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Directory Results for Revenue Procedure 1998-62 - Penalties; substantial understatement.. Guidance is provided concerning when ination shown on a return in accordance with the applicable forms and instructions will be adequate disclosure for purposes of to Revenue Procedure 1998-63 - Option standard mileage rates.. This procedure announces 31 cents as the optional rate for deducting or accounting for expenses for business use of an automobile, 14 cents as the optional rate for deducting or