When you upgrade a subscription, for example from Professional to Business, you will pay a prorated difference.
- You subscribed for an application Professional Plan at $365/year, active from 16 Nov 2020 – 15 Nov 2021. Fully paid.
- On 16 Jun 2021, you want to upgrade to Business Plan which costs $730/year.
=> The prorated charge for Business Plan (which costs $730/year) from 16 Jun 2021 to 15 Nov 2021 (6 months) is: $365
When you downgrade a subscription, you will not be refunded for the difference.