Home › Forums › General Discussion › What is the Average Processing Time for an Amended tax return? › Reply To: What is the Average Processing Time for an Amended tax return? RefundtalkKeymaster @admin August 21, 2017 at 1:05 am #6660 A Form 1040X, Amended U.S. Individual Income Tax Return can take up to 16 weeks to process once the IRS has received it. If You Found The Information Here Was Useful Please Consider Sharing This Page! Tweet