Plan your response to a CRA or IRS audit — deadlines, scope, records to gather, when to bring in a professional, and how to avoid an arbitrary assessment.
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The single most important step in any audit is understanding exactly what the tax authority is asking. A desk review of one deduction is a very different matter from a full field audit of every line on your return, and treating the two the same wastes effort or exposes you needlessly. Read the letter twice, list the precise years and line items in scope, and note the response deadline. Respond only to what was asked — volunteering unrelated years, accounts, or issues is one of the most common ways taxpayers turn a narrow review into a broad one.
Deadlines are not suggestions. In both Canada and the United States, missing an audit deadline allows the agency to assess using its own figures — an arbitrary or 'best information available' assessment that is almost always higher than the truth and then must be fought on appeal. If you cannot fully respond in time, request an extension in writing before the deadline; reasonable requests are routinely granted, and a documented extension protects you from a default assessment.
Audits are won and lost on documentation. For every amount questioned, the auditor wants a receipt or record and, for expenses, a business purpose. Where records are missing, reconstruct them from bank statements, invoices, third-party records, and reasonable industry benchmarks rather than guessing — an unsupported estimate handed to an auditor invites an adjustment against you. Present organized, cross-referenced documents; a disorganized box signals that more may be wrong and encourages a deeper look.
Unreported income is the highest-risk category because both the CRA and the IRS use indirect methods — bank-deposit analysis and net-worth comparisons — to infer income you did not report. If deposits exceed reported income, be ready to explain non-taxable sources such as loans, gifts, transfers between your own accounts, or the return of capital. Unexplained gaps are what drive gross-negligence and civil-fraud penalties, so documenting the source of every significant deposit is central to protecting yourself.
Most audits are civil: the worst outcome is additional tax, interest, and penalties. But any sign of a fraud referral — an auditor from a criminal-investigations unit, unusual questions about intent, or a sudden freeze on communication — changes everything. At that point you have a right to silence and to counsel, and casual answers can be used against you. Do not meet investigators alone or try to talk your way out; engage a tax lawyer before any further contact.
Even in an ordinary audit, know your exit. If the auditor's proposed adjustment is wrong, you are not stuck with it: both systems give you a formal right to object or appeal within a strict deadline that runs from the assessment. Keep every submission and reply in writing throughout the audit so that, if you do dispute the result, you already have a clean, complete record to build on. This assessment is educational only and is not tax advice.
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This planner provides general educational information about tax audits in Canada and the US only — it is not tax advice, legal advice, or a prediction of your audit outcome. Audit procedures, deadlines, and penalties differ by agency and jurisdiction. Consult a tax lawyer or accountant licensed in your jurisdiction before responding.
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