Hi,
Thank you for posting your query here.
If you are referring to Annual Contract, Monthly Billing Creative Cloud plans, there is no Cancellation fee associated if you Cancel within the first 14 days or during the Renewal Period ( One month from the Yearly Renewal Date). Now, if you are looking to Cancel the Subscription anytime after 14 days, than there is a Cancellation Fee associated as you have Agreed to the Terms & Conditions while purchasing the Subscription.
Since in a Monthly Plan, you pay the Outstanding invoice and then use the Subscription for the remaining days, it is recommended to Cancel the Subscription, one day prior to the Billing Date, so that if you pay on 1st day of the month, you can use the Services until 30th of the same month and request Cancellation on the same day so that Billing is not charged on 1st of next month.
Hope it helps.
Thank you.