Have you had a nice side income selling stuff on eBay or through PayPal? Sales you maybe conveniently forgot to declare at tax time?

Well, that party is officially over.

Thanks to our revenue-hungry, debt-strapped government, the IRS is now keeping tabs on what you've been selling on eBay, Amazon or your own company's website. If you've used PayPal or other popular payment-collection tools to sell products or services, you may see a crisp new 1099-K form from your payment provider. This change is a biggie.

Over the years, an industry sprang up around small,…