Round 3 Tax Updates for GP 2010 & 10.0 are now available for download. (Round 1 released 12/22/2011 with Employee rate change to 6.2%. Round 1 was re-released 12/27/2011 to reflect the most recent update with Employee rate at 4.2%).
It's strongly recommended that you have a working backup of your software and all Service Packs, hotfixes, tax updates, and year end updates are currently installed before applying any patch file. For full install instructions and/or support, contact us.
For additional information on the 'Payroll Tax Cut Temporarily extended in 2012' and the 'Recapture' provision, see the Dynamics GP Support and Services Blog post.