Most taxpayers think about audits only after an envelope from the IRS shows up. By then, the outcome is already largely decided — not by what you say to the examiner, but by what records you kept two or three years ago. An audit is not an accusation. It is a request to prove what you reported. Taxpayers who lose audits usually did not cheat; they simply cannot substantiate a deduction they were entitled to, or they cannot explain a bank deposit that was never income in the fi