按这个REMIND 说的, 5 月 5 日之前 PAY 就可以了:
http://www.cra-arc.gc.ca/nwsrm/txtps/2014/tfsk25-eng.html?rss
The Canada Revenue Agency (CRA) encourages you to use its quick, easy, and secure electronic services to file your income tax and benefit return on time and pay any amount owing. You have until
midnight on or before
May 5, 2014, to file your 2013 income tax and benefit return and
pay any balance owing. As a result of the five-day service interruption in April, interest and penalties will not be applied to individual taxpayers filing their 2013 tax returns by midnight on or before May 5.