Rearranging the letters of 'preparing taxes' (Taxes) gives:
I grasp an expert.
(by Rodney Koodray Jr) (2007) (pending approval)
Other related anagrams without their own page:
"Income taxes" -> "To exciseman." (by Wayne Baisley) (2004)
"Income taxes" -> "Examine cost." (by Rick Rothstein using Anagram Genius) (2003)
"Income taxes" -> "Some? Inexact." (by Rick Rothstein using Anagram Genius) (2003)
"Income taxes" -> "Excite moans." (by Jason Lofts by hand) (2013) (pending approval)
"Income taxes" -> "Toxic enemas." (by Adrian Storisteanu using Anagram Genius) (2010) (pending approval)
"Clintons release seven years of income tax returns" -> "Earners use an extra millions (confess to every cent)" (by Aronas Pinchas) (2008) (pending approval)
"graduated federal income tax" -> "Daft retard; deluxe egomaniac." (by Nicole Welk using Anagram Genius) (2005)
"Federal Income Tax" -> "I'm an extra, cold fee." (by Keith Knight using Anagram Genius) (2005)