When can the CRA no longer reassess you?

Note, first of all, that the clock is not “restarted” by a reassessment. If the CRA reassesses you at some point during the three-year period, the time limit for any further reassessment is still three years from the original assessment date.

There are some exceptions to the three-year rule. The following are the most notable:

• Fraud. If you have committed any fraud in filing your return or in supplying any information under the Income Tax Act, you can be reassessed at any time. The clock never runs out. If you go to court, the CRA must prove that you committed fraud.
• Neglect, carelessness or willful default. If you have made a misrepresentation that is attributable to “neglect, carelessness or willful default”, you can be reassessed at any time. Again, the clock never stops running. If you go to court, the onus is on the CRA to prove that there has been neglect, carelessness or willful default on your part. Note, however, that the term “carelessness” is quite broad. There is extensive case law interpreting the meaning of these words.
• Tax shelters. If you’re involved in a tax shelter where you’re required to file a tax shelter information form with the CRA, and you don’t, then you can be reassessed at any time. (The deadline is three years after you file the form, so if you never do, the clock never starts running.)
• Failing to file an accurate T1135. If you own foreign property with total cost over $100,000, and you don’t properly report all of it on Form T1135 with the level of detail the form requires, and you have any foreign income that you haven’t reported, then you can be reassessed up to six years from the original assessment date.
• Dealings with related non-residents. If the reassessment relates to a transaction between you and a non-resident with whom you “did not deal at arm’s length” (typically a family member, or a corporation or trust controlled by you or a family member), then the reassessment can be issued up to six years from the original assessment date.
• Loss carrybacks. If you are carrying back a loss, which generally can be done to any of the three years preceding the loss, then your return will have to be reassessed to allow this. A reassessment resulting from any one of a large number of such carryback provisions can be done up to six years from the original assessment date. (Normally it’s to your benefit to have such a reassessment.)
• Foreign tax credits. If your tax payable to another country changes (e.g., due to a reassessment by that country), your foreign tax credits may change. The CRA can reassess you to reflect these changes (which could be good or bad for you) up to six years from the original assessment.
• Consequential assessments. If a reassessment is made to a return that is still open for reassessment, and as a result a “balance” changes which is carried over (forward or back) to another year, then that other year can be reassessed even if it would otherwise be past the deadline.
• Waiver. If before the deadline expires you sign a waiver with respect to any taxation year, that year will remain “open” forever for the CRA to reassess, unless you revoke the waiver (which requires six months’ notice). Usually you should only sign a waiver with respect to a particular, identified issue, rather than giving the CRA blanket power to reassess a given year. Also, remember that you are under no obligation to sign a waiver. If the deadline is approaching and you think it will expire before the CRA can get an assessment issued, you might choose not to sign a waiver.
• Time spent contesting a demand for information. If the CRA makes a formal demand for information from you (via a Requirement for Information, or seeking a Compliance Order from the Federal Court), and you bring a Court application to try to have the CRA’s demand struck down, any time spent in that legal process stops the clock from running, so the deadline is extended.
• Corporations that are not CCPCs. For a Canadian-controlled private corporation (CCPC), the limit is three years, as it is for individuals and most trusts. For any other corporation (or a mutual fund trust), the limit is four years. This would apply, for example, to a corporation controlled by a non-resident or by a public corporation. For such corporations, the limit is one year more than for individuals; thus, in the examples above where individuals have six years, it is seven years.

There are numerous other exceptions as well, many of them buried in transitional rules of application that amend the Income Tax Act. All of which goes to show that you must be careful on your return, and don’t rely too heavily on the three-year assessment period expiring!