Google Drive storage plans are non-refundable, but you can cancel your plan so that it doesn't automatically renew. To cancel or downgrade:
Downgrade your plan
- Go to google.com/settings/storage.
- Click the rate on the plan you want.
- Click Subscribe.
- You'll get a confirmation email. On the start of the next month of your plan, your plan will be canceled or downgraded.
Cancel your plan
- Go to google.com/settings/storage.
- Under your current plan, click Cancel plan.
Canceled plans are non-refundable and can't be transferred from one Google Account to another.