The October 15, 2010 extended electronic filing deadline for combined corporate taxpayers that are required to electronically file form 355U for their 2009 tax year is fast approaching. DOR is successfully receiving electronically filed unitary returns. Please work with your approved software vendors to transmit Form 355U to us as paper filings cannot be processed. Should you need assistance, please call the Customer Service Bureau at (617) 887-6367 and press option 3. If DOR learns of any specific issues and recommended solutions with respect to the electronic submission of a combined report, we will post these on DOR's website to assist taxpayers in completing the electronic filing.