Disable Taxes when using Google checkout

Hi, I am having a few issues with a Google checkout integration. When I enter Taxes for NY, regardless of what state they purchase from, taxes re still charged. Tax is only supposed to be charged if purchases are made from NY, otherwise no taxes should be charged. Google documentation says that Google will handle tax calculations if custom tax tables are not used in the custom cart. So does Marketpress have these tables? Is there any way to let Google handle the tax calculations? Thanks.