What Is a Billing Cycle?

An official definition, from US consumer credit rules
Parts of a billing cycle

A billing cycle is the regular period between one invoice and the next for the same customer, and the period each invoice covers. If you bill a client on the 1st of every month for that month's work or service, your billing cycle is one calendar month. Cycles can be daily, weekly, monthly, quarterly or yearly, depending on what you and your customer settle on in your contract.

Billed publishes this page. This is general information, not legal advice.

An official definition, from US consumer credit rules

The term has a formal meaning in US consumer credit. Regulation Z, the US rule that implements the Truth in Lending Act, says in 12 CFR 1026.2(a)(4): "Billing cycle or cycle means the interval between the days or dates of regular periodic statements. These intervals shall be equal and no longer than a quarter of a year."

That definition applies "For purposes of this part," which covers creditors' periodic statements, such as credit card statements. It isn't a rule for how a business sets the billing cycle on its own invoices. The text is from the eCFR, current as of October 28, 2026, read on October 29, 2026.

Parts of a billing cycle

Cycle length: the time between invoices, such as a week, a month or a year.
Service period: the dates the invoice covers. Show them on each invoice, for example June 1 to June 30.
Invoice date: the day you send the invoice, for example the 1st of each month.
Due date: when payment is due, set by your payment terms, for example 15 days after the invoice date.

Calendar billing and anniversary billing

Calendar billing: every customer's cycle starts on the same date, such as the 1st of the month. A customer who starts mid-month gets a shorter first invoice.
Anniversary billing: each customer's cycle starts on the day they signed up. A customer who started on June 11 is billed on the 11th of each month.

Whichever you use, say it in your contract or terms, and put the service period on every invoice so the customer knows what they're paying for.

Worked example: a mid-month start on calendar billing

The business and figures here are a sample, invented for this example.

A bookkeeper bills a monthly retainer of $1,200 on the 1st of each month, for that calendar month. A new client starts on June 11. The contract says a partial first month is charged by the day.

Days covered in June: June 11 to June 30 = 20 days, out of 30 days in June.
First invoice, dated June 11: 20 ÷ 30 × $1,200 = $800.
From July 1: one invoice of $1,200 on the 1st of each month, covering that month.
Total billed from June 11 to December 31: $800 + 6 × $1,200 = $800 + $7,200 = $8,000.

Charging by the day is one way to handle a partial first period. Others are a flat first-month fee or starting the cycle on the first full month. Write your method into the contract.

Choosing a cycle length

Match how you deliver the work. A monthly retainer fits a monthly cycle. A yearly plan fits a yearly cycle.
Check your customer's payables schedule. Some business clients pay suppliers on set days, so ask during client onboarding and pick an invoice date that fits.
Think about your cash flow. Longer cycles mean fewer, larger payments. See how to manage cash flow.
Plan for changes mid-cycle, such as a customer adding or removing a service, and say in your contract how they're billed.

If you sell subscriptions to consumers, rules on automatic renewal and cancellation vary by place. Check local rules and ask a lawyer before you set them up.

Sending invoices each cycle

Send each cycle's invoice on the same day, show the service period and the due date, and follow up on anything unpaid. See how to create a professional invoice and how to write invoice payment reminders.

Where Billed fits

Billed's recurring invoices page says, "With Billed recurring billing you don't have to create invoices manually every day, week, month or year. Invoices are created automatically and sent to your customers according to your settings." Under Billing Frequency, it says: "Choose whether to send invoices daily, weekly, monthly or yearly." It also says you can "Auto send invoices or save them as draft to recheck and send later."

For more on setting up repeat billing, see the recurring invoices guide.

Frequently Asked Questions

What is a billing cycle?

The regular period between one invoice and the next for the same customer, and the period each invoice covers, such as a week, a month or a year.

What is the difference between a billing cycle and payment terms?

The billing cycle sets the time between invoices and what period each invoice covers. Payment terms set when each invoice is due, for example 15 days after the invoice date.

How do I bill a customer who starts in the middle of a cycle?

Follow the method in your contract. In the sample, a client starting June 11 on a $1,200 monthly retainer is charged by the day for June: 20 of 30 days, or $800, then $1,200 on the 1st of each month.

What is anniversary billing?

A cycle that starts on the day each customer signed up, so a customer who started on June 11 is billed on the 11th of each month. Calendar billing starts every customer's cycle on the same date instead.

Can I change a customer's billing cycle?

Check what your contract says first. If you change it, tell the customer in writing before the change, and make sure no period is billed twice or left out.

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What Is a Billing Cycle? Lengths, Dates and Mid-Month Starts