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(a) Processing of returns. When the returns are filed in the office of the district director of internal revenue or the office of the director of a regional service center, they are checked first for form, execution, and mathematical accuracy. Mathematical errors are corrected and a correction notice of any such error is sent to the taxpayer. Notice and demand is made for the payment of any additional tax so resulting, or refund is made of any overpayment. Returns are classified for examination at regional service centers. Certain individual income tax returns with potential unallowable items are delivered to Examination Divisions at regional service centers for correction by correspondence. Otherwise, returns with the highest examination potential are delivered to district Examinations Divisions based on workload capacities. Those most in need of examination are selected for office or field examination.