Proration is adjusting a charge to cover only the portion of a billing period a customer actually used. When a plan starts, changes, or ends mid-cycle, the bill is split proportionally to the time or quantity.
Proration keeps billing fair when a plan does not line up neatly with a full billing period. If a customer upgrades on the 15th, cancels on the 10th, or starts mid-month, proration splits the charge so they pay only for the portion they used, rather than a full period.
How Proration works
Proration calculates the fraction of the period a charge applies to and bills that fraction. The usual basis is time: a $30 monthly plan started halfway through the month is prorated to about $15. On an upgrade, the system credits the unused portion of the old plan and charges the prorated cost of the new one for the remaining days.
Some systems prorate by quantity instead of time, for example adding seats mid-cycle. The output is either a prorated charge on the next invoice or, for downgrades and cancellations, a prorated credit or refund.
Proration examples
A customer on a $100 monthly plan upgrades to $200 on day 15 of a 30-day cycle. Proration credits the ~$50 of unused old plan and charges ~$100 for the remaining half-month on the new plan, so the invoice reflects ~$50 net for the change.
A customer cancels a $60 annual-billed plan after 4 months and is owed a prorated refund of roughly two-thirds, depending on the refund policy. Adding 2 seats to a 10-seat plan mid-cycle prorates the 2 seats for the remaining days.
Proration vs Full-period charge
| Prorated charge | Full-period charge | |
|---|---|---|
| Basis | Fraction of period used | Whole period regardless |
| Mid-cycle change | Split fairly | Over- or under-charges |
| Complexity | Higher (credits, math) | Simple |
| Customer perception | Fair | Can feel punitive |
Benefits & when to use it
Proration is what makes mid-cycle plan changes feel fair, which removes friction from upgrades and reduces disputes on cancellations. Any subscription product that allows changes during a cycle needs it, and most billing systems handle it automatically.
It is less relevant for pure usage-based billing, where the customer already pays only for what they use, so there is no full-period fee to split. Proration is fundamentally a subscription concept.
FAQ
What is a prorated charge?
A charge adjusted to cover only the portion of a billing period a customer actually used, rather than the full period. It applies when a plan starts, changes, or ends mid-cycle.
How does proration work on an upgrade?
The system credits the unused portion of the current plan and charges the prorated cost of the new plan for the remaining days in the cycle, so the customer pays the difference for the time left rather than a full new-plan period.
Is a prorated refund the same as proration?
A prorated refund is proration applied to a cancellation or downgrade: the customer is refunded or credited for the unused portion of a period they already paid for. It is the credit side of the same calculation.
How Credyt handles Proration
Proration is mainly a subscription concern, and Credyt prorates subscription changes the usual way. For the usage side, the question largely disappears: because usage is debited from a wallet in real time as it happens, customers already pay only for what they consume, with no full period to split. Subscription plus usage changes are reflected in both the recurring charge and the wallet grant. Explore Credyt →