The decision follows Congress renewing a number of "extender" provisions of the tax law that expired at the end of 2013. These provisions were renewed by Congress through the end of 2014. The final legislation was signed into law December 19, 2014.
"We have reviewed the late tax law changes and determined there was nothing preventing us from continuing our updating and testing of our systems," IRS Commissioner John Koskinen. "Our employees will continue an aggressive schedule of testing and preparation of our systems during the next month to complete the final stages needed for the 2015 tax season."