How Does Overage Billing Work?

Depending on your plan type, you may sometimes see additional charges on your monthly Prefinery bill. Each plan comes with an included quantity of Users. If your total User count ever exceeds the limit of your plan, we won’t interrupt your service. Instead, you’ll see an additional charge on your monthly bill.

In this article, you’ll learn about additional charges.

Charges by plan type

Overage charges are billed per User per month, based on the following tiers:

Users Count Lite Plan (USD) Essentials Plan (USD) Pro Plan (USD)
For the first 1,001 - 2,000 $0.0100 Included Included
For the next 2,001 - 5,000 $0.0095 Included Included
For the next 5,001 - 10,000 $0.0085 $0.0090 Included
For the next 10,001 - 25,000 $0.0075 $0.0080 $0.0085
For the next 25,001 - 50,000 $0.0065 $0.0070 $0.0075
For the next 50,001 - 100,000 $0.0055 $0.0060 $0.0065
For the next 100,001 - 200,000 $0.0045 $0.0050 $0.0055
For the next 200,001 - 500,000 $0.0035 $0.0040 $0.0045
For the next 500,001 - 1,000,000 $0.0030 $0.0035 $0.0040
For the rest, over 1,000,000 $0.0025 $0.0030 $0.0035

An example calculation of monthly overage charges for an account with 108,000 Users with the Essentials Plan:

(5000 x .009) + (15000 x .008) + (25000 x .007) + (50000 x .006) + (8000 x .005) = $680

For customers still on our legacy Business plan, the following tiered overage charges apply:

Users Count Business Plan (USD)
For the first 1 - 25,000 Included
For the next 25,001 - 50,000 $0.006
For the next 50,001 - 100,000 $0.0055
For the next 100,001 - 200,000 $0.005
For the rest, over 200,000 $0.004

About peak user amount

We calculate your monthly bill based on your plan, as well as the peak User amount during the billing period. This means that even if your User count decreases, your bill will reflect the highest number of Users stored at any point in your account that month.

About billing in arrears

The way overage usage is billed is different from the subscription plan. The monthly subscription charge is billed ahead of time (at the beginning of the billing cycle) for future usage. However, the overage charge is billed looking backwards (at the end of the billing cycle) for usage in the past. This is often called billing in arrears. Given this, you may be billed for overage which occurred in the past, even after you have cancelled your subscription.

For example: 

  • You subscribed to the Pro plan on Jan 1 (covering the period Jan 1 - Feb 1) and only got charged for that plan's monthly price. 
  • Some time between Jan 1 - Feb 1 you've gotten to 40k users already, which means an overage of 30k users. Even if you delete 5k users, your maximum overage in this period remains at 30k. 
  • On Feb 1, you got billed again for the Pro plan subscription renewal (to cover the incoming period Feb 1 - Mar 1) AND this time also for the 30k users overage from the previous billing period (Jan 1 - Feb 1). 
  • Between Feb 1 - Mar 1, you've reached 60k users, which means an overage of 50k users, but your campaign has also ended and you decided to cancel your Pro plan subscription effective immediately. This means you will no longer be renewed for the plan starting Mar 1, BUT on that date you will still be billed, for the last time, for the 50k users overage from the prior billing period (Feb 1 - Mar 1). 

This way, you are only billed for the highest overage count when they have occurred within a billing cycle, and not in advance. 

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