Here’s a good bet: Millions of fans of online sports gambling have no idea they’re racking up big tax bills on their wagers—at least as the Internal Revenue Service sees it. Sports betting has exploded since 2018, when the Supreme Court struck down a national ban, and it’s now legal in 37 states and the District of Columbia.

Consulting, freelancing, starting a side business, there’s a lot of talk about flashy terms like these nowadays. This week’s article from Forbes Advisor gets a little more into the weeds, offering a detailed look into the sole proprietorship, one of the simplest business entities you can form. It goes over the definition, tax benefits, and risks of a Sole Proprietor. No matter what type of business you are involved in, always know the taxes involved.