What is Calendar Billing?

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The billing process is an essential part of every business. A one-size-fits-all billing approach may not be feasible in the long run, because each business has different customer requirements that demand different billing approaches.

Subscription businesses typically billing their customers based on the date on which they sign up or the date their subscription gets activated. However, this standard billing process might not suit some business scenarios. Some customers who have multiple subscriptions might want a consolidated invoice generated on a single billing date, while others might request to change their billing dates based on their financial cycle. Your billing method should be flexible enough to meet these requirements, or your business may end up losing customers.This flexibility to set different billing dates, irrespective of the customer’s sign-up date, is provided by calendar billing.

This guide will explain the concept of calendar billing, how to implement it, and how it can benefit your business.

What is calendar billing?

Calendar billing is a billing model that allows the business owners to change the billing date at any point in the subscription cycle. Normally, the billing date for a subscription plan is based on the date that each customer subscribes to your product or service. If a customer wants to change their billing date, they will have to cancel their subscription and sign up again. For example, let’s suppose a customer signs up for your service and is billed on the 20th of every month. Without calendar billing, if the customer wanted to change their billing date to the 1st of each month, they would have to cancel their subscription and subscribe again on the first day of the following month.

However, with calendar billing, the subscription business owner can set up customized billing dates for each customer, irrespective of the date they signed up.

Benefits of calendar billing

  •  Customer satisfaction

Customers are the heart and soul of any business. Having a billing model that is flexible enough to match their needs gives your business an edge. With calendar billing, customers can change their billing dates to align with their needs, making them more satisfied with your services. Their satisfaction adds value to your business, a win-win situation for everyone.

  •  Reduced churn

Businesses that do not have a way to change the billing date of existing subscriptions often direct their customers to cancel their subscriptions and sign up again on their preferred billing date. This is a huge inconvenience for the customer and creates the risk that they will not sign up again, but rather end up churning out.

With calendar billing, the change of billing date and its associated operations can be carried out seamlessly, eliminating the threat of churn rate.

  • Increased revenue

With calendar billing you can set up multiple billing dates and give customers the option to their invoices in installments. You can also consolidate the invoices of multiple subscriptions and send them together on a fixed billing date. This reduces revenue leakage due to lost invoices and delayed payments. All of these options help to increase your revenue without compromising on customers’ convenience.

How is calendar billing implemented?

Typically, there are 3 steps to implement calendar billing:

I.  Fixing the billing date

Once the subscription is created, the billing date needs to be fixed for subscription renewal. There are different approaches a business can follow to fix the billing date.

  • The billing date can be set to the customer’s preferred date.

For instance, let’s suppose a customer signed up for the product on June 5, which would make their billing date the 5th of every month, but they asked to be billed on the 15th of every month instead.

  • If a customer has multiple subscriptions, the multiple billing dates can be consolidated into a single billing date by generating a single invoice containing the details of all the subscriptions.

For instance, let’s suppose that a customer signs up for four different services provided by the same company, and requests a single bill covering the details of all four subscriptions. This single bill can be generated on a specific billing date, with charges prorated for each subscription. Most businesses set the billing date for the grouped invoices to match the first subscription’s billing date.

  • The business can even set multiple billing dates if needed.

For instance, consider a business that sends bills weekly for the customers who signed up in that particular week. Calendar billing provides the option to set multiple billing dates, such as the 7th, 14th, 21st, and 28th of every month. So for the subscriptions created between the 8th and 14th of a month, the invoice will be sent on the 14th. Likewise, for those who signed up between the 15th and 21st, the bill will be generated on the 21st of that month.

Calendar billing implementation

II.  Configuring the billing schedule 

The subscription billing cycle can be adjusted with the new billing date, either immediately or after the first subscription cycle.

Immediate adjustment

When an immediate adjustment is made, the new date chosen will be used as the billing date of the subscription starting immediately, and the first billing will be prorated as needed.

For instance, let’s assume that your customer signs up for your product under a monthly plan on June 5 and requests a billing date of the 15th. The immediate adjustment will have the following effects:

  • The first billing cycle of this subscription will charge for the product used between June 5 and June 15.

  • On June 15, a bill will be generated that includes the prorated amount for these 10 days.

  • The subsequent bills will be generated on the 15th of every month.

Immediate adjustment

Delayed adjustment

A delayed adjustment sets a new billing date that is effective only after the customer’s subscription completes a full billing cycle. For instance, let’s suppose that your customer signs up for a monthly plan on April 1, and requests to change the billing date to the 10th of every month. The delayed adjustment will have the following effects:

  • The first billing cycle will run from April 1 to May 1, but no invoice will be generated.

  • The second cycle will run from May 1 to May 10.

  • An invoice will be generated on May 10 that includes charges for both the first and second cycles.

  • For subsequent cycles, the invoice will be generated on the 10th of every month.

Delayed adjustment

III.  Collecting charges

Once the billing date is set and the subscription cycle is aligned with the new billing date, either regular charges or prorated charges are applied.

Regular charges

As the name suggests, this means that the full subscription amount will be collected from the customers each month. The subscription price won’t be prorated even if a customer switches between plans in the middle of the billing cycle. This is usually how billing works for business owners who deal with physical products.

  • For instance, let’s suppose that one of your customers subscribes to plan A at $500 per month on June 3. The bill is generated immediately and the customer is charged upfront before the product is shipped. On the 3rd of every month, the customer is charged again before the product is shipped.

  • After a few billing cycles, the customer wants to downgrade his subscription to plan B, which costs $200 per month. He makes the request on August 17, in the middle of the current billing cycle. Immediately, a bill is generated for the new plan, the customer is charged $200, and the subscription to plan A is canceled.

  • There is no proration even though the switch between plans is made in the middle of the billing cycle. The customer is charged the full amount for each plan, and the two plans overlap for the month of August.

The calculation is as follows:

 Subscription date (to plan A) : June 3

Amount charged                       : $500

Billing date                                 : the 3rd of every month

Downgrade (to plan B) date    : August 17

Amount charged                       : $200

New billing date                        : the 17th of every month

Prorated charges

With proration, the charges are applied based on the number of days the service was used or offered. This model is popular among SaaS businesses where customers are more likely to change their subscription plans frequently.

For instance, let’s assume you sell your product under two pricing plans: plan A for $100/month and plan B for $300/month.

  • One of your customers has purchased your product under plan A and has a billing date of July 5. They decide to upgrade their subscription on June 15.

  • The bill amount has to be prorated for the period from June 5 to June 14, when they were still using the product under plan A (the lower-tier plan).

  • To do that, you first need to calculate the per-day amount owed by the customer for plan A. Then multiply that value by the number of days the plan was active, which is 10 days in this case.

  • That gives you the amount that should be deducted from the total amount to be paid for plan B (the higher-tier plan).

The calculation is as follows:

Billing date                                                                : the 5th of every month

Plan switch date                                                       : June 15

Number of days plan A was used                           : 10 days

Credits applied: $300 – [($300/30) * 10]              : $200

Number of days plan B was used                           : 20

Amount to be charged: [($500/30 )* 20] – $200 : $133.33

Next billing date                                                       : July 5

The customer will be charged the prorated amount of $133.33.

When is calendar billing used?

Calendar billing is most commonly used by box and SaaS businesses. Let’s take a look at how each of these businesses uses calendar billing.

Calendar billing in box businesses: set billing date based on the shipping schedule 

In a box business, a cutoff date is established to streamline operations like shipping, delivery, and billing. Customer who sign up and pay for the subscription on or before the cutoff date will receive the products immediately within the ongoing subscription cycle and for those who sign up after the cutoff date, the products will be delivered in the next billing cycle.

The date range can be defined for the delivery of product in the first subscription cycle, such that the customers who sign up within the date range will have a specific billing date. And if the customer signs up on any date that falls behind the date range defined, the product will be delivered in the next cycle though the charges shall be collected upfront.

For instance, let’s assume a business owner defined the 1st to 9th of every month as the date range and the customers who sign up within this date range will have the 10th of every month as their billing date.

That is, if a customer signs up on June 3, they will be charged immediately and the product will be delivered by July 9. The subscription will be renewed and the bill for the next cycle will be generated on July 10. Likewise, for all the subsequent cycles the bill will be generated on the 10th of every month.

Calendar billing in box businesses

          The additional scenarios are explained in the following table.

Calendar billing in box business

Calendar billing in SaaS businesses: set multiple billing dates 

The majority of SaaS businesses use calendar billing. Because these businesses typically offer their customers flexibility and pay-as-you-go options, generating invoices for all the different billing dates needed by different customers gets complicated and time-consuming.

Calendar billing helps overcome this. Customers can be divided into batches based on their signup date and billed on defined dates. This allows the business owner to better forecast and track their revenue.

Let’s look at the example of an e-learning service that provides scheduled online degree programs with classes starting on a quarterly basis. The students enrolled within each specific quarter are grouped into a batch and billed on a fixed billing date. 

Here’s the schedule of when students can register for the course:

Calendar billing in SaaS business

Based on this schedule, the students will be separated into different batches depending on their registration dates, and each batch will be billed on a fixed date that is exclusive for them. This is an example of using calendar billing to maintain multiple billing dates.

Whether you’re selling physical products or services, and whether you’re billing continuously or in batches, choosing the right billing method is one of the most important aspects of running a subscription business. An efficient billing system will have the flexibility to meet your customers’ needs as well as ease the back-office operations of your business. Calendar billing provides this flexibility by enabling you to change billing dates and still manage subscriptions without any complications.



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