---
title: "Late Payment Fee and Interest Calculator for Invoices | MCC"
description: "Work out the interest and flat fee on a late invoice from the amount, days late and monthly rate. Free and private, runs in your browser."
url: "https://mcc-solutionsnj.com/bookkeeping/late-payment-fee-calculator"
---

Free tool

# Late payment fee calculator

## Overview

Enter the invoice amount, how many days late it is and your monthly rate. See the interest, a flat fee if you add one, and the total now due.

[![Intuit ProAdvisor Gold tier badge](/img/credentials/intuit-proadvisor-gold.png)](https://proadvisor.intuit.com/app/accountant/search?searchId=matthew-coleman77)Gold tier in Intuit's ProAdvisor program. [See my Intuit listing](https://proadvisor.intuit.com/app/accountant/search?searchId=matthew-coleman77)

Keeping your own books? Tallyfinch does invoices, bank import and reports on your computer. [See Tallyfinch](/bookkeeping/mcc-books-downloadable-bookkeeping-software)

Invoice amount ($)

Days late

Late interest per month (%)

Flat late fee ($) (optional)

Word templates · $19

### Small Business Letter and Notice Templates

Fill in the brackets and send: the invoices, reminders and letters small businesses, landlords, associations and nonprofits write over and over.

[See what is inside ($19)](/toolkits/small-business-letter-templates)14-day full refund

Share

## Put this tool on your own site

Free to use. Paste this where you want it to appear. It runs in the visitor's browser, so nothing they enter is sent to us.

[See every calculator you can embed](/embed)

How it works

## How it works

Interest is **amount x monthly rate x (days late / 30)**. Any flat fee is added once. The result is simple interest, not compounded.

Want a second pair of eyes on your books? [A free bookkeeping health check](/bookkeeping/health-check).

Whether you can charge a late fee, and how much, depends on your agreement and the law that applies. State the terms before the work and on every invoice. Ask an attorney if you are unsure.

FAQ

## About this calculator

**How is the late charge calculated?**

Interest is the invoice amount times the monthly rate, prorated for the days late on a 30-day month. A flat fee, if you enter one, is added once.

**Can I charge a late fee?**

That depends on your contract, your invoice terms and the law that applies. State your terms before the work and on every invoice, and ask an attorney if you are unsure.

**What rate do people use?**

There is no universal rate. A common approach is a modest monthly percentage stated in the agreement. Check any limits that apply to you.

**Does a late fee get invoices paid?**

Clear terms, prompt invoicing and a polite follow-up before and after the due date usually matter more than the fee itself.

**Is anything saved?**

No. The math runs in your browser and nothing you enter is sent to us.

Make invoices clear with the [free invoice generator](/bookkeeping/free-invoice-generator), see how long customers take with [days sales outstanding](/bookkeeping/days-sales-outstanding-calculator), or read about [reading an aging report](/bookkeeping/guides/how-to-read-an-accounts-receivable-aging-report). More free tools: [Inventory turnover calculator](/bookkeeping/inventory-turnover-calculator), [Sales commission calculator](/bookkeeping/sales-commission-calculator), [Depreciation calculator](/bookkeeping/depreciation-calculator), or [see all free tools](/free-tools).

Free

### Month-End Close Checklist (PDF)

The five-day close, one page to print. Enter your email and we send a link to confirm it is yours, then the download. We may email you about new toolkits, and every email has an unsubscribe link.

General information, not tax or legal advice. [How we write and check our tools](/editorial-standards).

Word templates

### Small Business Letter and Notice Templates

Fill in the brackets and send: the invoices, reminders and letters small businesses, landlords, associations and nonprofits write over and over.

[See what is inside ($19)](/toolkits/small-business-letter-templates)

Also in the [Driver and Side Hustle Bundle](/toolkits/driver-side-hustle-bundle): 3 products for $49 instead of $62 separately.

Tallyfinch

### Books you keep on your own computer

Tallyfinch does invoices, bills, bank import, reconciliation and the main reports, in a file you own. $99 once, then $5 a month for updates; the app keeps working if you stop the plan. It does not do payroll or sales tax filing. The free download records up to 60 entries.

[See Tallyfinch](/bookkeeping/mcc-books-downloadable-bookkeeping-software) [Download it free](/tools/pro/trial/mccBooks) [Compare the three apps](/software)

## Tired of chasing payments?

[See bookkeeping](/bookkeeping/)[Call (908) 444-6373](tel:+19084446373)