The Senate planned to vote Monday on a bill that would give states the power to charge sales tax for online purchases.
Right now, a state can only collect sales taxes if the online company has a brick and mortar store within that state.
If passed, the new law would require online outlets with sales of at least $1 million to collect taxes for the states where they ship the goods.
The bill has support from retail giants like Amazon and Walmart.
Opponents insist the law would actually create new taxes and put an unfair burden on businesses.
The National Retail Federation believes it's just a matter of the law catching up with the growth of ecommerce.
The measure is expected to pass the Senate, but it faces opposition in the House.
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