Incorrect fiscal year on Form SS-4

[DexEA]

December should have been entered as the closing month on form SS-4, but an incorrect month of April was entered. A letter with the FEIN number was received from the IRS asking for a 2013 tax return. Should a letter correcting the mistake be written? Or will a return filed with the calendar year by 4/15/2014 correct this?

[John of PA]

My experience has been the 1st retrun filed estabilshes the tax year and will override what is on the SS4, so no letter would be needed.