It's hard out there for the world's largest online retailer. Amazon.com caught grief from much of the literary world yesterday after announcing its acquisition of social-reading site Goodreads. Now, they've been told by the New York Court of Appeals that there will be "No tax breaks for you!"

Yesterday the court ruled in a 4-1 decision combining suits mounted by Amazon and Overstock.com that the retailer must charge the nearly 10% sales tax in New York State. The companies' suits challenged a 2008 law requiring they charge sales tax due to their in-state affiliates who sell through Amazon, even though the company does not have a New York presence. Eight other states have enacted similar laws.

This decision is the latest in an ongoing battle for Amazon to win the hearts, minds and credit card numbers of every American by reducing their prices to as close to zero as possible: Amazon also sued five years ago over the same tax, a suit they lost soon after (We're starting to notice a pattern…).

Still, Amazon is reluctant to accept defeat. "The ruling by the New York Court of Appeals conflicts with both the U.S. Supreme Court's precedents and with contrary decisions by other state courts that have looked at the same issue," an Amazon spokesman told Reuters. The Times reports that Overstock may challenge the decision in Supreme Court. But we imagine it will be a while before our highest court gets to the Internet tax, as they've got a fairly high-profile case on their hands at the moment.