AWS account closure

Hello.

When you cancel your AWS account as described in the document below, a confirmation email will be sent to the root user's email, and that's it.
I don't think there will be any charges if the AWS resources are deleted properly.
Your AWS account will be permanently closed after 90 days, so you can reopen it until then.
https://docs.aws.amazon.com/accounts/latest/reference/manage-acct-closing.html#what-to-expect-after-closure