"Why aren't my shipping rates or taxes showing up?"
Well, you might be a bit confused about this. Our store needs to know the customer's billing/shipping address before it calculates shipping rates. The shipping address gets added on the second page of the checkout process.
With PayPal Express we use, you are first taken to the PayPal checkout page where you input your credit card information. Once PayPal gets a billing and shipping address, they send that to our built-in checkout page in order for us to calculate which shipping method and rates are applicable. :)