---
title: "Promise to pay agreement template for business invoices"
description: "Free promise to pay agreement and letter template for an overdue business invoice: what to include, whether it is enforceable, and when you need one."
url: https://www.paidnice.com/blog/promise-to-pay-agreement-template
---

# Promise to pay agreement template for business invoices

By Denym BirdCo-founder & CEO of Paidnice
7 min read · Updated Oct 11, 2026

## Summary

A promise to pay agreement for a business invoice is a short note in which the customer confirms the invoice, the amount and one payment date. It is not a loan document. Most promises need only a dated email reply, and a signed copy is worth having on larger invoices.

- **What goes in:** Name both parties, the invoice and balance, one payment date, how the customer will pay, what happens to the late fee, and what happens if the date is missed.
- **Enforceability:** In California and New York, a promise to pay extends the time limit to sue only if it is in a writing the customer signed.
- **Customer self-service:** A customer can promise a date from the invoice page in the Paidnice portal, and your reminder policies can wait for that date.

Contents▾

You get a reply from your customer's accounts payable contact: "We will pay it on the 15th." Your next reminder is due tomorrow, and the reply names no invoice and no amount. US small businesses waited [29.3 days on average](https://www.xero.com/resources/small-business-insights/latest-united-states/) to be paid in the June 2026 quarter. Here is what a promise to pay should say, and what to do before and after the date.

## What is a promise to pay agreement for a business invoice?

**A promise to pay agreement is a short written note in which a business customer confirms one overdue invoice and promises to pay it in full on one named date.**

This page is for business-to-business invoices, not loans or personal debts. The customer already owes the money under the invoice terms they accepted. A [promise to pay](https://www.paidnice.com/dictionary/promise-to-pay) records what is owed and when it will arrive, and it changes the original terms only where the note says so.

## How is a promise to pay different from a payment plan, an IOU or a promissory note?

**A promise to pay covers one payment on one date. A payment plan splits the balance into dated installments, an IOU only admits a debt, and a promissory note is a lender's document that normally carries interest and default terms.**

- A promise to pay covers one invoice, one date and the full balance. It suits a customer who can pay but has not yet.
- A payment plan sets two or more dated installments against the same balance. Use a [payment plan agreement](https://www.paidnice.com/blog/payment-plan-agreement-template) when the customer cannot pay in one go.
- An IOU admits that money is owed, with no date and no terms.
- A promissory note is a loan instrument between a lender and a borrower, usually with interest, repayment terms and default clauses. It is built for lending, and an overdue invoice does not need it.

## Is a promise to pay enforceable?

**A written promise to pay extends the time limit to sue in [California](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP&sectionNum=360) and [New York](https://www.nysenate.gov/legislation/laws/GOB/17-101) only if the customer signed it, so get a signature on larger invoices.**

California's Code of Civil Procedure puts it as an acknowledgment "contained in some writing, signed by the party to be charged". New York's General Obligations Law takes the same position. Other states have their own rules, and the time limit itself varies by state and contract type, so get a signature where the amount justifies the effort.

A dated email or a portal promise is still useful evidence: it shows the invoice the customer acknowledged, the amount, and the date they chose.

This is general information, not legal advice. Consumer debts follow different rules: the Fair Debt Collection Practices Act covers ["consumer debts incurred for personal, family, or household purposes"](https://www.ftc.gov/legal-library/browse/statutes/fair-debt-collection-practices-act), so use this template for business customers only.

## What should a promise to pay agreement include?

**A promise to pay agreement should name both parties, the invoice number and balance, the single payment date, how the customer will pay, what happens to late fees, and what happens if the date is missed.**

- Both parties: your business and the customer's business, with addresses.
- The invoice number, invoice date and original amount.
- The balance promised, net of any part payment already made.
- One payment date, written in full. "End of the month" is not a date.
- The payment method: card, ACH or bank transfer, with the link or bank details.
- What happens to the late fee: waived if paid by the date, or unchanged. Say which.
- What happens if the date is missed: reminders and any fees resume from the missed date.

One invoice, one date. A customer who asks for several dates is asking for a payment plan, covered [below](#when-plan).

## Where can I get a free promise to pay letter and agreement template?

**The two templates below are free to copy: a letter that asks a customer for a payment date, and a one-page agreement that records it. Use the letter first and the agreement second.**

If the first reminder had no reply, start with the [payment reminder email templates](https://www.paidnice.com/blog/email-templates-for-invoice-payment-reminders).

Promise to pay letter
Subject: Invoice [INV-0000] for [$0,000.00]: please confirm a payment date

Hi [Name],

Invoice [INV-0000] for [$0,000.00] was due on [due date] and is now [number] days overdue.

Could you reply with the date you will pay it in full, and how you will pay? You can pay online here: [payment link].

Once I have your date, we will hold further reminders on this invoice until then.

Thank you,
[Your name]
[Your business]

Promise to pay agreement
PROMISE TO PAY

Between [Your business name and address] ("we") and [Customer business name and address] ("the customer").

Invoice: [INV-0000], dated [invoice date], original amount [$0,000.00].
Balance owing: [$0,000.00].

1. Promise. The customer promises to pay the balance owing in one payment on or before [payment date].

2. How. The customer will pay by [card / ACH / bank transfer] using [payment link or bank details].

3. Reminders. We will pause reminders on this invoice until [payment date].

4. Late fee. [Choose one: If the balance is paid in full by [payment date], we will waive the late fee of [$00.00]. / The late fee of [$00.00] stays on the invoice.]

5. If the date is missed. The invoice stays due. Reminders and any late fees or interest under the original invoice terms continue from the missed date, and we may take further steps to collect.

6. Everything else. All other terms of the invoice and of [contract or PO number] stay the same.

Signed for the customer: [name, title]
Date: [date]

Signed for us: [name, title]
Date: [date]

Replace every bracket. Keep the signed copy, or the customer's email, with the invoice.

## Do you need a signed agreement or is an email enough?

**For most invoices a dated email or portal reply naming the invoice and the date is enough. A signed agreement is for larger invoices, repeat late payers, or when you waive a late fee in return for the date.**

A customer who writes "we will pay INV-1042 on October 24 by ACH" has given you everything the agreement asks for. Confirm the date back the same day, as in [what to do when a customer replies to a payment reminder](https://www.paidnice.com/blog/customer-reply-payment-reminder). Save the signed version for three cases:

- The balance is large enough that you would consider legal action if unpaid.
- The customer has already missed one promised date, on this or another invoice.
- You are waiving a fee in return for the date and want the condition recorded.

If the customer is querying the invoice rather than promising a date, [resolve the dispute](https://www.paidnice.com/blog/handle-disputed-invoice) first.

💡 Paidnice insight

In Paidnice the customer can make the promise with no letter at all. The invoice page in the [customer payment portal](https://www.paidnice.com/customer-payment-portal) lists "Promise to pay" under its other options, so a customer who opens a reminder can pick a date on the spot. The promise sits on the invoice as a dated record and sets the expected payment date.

## What happens to reminders and late fees while you wait for the promised date?

**Pause the reminders until the promised date, keep the late fee available as leverage, and restart the schedule after the date if the invoice is still unpaid.**

A customer who has given you a date does not need three more reminders before it. Sending them anyway tells them nobody read their reply. Hold the schedule until the promised date, then let it run again if the money has not arrived.

[Late fees](https://www.paidnice.com/late-fees) are leverage: apply them automatically, waive them deliberately. A waiver written into the agreement, "waived if paid in full by the date", gives the customer a reason to keep the date. If you [waive the fee](https://www.paidnice.com/blog/waiving-late-payment-fees), tie the waiver to the date in writing rather than agreeing a blanket write-off on the phone.

💡 Paidnice insight

Reminder and late fee policies in Paidnice each carry a "Skip when payment promised" toggle. With it on, the policy waits until the promised date instead of firing on schedule. A grace period passes before the promise is marked broken, and the invoice owner can get a Broken Payment Promise email when it is.

## When is a payment plan better than a promise to pay?

**Use a payment plan when the customer cannot pay the balance on one date and needs two or more dated installments.**

A plan fits when the customer has a real cash problem rather than a timing gap. [Payment plans](https://www.paidnice.com/create-payment-plans) split the balance into installments the customer agrees to up front, and the [payment plan agreement template](https://www.paidnice.com/blog/payment-plan-agreement-template) is the one the customer signs.

## What do you do when the promised date passes?

**When the date passes unpaid, contact the customer the next business day, record the missed date, and move the invoice to the next step in your escalation process instead of accepting a second open-ended promise.**

After the first miss, work out whether you are [looking at a delay or a cash problem](https://www.paidnice.com/blog/customer-not-paying-invoice), because that decides the next step. A second promise is fine if it comes with a shorter date and a reason.

[What to do when a customer promised to pay and did not](https://www.paidnice.com/blog/broken-promise-to-pay) has the full follow-up script. Your [escalation steps](https://www.paidnice.com/escalations) should say what follows a second miss: a call, a [letter of demand](https://www.paidnice.com/blog/letter-of-demand-template), or a hold on new work.

## Promise to pay agreement questions

How does a promise to pay work?

The customer confirms the invoice, the amount and one payment date in writing. You hold reminders until that date, then let them run again if the invoice is unpaid.

Can an email be a promise to pay?

Yes, for practical purposes. A dated reply that names the invoice, the amount and the payment date records the commitment and gives you a date to hold reminders to. Ask for a signature on larger invoices or where you are waiving a fee.

Can I draft my own promise to pay agreement?

Yes. Replace the brackets in the agreement above, choose the late fee line that matches your terms, and keep the signed copy with the invoice. Have a lawyer review anything large or anything that changes the original contract terms.

Written by

#### Denym Bird

Co-founder & CEO of Paidnice

Denym is a software entrepreneur and writes about accounts receivables management for small business.

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