Quick answer

An effective invoice follow-up email contains four things:

1. the invoice reference;

2. the amount;

3. the due date;

4. one clear question or requested action.

Here are six templates for different stages.

1. Before the due date

Subject: Invoice #214 — payment due September 14

Hi [Name],

A quick check ahead of the due date for invoice #214 on September 14.

Could you confirm everything is in place for payment, or let me know if finance needs anything else from us?

Thanks,

[Name]

2. On the due date

Subject: Invoice #214 due today

Hi [Name],

Invoice #214 for [amount] is due today.

Could you confirm whether payment is scheduled, and the expected payment date if it hasn’t been released yet?

Thanks,

[Name]

3. First overdue follow-up

Subject: Invoice #214 — payment status

Hi [Name],

Following up on invoice #214 for [amount], due September 14.

We haven’t received the payment yet. Could you check its status and confirm the scheduled payment date?

If someone in finance or AP is handling it directly, feel free to connect us.

Thanks,

[Name]

4. When “finance is handling it”

Subject: Re: Invoice #214

Thanks, [Name].

Could you please introduce me to the person in finance/AP handling invoice #214?

I’ll coordinate with them directly so you don’t need to stay in the middle.

Thanks!

5. After a promised payment date passes

Subject: Invoice #214 — September 21 payment

Hi [Name],

Following up on invoice #214.

We had payment scheduled for September 21, but it hasn’t reached us yet.

Could you check what is holding it up and confirm the revised payment date?

Thanks,

[Name]

6. Escalation

Subject: Action required — invoice #214

Hi [Name],

Invoice #214 for [amount], originally due September 14, remains unpaid.

We’ve followed up on [dates], and the previously confirmed payment date of September 21 has also passed.

Could you please confirm today:

• whether the invoice has been fully approved;

• whether anything is blocking payment;

• the date payment will be released.

I’m copying [stakeholder] for visibility so we can get this resolved.

Thanks,

[Name]

One principle matters more than the wording

Do not keep sending progressively angrier versions of the same email.

Every follow-up should move the process forward.

Get a contact.

Get a date.

Identify a blocker.

Escalate ownership.

That is payment operations—not simply “sending reminders.”

FAQ

Should I attach the invoice again?

Usually yes. Remove unnecessary friction.

Should I mention late fees?

Only if they were part of your agreed terms and you actually intend to enforce them.

Should I call the client?

Yes, when email is no longer producing new information.

What if I don’t want to send these myself?

Collected42 can step into your existing payment thread and own the follow-through—reminders, calls, payment dates, AP contacts and escalation—while you stay focused on the client work.