Thanks for your question.
We have a tax zone that currently includes two states Georgia (GA) and Minnesota (MN). This tax zone is named TAXGAMN and it's activated for all shipping module.
It works just fine using any of the payment module that are standard in Zen Cart. If a customer is from MN they get charged 6.5% tax and if a customer is from GA they get charged 7%.
Unfortunately, when google checkout is activated, neither GA or MN customer get charged taxes. My assumption is Google Checkout is not smart enough to handle multiple state tax zone. I haven't trying with having just one state in the tax zone, perhaps google checkout will calculate tax then. Who knows?
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