TAX APPEALS DEADLINE IS APRIL 1, 2016. We can provide a free telephone consultation to help you decide whether to file a municipal property tax appeal or not. The general deadline for filing a formal tax appeal challenge is April 1, 2016, for this upcoming 2016 tax year assessments. The deadline is May 1, 2016 , if your municipality is undergoing a town wide revaluation. Ken Porro and Dan Granatell are available to assist you in addressing your property tax appeal questions. Please contact Ken or Dan for a free consultation.