I will preface this with I am not a lawyer or an accountant, just a guy, so am I reading this wrong? Oh and this really just affects Pool Operators in the US.... for the moment anyway.
These are from the actual IRS notice..
http://www.irs.gov/pub/irs-drop/n-14-21.pdf"Q-10: Does virtual currency received by an independent contractor for performing services constitute self-employment income?
A-10: Yes. Generally, self-employment income includes all gross income derived by an individual from any trade or business carried on by the individual as other than an employee. Consequently, the fair market value of virtual currency received for services performed as an independent contractor, measured in U.S. dollars as of the date of receipt, constitutes self-employment income and is subject to the self-employment tax.
See FS-2007-18, April 2007, Business or Hobby? Answer Has Implications for Deductions, for information on determining whether an activity is a business or a hobby."
and
"Q-13: Is a person who in the course of a trade or business makes a payment using virtual currency worth $600 or more to an independent contractor for performing services required to file an information return with the IRS?
A-13: Generally, a person who in the course of a trade or business makes a payment of $600 or more in a taxable year to an independent contractor for the performance of services is required to report that payment to the IRS and to the payee on Form 1099-MISC, Miscellaneous Income. Payments of virtual currency required to be reported on Form 1099-MISC should be reported using the fair market value of the virtual currency in U.S. dollars as of the date of payment. The payment recipient may have income even if the recipient does not receive a Form 1099-MISC.
See the Instructions to Form 1099-MISC and the General Instructions for Certain Information Returns for more information. For payments to non-U.S. persons, see Publication 515, Withholding of Tax on Nonresident Aliens and Foreign Entities."
So basically if you are mining a pool, you are an independent contractor, and if an independent contractor makes more than $600 worth of convertible currency from a pool in a given year, the owner would have to send them a 1099-MISC. Plus there are additional rules for withholding to foreign entities.
This means that (at least for pools in the US) that the average pool owner would have some SERIOUS tax work to do under these new rules and they would need to start following KYC guidelines for user registration. The work involved could be mitigated by some of the popular pool software, like MPOS, adding more registration info requirements (KYC) and keeping a log of payouts in the db that can be queried when needed.
No question involved here, just an observation and maybe a call for people to give their opinions as well as get the ball rolling on possible future updates to Pool Mining platforms.