Available since the early 1990's, Peachtree Accounting Software is owned by Sage Software. Several years ago, following the release of Peachtree Accounting r2012, Peachtree software was officially renamed as Sage 50.
In the Sage 50 product line, Sage currently offers Sage 50 Pro, Sage 50 Premium, and Sage 50 Quantum. Sage 50 r2016 is the current version available as of June 2015.
Peachtree r2012 is sometimes referred to as "Peachtree Classic" - not only because it was the last version which went by the Peachtree name - but this was also the last year when users who ran payroll could independently set up their own tax formulas.
What version of Peachtree / Sage 50 are you using now? If thinking of making a change, what are you considering?