The Supreme Court declined to hear an appeal from Amazon and Overstock that would've potentially kept New Yorkers from paying state sales tax on online purchases.
The online retail giants had been challenging the legality of a state law mandating they collect state sales tax on purchases made through their web portals.
New York passed a law in 2008 requiring such retailers collect sales tax if they maintain so-called affiliates inside the state.
An affiliate could be a blog or site offering coupons and deals for a commission.
The court's decision not to hear the appeal could prompt more states to attempt to collect taxes from website purchases.
So far, around 20 states already have such laws on the books.