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When your customer upgrades mid-cycle, they’re charged the new plan’s full price, credited for the unused days of the old plan’s base price, and their billing cycle restarts on the day of the change.

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The Calculation

The credit covers the old plan’s effective base price only. If an Offer discount was active, Commet credits what the customer actually paid, not the undiscounted list price. Metered usage consumed since the period started is charged on the same invoice.

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Example: Simple Upgrade

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Example: Upgrade with Extra Seats

Extra seats are not credited on a plan change. Extra seats on the new plan are billed for the full new period in advance.
Your customer’s 8 seats are now fully covered by the Business plan’s 10 included seats, so they stop paying for extra seats. If they had more seats than the new plan includes, the excess would be billed for the full new period in advance.

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Quarterly, Semiannual, and Yearly Plans

The same calculation applies — the only difference is the cycle length.

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Example

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Why Downgrades Aren’t Prorated

Downgrades take effect at renewal. Your customer already paid for the current cycle and keeps their plan until it expires. Since there’s no mid-cycle switch, there’s nothing to prorate and no refund.

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Why Free → Paid Isn’t Prorated

When your customer moves from a free plan to a paid plan, there’s no credit to give — the free plan costs $0. They simply pay the full price of the new plan from that day.