The arrival of year end presents special opportunities for most taxpayers to take steps in lowering their tax liability. The tax law imposes tax liability based upon a "tax year." For most individuals and small business, their tax year is the same as the calendar year. As 2013 year end gets closer, most taxpayers have a more accurate picture of what their tax liability will be in 2013 than at any other time during the current year. However, if you don't like what you see, you have until year end to make improvements before your tax liability for 2013 is permanently set in stone.