The CRA says the move was taken to protect the confidentiality of taxpayer information, and affects a wide range of online services including EFILE, NETFILE, My Account, My Business Account and Represent a Client.
The agency is currently implementing a patch for the flaw and says it's "vigorously testing all systms" to make sure they'll be secure when the site is relaunched.
"The Minister of National Revenue has also confirmed that interest and penalties will not be applied to individual taxpayers filing their 2013 tax returns after April 30, 2014 for a period equal to the length of this service interruption," the CRA said in a statement.
At the same time, the U.S. Internal Revenue Service (IRS) issued a statement saying it's not affected by the bug. "We continue to monitor the situation and remain in contact with our software partners," the IRS stated. "The IRS advises taxpayers to continue filing their tax returns as they normally would in advance of the April 15 deadline."
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