More Amazon shoppers can expect to pay sales taxes when they buy online this year. The massive internet merchant is adding 10 more states to the list of jurisdictions from which it collects sales tax, making the current total 39. View the affected states here.

A United Parcel Service delivery driver carries Amazon.com packages in Brooklyn, N.Y. Victor J. Blue | Bloomberg | Getty Images

The states in which shoppers are now subject to sales taxes on Amazon purchases are Iowa, Louisiana, Mississippi, Missouri, Nebraska, Rhode Island, South Dakota, Utah, Vermont and Wyoming. The latter will not begin collecting taxes on Amazon purchases until March 1, while the levies are now in effect in the other states. "Wyoming businesses are at a disadvantage when internet businesses fail to collect tax," Gov. Matt Mead said in a statement. "This is an important step in the right direction." States' coffers go wanting due to failures to collect levies from online purchases. The National Conference of State Legislatures estimated that states missed out on $23.3 billion in tax revenue in 2012.

State differences

The states' view on sales taxes for online and catalog purchases is tied to a 1992 Supreme Court case, Quill Corp. v. North Dakota. The court ruled that states couldn't require retailers to collect sales taxes unless they had a physical presence in the same place where the buyer is located. Major online retailers — namely, Amazon — more and more fall under that rule by building data centers, warehouses and other facilities in multiple locations.

Still on the hook

Even if your online retailer doesn't assess a sales tax because it doesn't have a brick-and-mortar location in your home state, your state may require you to pay use taxes on your purchase, according to Richard C. Auxier, a research associate at the Tax Policy Center. Use taxes, which apply to items you buy outside your state of residence, generally are assessed at the same rate as a sales tax. The burden of reporting use taxes falls to the consumer, Auxier said. "Everyone owes taxes on online purchases, be it from Amazon or a small retailer," he said. "The question we deal with is 'Who collects the tax?'"

Self report

States that assess use taxes give their residents a way to report it. California, for instance, provides a worksheet for taxpayers to calculate what they owe. New York, meanwhile, offers forms for reporting these levies when you file your income tax return. In the Empire State, you may be subject to penalties and interest on any back use taxes. In reality, states haven't been particularly stringent about collecting these use taxes — and many shoppers don't even know they owe. "Very few taxpayers report it, even when systems are in place to make use tax payments easy," said Auxier.