> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.carbone.io/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Upgrade a Carbone Cloud subscription

# Upgrade a Carbone Cloud subscription

Upgrading a subscription result in:
* The new subscription starts a new billing period with a discount of the actual subscription unused time. The unused time is calculated as soon as the subscription change occurs.
* Each extra Documents of the actual subscription are charged and reset for the new billing period. 
* The test and production API keys remain the same

For upgrading, visit the [Plans page on your Carbone account](https://account.carbone.io/plans) and select a plan. It is not possible to change a monthly subscription into a yearly billing period and vice-versa, you must cancel your actual subscription and choose a new plan.

**Upgrade Example**

If a customer upgrades from a `Light plan` subscription at €65.00 per month to a `Medium plan` at €96.00 with 2000 extra documents and 20 extra templates, the new subscription is charged with a discount based on the unused time on the actual subscription. Assuming the change occurred halfway through the billing period, the customer is billed:
* €96.00 for the `Medium plan` subscription.
* -€32.50 for unused time on the initial `Light plan` subscription.
* €4.00 for extra documents (2000 x €0.002).
* €0.00 for extra templates
Total (before tax):
* €67.50

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