All Government of Canada websites, including Canada Revenue Agency’s, are being migrated to a new website (www.Canada.ca). The merging is intended to be completed by the end of 2016. Current registration and log-in information for your CRA account is expected to be valid in the new website.
The merger is part of a previous government initiative to consolidate individual department and agency websites and make it easier for the public to find and access government information and services on multiple platforms (computers, tablets, smart phones, etc.).
For more information, see: http://www1.canada.ca/en/newsite.html.