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The IRS tries to act on audits as quickly as possible. This means that most audits happen on returns filed within the last two years. Exceptions to the Three Year Statute of Limitations. The IRS has the right to audit back as far as six years if the taxpayer omitted more than 25% of their income for a single year. Taxpayers who leave out greater than $5,000 earned in foreign countries may also be audited as far back as six years. Not filing a tax return is not a good way to avoid an audit. In fact, because the return was never filed, the statute of limitations has not even begun to run.
How far back can the Canada Revenue Agency go in a tax audit? In general, Revenue Canada can go as far back as four years as of the date of filing; however, exceptions can be made if the CRA determines that a fraud may have occurred or the CRA auditor files a waiver prior to the upcoming deadline explaining the particular circumstances as to why an exception should be made.