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Subscription proration

Explain the mid-period adjustment

Show what changes on the bill when a subscriber moves plans. Review the unused-time credit, the remaining-plan charge and the next renewal together.

Discuss plan adjustmentsFollow the calculation

SUB-318 · Change on 16 Sep

Studio → Studio Plus

USD 100/month → USD 160/month

Adjustment for this period
USD 30
16 Sep–1 Oct 2026
Next full renewal
USD 160
1 Oct 2026

Review both amounts before applying the change.

One remaining period, two lines

Your subscriber moves from Studio to Studio Plus on 16 September, exactly halfway through the billing period. The unused half of Studio offsets the remaining half of Studio Plus.

1 Sep → 16 Sep

First half used

16 Sep → 1 Oct

Half remains

All dates are in 2026 at 00:00 UTC. One subscription, with no tax, discount, usage or add-on adjustments.

Unused StudioUSD 100 × ½ remaining
−USD 50
Remaining Studio PlusUSD 160 × ½ remaining
+USD 80
Net adjustment
USD 30
Is every month calculated as 30 days?

No. The calculation uses the actual time remaining in the actual billing period. This September example has exactly half left. Each credit and charge is rounded separately to the currency’s smallest unit before the total is calculated.

Read the credit inside the adjustment

The USD 50 credit offsets the USD 80 remaining-plan charge. It is an invoice line in the USD 30 calculation, not a separate cash refund.

If a change would produce a negative immediate invoice total, this change flow rejects it. Choose the next-renewal option instead and review the new full-period price.

What if this upgrade starts at the next renewal?

For Studio to Studio Plus on 1 October, the preview has no immediate adjustment and shows USD 160 for the next renewal. Review and apply that scheduled change separately.

After reviewing the preview

Keep the next bill in view

Immediate upgrade adjustment
USD 30 for the remaining period
1 October renewal
USD 160 for Studio Plus

Applying a change and collecting payment are separate steps. Follow the invoice and payment result before marking the adjustment paid.

More in Subscriptions

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Recurring billing

Keep each billing period, invoice and collection result connected.

Subscription pricing

Choose the target price and effective timing before applying a plan change.

Subscription Lifecycle

Review subscription changes and their effective dates.

Frequently Asked Questions

What should we review besides the plan amounts?+
Check the current period, effective time, quantity and target price, plus any add-ons or discounts. The worked calculation here uses one subscription with no additional adjustments; use the full preview for your subscriber.
Can this plan change use a different currency?+
No. This subscription-change path requires the target price to match the current currency. Confirm any different currency setup separately.
Does the preview charge the subscriber?+
No. Previewing shows the immediate adjustment and next renewal. Applying the change is a separate action, and the invoice and payment result tell you whether collection succeeded.

Make plan adjustments easier to explain

Tell us how subscribers change plans and which billing questions reach your team. We’ll work through the preview, timing and payment follow-up together.

Discuss plan adjustments