Note: This action can only be taken by Account Owners or users with "Can view and manage billing settings" permission enabled. Read this article to learn how to give proper permission to other users so they can view your account's upcoming payments if needed.
Upcoming Payments can be viewed at the Usage and Billing page, you can find this page under Account Setting Section on the left navigation.
Inside the Account Details page, you will be able see all the upcoming payments displayed under Upcoming Payments section.
For each item shown, you will be able to see when the payment is going to occur, description of the payment, period the payment is responsible for (If applicable) and the amount chargeable for the payment: