Section 179 limits for the year 2013 were increased by the 'American Taxpayer Relief Act' which allowed businesses to write-off up to $500,000 of qualified capital expenditures subject to a dollar-for-dollar phase-out once these expenditures exceeded $2,000,000 in the 2013 tax year.
Bonus Depreciation was also reinstated to 50% by the 'American Taxpayer Relief Act' which allowed larger businesses that exceeded the $2,000,000 cap to write-off 50% of qualified assets using first year Bonus Depreciation. Also, small businesses that were not profitable in 2013 could use 50% Bonus Depreciation (on new equipment only) and carry-forward the loss to future profitable years.
This should mean you got a substantial boost to your bottom line in the 2013 tax year. But, to get the deduction for tax year 2013, you had to act in 2013, as once the clock struck midnight on December 31, 2013; Section 179 couldn't increase your 2013 profits anymore.