Taxpayers who have not yet filed their individual income tax returns for 2017 (or the three prior years) can file those returns on NETFILE until Friday, January 25, 2019. Until that date, the Canada Revenue Agency’s (CRA’s) NETFILE service will accept such returns for the 2014, 2015, 2016, and 2017 taxation years.
After January 25, the NETFILE service will be unavailable for a period of several weeks, while it is re-configured for the filing of returns for the 2018 tax year.
More information on how to file a prior-year return on NETFILE can be found on the CRA website at https://www.canada.ca/en/revenue-agency/services/e-services/e-services-individuals/netfile-overview.html.