# Proration

> A billing adjustment that credits unused time and charges only the remaining difference when a subscription changes mid-cycle, so the customer never pays twice for the same time.

**Proration** is the billing adjustment subscription services apply when a plan changes in the middle of a billing period. The provider calculates the unused time on the current plan, issues that amount as a credit, and charges for the new plan. The customer pays only once for any given period.

## How AnyTrack handles proration

AnyTrack prorates every plan change, in both directions, and never refunds a plan-change payment:

- **Upgrade** — the change takes effect immediately. The payment is prorated to reflect the new plan, and the invoice lists each proration line.
- **Downgrade** — there is no refund for the unused time on the current plan. Stripe credits the unused time toward the price of the new plan.

A prorated credit is not a refund: no money returns to the payment method. See [Upgrade or Downgrade Your Plan](/docs/plan-changes) and the [Refund Policy](/docs/refund-policy).