Sometimes you have some EBS volume occurring cost but you don't have any EC2 Instance Running.

You May Have Take Snapshot some EC2 Machine and forget later. Let's find out how to fix this.

First Copy The AMI ID.

Now Go TO AMI

Now Search The AMI By The ID and you will found the AMI Snap

Now Delete This Snap.

Click Delete

Now You Can Go Back EBS Snapshots Again and Delete the Volume.

Thanks