send invoices promptly to the person who pays, include a pay link, and automate reminders.