Having 4, 6, 12, or even more accounts with individual invoices, billing methods, support contracts, reserved instance pools, and everything else that comes along would be enough to drive anyone crazy. Luckily, AWS offers a great solution that is easy to set up and manage.
Considered to be best practices in AWS, as well as one of the most popular ways to fully maximize the potential of AWS, is to utilize multiple accounts. Accounts can be set up as either per-organization, per-department, or even per-application and can be utilized to logically and physically separate any resources to fit your organization’s needs. This, combined with master-account billing and properly utilizing Tags, can allow you to be as separate, yet collected, as you see fit.