Hey everyone! I'm looking for some clarity on the cost structure for using a Transit Gateway (TGW) between two VPCs. Here's a scenario: suppose I have VPC A in Account A connected to a central TGW in Account B, and VPC B is also connected to that same TGW. If I download a 10GB file from an EC2 instance in VPC B (located in a different availability zone) to an EC2 instance in VPC A, how is the cost split between the two accounts? Who pays for what? Would appreciate any insights!
3 Answers
For the Transit Gateway, the account that owns the sending VPC attachment (Account B) will be charged $0.02 per GB. So for a 10GB download, that's $0.20. Since the traffic is going across availability zones, both accounts get an additional charge of $0.01 per GB, adding $0.10 for Account A and $0.10 for Account B. So the total cost would be $0.40.
One thing to keep in mind: the availability zones for each account could actually be different, which might affect the charges. Just a little detail to consider!
Just to add some clarification: the charges work a bit differently. The Transit Gateway only charges the owner of the TGW (Account B) $0.02 per GB once for the data processing. Also, inter-AZ data transfer ($0.01/GB) is charged to the sending account (which would be in Account B). Account A doesn't get charged anything in this case! So for 10GB, the total would be $0.30 if the AZs are different, or just $0.20 if they're the same.
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