With so many people making part or all of their living through eBay, the government wants its cut. This isn't an issue of any new taxes, but an attempt to collect the income tax that is already required. Because eBay does not report information about its sellers to the government, income reporting is left up to individuals, and the temptation not to list eBay revenue as income can be a strong one—and in some cases, it's not always clear when one has to do so.

eBay isn't the only Internet business that has been feeling the heat in recent months. The government is also considering how to apply tax laws to virtual worlds and goods, and it faces some of the same problems that it does with eBay. While some sellers can make a good living out of hawking such items, few report the profits as taxable income, and Uncle Sam wants its cut.