Alabama Department of Revenue spokeswoman Carla Snellgrove said the state has started a pilot program that sends letters to a random sample of taxpayers who did not report any use taxes on their annual filings.
Alabama residents are required to pay a 4 percent tax when a retailer doesn't collect the state sales tax.
That tax could apply to computers, books, electronics and clothing purchased online or from an out-of-state store.
In a typical year, less than 1 percent of the 1.8 million people filing an Alabama tax return report owing any use tax.
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