Attached Link: http://www.turbotax.com/articles/FAQonSalesandUseTaxesandtheInternet.html

MachineClaw is talking about sales tax, not income tax. btw Texas does have a "use tax" What Are Use Taxes? Most people are familiar with sales tax, but have never heard of a use tax. It is a tax on consuming, storing, or using a product for which no sales tax has been paid, and generally the consumer not the vendor must send the tax to the state. The process for figuring the use tax is just like figuring the sales tax, but, most consumers have no idea how to do the calculation, and very few even know that any such tax is due. States generally impose a use tax to collect taxes from their citizens who buy items from an out-of-state vendor who is not required to collect sales tax for that state. The tax insures that the state gets its money from all purchases by its citizens, whether they buy locally (in which case they must pay the sales tax) or from out-of-state sellers (in which case the citizen often owes the use tax). The use tax has been sitting on the law books of most states for decades but until recently, they didnt make a serious attempt to track or collect it. Now with the rise of sales-tax exempt catalog, TV, and Internet sales, many states are starting to enforce the use tax. Some have even added a line to their income tax return, just for the use tax.

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