Recurring invoices explained

What is a recurring invoice?

It is an ordinary invoice that repeats. The client, the description and often the amount stay the same, while the invoice number, the dates and the billing period change each time. The repeat comes from your agreement with the client, not from a special invoice type.

Three things make repeat billing work smoothly:

• A written agreement. What is included, the price, how often you bill and how either side can stop.
• A fixed rhythm. Bill on the same day of each period so the client knows when to expect it.
• A clear period on every invoice. “Services for November 2026” removes any doubt about which month a payment covers.

The basics of a single bill are in our guide on how to write an invoice. This page covers what changes when you bill on repeat.

Retainers, subscriptions and payment plans

Most repeat billing falls into one of four patterns. They differ in whether the amount changes and whether you bill before or after the work. Knowing which one you have tells you what each invoice needs to show.

A retainer often has an overage rule. If the bookkeeper above works 15 hours, the three extra hours go on that month’s invoice as a separate line, at the rate agreed in advance. Freelancers on retainers will find more on this in invoicing as a freelancer.

How to number invoices that repeat

Give every invoice in the series a new number from your normal sequence. Never reuse last month’s number or add a letter to it. Each invoice is a separate record for tax and for the client’s accounts, so it needs its own unique number, even when the content is identical.

Ways to keep the series easy to follow:

• Keep one running sequence for all clients, such as INV-0231, INV-0232, INV-0233.
• Or add a year, such as 2026-0231, if you like to see the year at a glance.
• Put the agreement or contract reference in the description, for example “Retainer RA-07, December 2026”, rather than in the number.
• If you skip or void a number, keep a note of why.

Our invoice numbering guide explains the reasons behind these rules, and the invoice number generator helps you set up a format you can keep for years.

Keeping issue dates, periods and due dates straight

Each repeat bill has three dates: the day you issue it, the period it covers and the day payment is due. Keep the gap between them the same every time. A steady pattern, such as issuing on the 1st with payment due on the 15th, makes late payments easy to spot.

Here is a sample calendar for a $950 monthly retainer billed in advance, due 14 days after issue:

The numbers jump because other clients are billed in between, which is fine. Avoid billing on the 29th, 30th or 31st, since some months do not have those days. If a client starts midmonth, bill a part month once (for example 16 of 30 days, $506.67) and then move to the regular date. Our guide to setting an invoice due date covers terms like net 14.

Doing repeat billing with a free invoice generator

A free generator can handle repeat billing if you have a few clients and a monthly routine. Our invoice generator does not send invoices on a schedule, so you make each one yourself. It keeps your last 20 invoices in this browser, which helps when you rebuild next month’s bill.

A five minute monthly routine:

1. Set a calendar reminder for the same day each period.
2. Open a new invoice and enter the client, the same description and the new period.
3. Use the next number in your sequence and the new issue and due dates.
4. Add any extras, such as overage hours, as separate lines.
5. Download the PDF, send it and log it in your list of sent invoices.

Drafts are saved in the browser you used, so do the routine on the same device. If you clear your browser data, the saved invoices go too, so keep the PDFs.

When an invoicing app is worth it

Move to an app when the routine starts to slip: you forget a month, send the wrong period or spend time chasing payments. Software can create each invoice on a schedule, send it and remind the client when it is overdue. That removes the steps most likely to go wrong by hand.

Our sister product WhizInvoice does this. Its site lists recurring invoices on the Starter plan, while the free plan includes unlimited invoices and customers and automatic payment reminders (checked October 2026). It suits you if you bill several clients on repeat and want reminders to go out without you.

For a wider look at the options, see our comparison of free invoicing software, or read about choosing an invoice app for a small business.

Changing the price, pausing or ending the arrangement

Give written notice before you change a recurring price, and say which invoice the new amount starts on. Pauses and cancellations should also be in writing, with the last billed period stated. If you billed for a period you then did not provide, issue a credit note rather than editing the old invoice.

• Price change: “From the invoice dated March 1, 2027, the retainer will be $1,020 a month.”
• Pause: “No invoices for April and May 2027; billing resumes June 1, 2027.”
• Ending: “Final invoice INV-0322 covers June 2027.”

Our page on credit notes shows how to reverse a bill you sent in error.