Year 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 Month Select January Feburary March April May June July August September October November December Update on tax return assessments Date22 December 2017 A small number of taxpayers who have received their assessment have yet to receive a 2018 ITIS effective rate to give to their employer Tax payment deadline Date06 December 2017 Outstanding amounts can be paid online on this website