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Out of curiosity, do you keep 1-1 mapping among users/groups/roles(/resources?) across different accounts? Because that's another possible source of complexity.

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We (http://gruntwork.io) are still establishing best practices around managing multiple AWS accounts, but so far having a single "admin" account where all IAM Users are managed seems like a best practice. You can then implement a nifty dropdown that allows IAM Users to easily switch accounts. [1] I'm not sure about how IAM Groups fits into this.

For IAM Roles, we use Infrastructure-as-Code (Terraform) to create all those anyway, so I still prefer to create those in the AWS account that contains the resources to which they apply.

[1] https://aws.amazon.com/blogs/security/enable-a-new-feature-i...

Just for anyone wondering, as per joshpadnick's great suggestions, you can specify other AWS account's users/roles via Principal in a policy as well. Just use the other AWS account in the ARN. edit: if you want to do so via policies that is

I'd be interested to see your team's workflow for multiple accounts @joshpadnick.

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