The new landlord provision requires all taxpayers owning rental properties to issue a Form 1099 to any unincorporated service providers (e.g. plumbers, painters, accountants) they pay $600 or more to in a year, beginning with payments made in 2011. Those 1099s (typically, a 1099-Misc) would, of course, have to be sent to the Internal Revenue Service as well.
via Forbes.