Google Checkout is going to use a tiered fee structure that is more comparable to the payment engine: Paypal. The AdWords discounts for sellers who use the search giant's online payment processing system will be removed. Essentially this change will raise rates for most online merchants.
Rate Cost Structure:
1.) 1.9 percent plus 30 cents per transaction for monthly sales of $100,000 or more
2.) 2.9 percent plus 30 cents per transaction for monthly sales of less than $3,000
Current Google Checkout Rates:
2 percent plus 20 cents per transaction, with no monthly, setup, or payment gateway service fees