Guide

Past due invoice email: 6 templates by days overdue

Copy six past due invoice email templates, from a friendly nudge to a final notice, with subject lines, timing by days overdue and tips on tone.

Updated Nov 5, 2026 · By PayToMe Editorial

A past due invoice email is a short, polite message that tells a client an invoice has passed its due date and asks for payment by a specific date. Send the first one within one to three days of the due date, keep it factual, attach the invoice and a payment link, and raise the tone gradually. Below are six templates by days overdue.

Why a good email matters more than a clever one

Most unpaid invoices are not disputes. The invoice went to a shared inbox, the approver is on leave, the purchase order number was missing, or the bill was simply forgotten. A clear email that makes it easy to pay solves all of those. A hostile email solves none of them and can cost you the client.

Good past due emails share five traits.

Specific. They name the invoice number, the amount, the original due date and the days overdue.
Short. Four to six sentences. The client should see the request without scrolling.
Easy to act on. The invoice is attached, and a payment link or bank details are in the body.
Dated. They ask for payment by a particular day, not “soon.”
Calm. They assume a mistake until you have a reason not to.

The tone ladder

Think of reminders as a ladder. Each rung is a little firmer than the last, and you only climb when the previous rung brought no reply.

Days overdue	Rung	Goal	Channel
1 to 3	Friendly nudge	Fix the oversight	Email
7 to 10	Polite follow-up	Confirm receipt and a pay date	Email
14 to 21	Firm reminder	Get a committed date	Email plus a call
30	Formal notice	State terms and consequences	Email, copy the approver
45	Final warning	Set a last date before escalating	Email and letter
60	Last notice	Announce the next step	Email and a call

These timings are a starting point. If your terms are net 7, compress them. If the client is a large company with a slow approval chain, start with a phone call to learn how their process works.

Template 1: Friendly nudge (1 to 3 days overdue)

Subject: Quick reminder: Invoice INV-0142 was due on March 3

Hi Jordan,

A quick note that invoice INV-0142 for $1,850.00 was due on March 3 and I have not seen the payment yet. I have attached a copy and you can pay online here: [payment link].

If it has already gone out, thank you, and please ignore this. If anything is holding it up, such as a PO number, let me know and I will fix it today.

Thanks, Priya

Why it works: it assumes good faith, offers help and makes payment one click.

Template 2: Polite follow-up (7 to 10 days overdue)

Subject: Following up on invoice INV-0142 (7 days past due)

Hi Jordan,

I am following up on invoice INV-0142 for $1,850.00, which is now 7 days past due. Could you confirm that it arrived and let me know when I can expect payment?

Pay online: [payment link]. Bank details are on the attached invoice.

If there is a question about any line item, I am happy to talk it through.

Best, Priya

The ask has changed from “please pay” to “please tell me when.” Getting a date turns a vague delay into a promise you can check.

Template 3: Firm reminder (14 to 21 days overdue)

Subject: Payment needed: INV-0142 is 14 days overdue

Hi Jordan,

Invoice INV-0142 for $1,850.00 is now 14 days past its due date of March 3, and I have not had a reply to my earlier messages.

Please arrange payment by Friday, March 21. If payment cannot be made by then, please tell me the date it will be sent.

Pay online: [payment link].

I will also try you by phone this week. Thank you for sorting this out.

Priya

The deadline is concrete and the next step (a phone call) is announced. Make the call. A two-minute conversation often finds the real cause.

Template 4: Formal notice (30 days overdue)

Subject: Formal notice: INV-0142, 30 days overdue

Dear Jordan,

Invoice INV-0142 for $1,850.00 was due on March 3 and remains unpaid after 30 days. Under the payment terms in our agreement dated January 12 (net 15), payment was due within 15 days of the invoice date.

Please pay in full by March 28. [If your terms include it: As stated in our agreement, a late fee of 1.5% per month applies to overdue balances. A fee of $27.75 has been added for the first month. An updated invoice is attached.]

If there is a dispute, please tell me in writing before that date so we can resolve it.

Regards, Priya Nair, Nair Design Studio

This one cites the contract and copies the person who approves payments. Use the late fee sentence only if the client already agreed to it in writing.

Template 5: Final warning (45 days overdue)

Subject: Final reminder before escalation: INV-0142

Dear Jordan,

Invoice INV-0142 for $1,850.00 is now 45 days overdue. Despite several reminders, I have not received payment or an explanation.

If payment is not received by April 4, I will pause further work under our agreement and begin the recovery steps described in our terms, which may include referring the account to a collections service or taking legal advice.

I would much prefer to resolve this directly. Please call me at [number] or pay here: [payment link].

Priya Nair

Only list consequences you are actually prepared to carry out, and only those your contract allows. Empty threats teach the client that deadlines are optional.

Template 6: Last notice (60 days overdue)

Subject: Last notice: INV-0142 will be passed for recovery on April 20

Dear Jordan,

This is my last notice about invoice INV-0142 for $1,850.00, now 60 days overdue. If I do not receive payment or a written payment plan by April 20, I will move the account to the next stage of recovery.

A payment plan with weekly installments is still possible if you contact me before that date.

Priya Nair

Offering a payment plan at the end gives the client a face-saving way to pay and gives you money sooner than a dispute would.

A worked example

45 days late, with and without a fee

Priya sends INV-0142 for $1,850.00 on February 16 with net 15 terms, so it is due March 3. Her contract says a late fee of 1.5% per month, simple interest, applies to overdue balances.

March 4: Template 1 goes out. No reply.
March 10: Template 2 goes out. Jordan replies that accounts payable never received it. Priya forwards it to the right address.
March 24: still unpaid. Priya sends Template 3 and calls. Jordan promises payment by March 31.
April 17 is 45 days after March 3. The fee for 45 days is 1,850.00 x 1.5% x (45 / 30) = 41.63 dollars, rounded to the cent. Because the contract allows it, Template 5 mentions the fee and attaches an updated invoice for 1,891.63.

If the contract had no late fee clause, Priya would send the same email without the fee and keep the focus on a pay-by date. Adding a fee that was never agreed is the fastest way to turn a slow client into a disputing one.

What to put in every past due email

Use a clear subject line. Include the invoice number and how late it is. Subject lines that look like newsletters get ignored.
Name the invoice. Number, amount, original due date and days overdue, in the first two sentences.
Attach the invoice and add a payment link. Do not make the client hunt for either.
Ask for one specific action by one specific date.
Offer help. Ask whether a PO number, a different billing contact or a line-item question is the blocker.
Sign with your full name and a phone number. It signals that a real person is waiting.

Mistakes that cost you the payment

Waiting too long to send the first one. Silence suggests the date does not matter.
Sounding angry. Anger gives the client a reason to argue about tone instead of paying.
Sending only emails. After the second reminder, call. People answer calls they ignore in writing.
Forgetting the approver. The person who got the invoice may not be the person who pays it.
Inventing fees or threats. Fees need a prior agreement, and consequences need a contract clause or a real plan.
Changing the amount. If a fee is added, issue an updated invoice so the paper trail is clean.
Not recording the conversation. After a call, send a one-line email: “Thanks for your time. As discussed, payment will arrive by March 31.”

Checklist before you hit send

The invoice number, amount and original due date are correct.
You have counted the days overdue accurately.
The invoice is attached and a payment link or bank details are in the email.
The subject line includes the invoice number.
The email asks for one action by one date.
Any late fee was agreed in writing, and the math is shown.
The right people are copied.
You have a plan for the next step if there is no reply.
You have set a reminder to follow up on the new deadline.

Where PayToMe fits

The due date calculator and late fee calculator are live today and free. PayToMe is in public beta, so you can send invoices by email and track payment there. Automatic reminders that send these emails on a schedule are in development; read more about the planned smart reminders. Via (beta), the assistant, can help draft a message. For more scripts by channel, see how to ask for payment, and for fee policy wording see how to charge late fees.

Sources

This is general information, not legal advice. The statement about statutory interest on late commercial payments in the UK comes from the government’s page, Charging interest on late commercial payments, which gives 8% plus the Bank of England base rate for business-to-business transactions unless a contract sets a different rate. Late fee and collection rules differ by country and state, so check the rules where you and your client operate.

Frequently asked questions

How soon after the due date should I send a past due invoice email?

Send a first, friendly note within one to three days of the due date. Many invoices are late because of a missed email, an approval delay or a wrong address, not because the client refuses to pay. A quick reminder fixes most of those cases at almost no cost to the relationship.

Should I mention late fees in a past due invoice email?

Only if your contract or invoice terms already state them. Late fee rules vary by place, so check your local rules. If a fee was agreed, mention it neutrally from the second or third email onward, and show how you calculated it. Never invent a fee after the fact.

How many reminder emails should I send before escalating?

Most businesses use four to six touches over about 60 days: a friendly note, a firmer reminder, a call, a formal notice, and a final notice. Adjust the pace to your payment terms and the size of the invoice. A large invoice deserves a phone call sooner.

Should I send the email to the same person who received the invoice?

Start there, then add the person who approves payments. Ask who handles accounts payable, and copy them on the next message. Many delays happen because the invoice sits with someone who cannot release funds.

Is it legal to charge interest on a late business invoice?

It depends on where you and your client are. In the UK, the government says statutory interest on late commercial payments is 8% plus the Bank of England base rate, unless a contract sets another rate. In the US, rules vary by state and contract. This is general information, not legal advice.

Can I stop work if an invoice is past due?

Only if your contract allows it. A clause that lets you pause work after a set number of days overdue is common and protects you. Without one, stopping work can put you in breach. Read your agreement or ask a lawyer before you pause a project.