§ 144.640 RSMo — Taxpayer to keep records, examination

Every taxpayer subject to the tax imposed by this law shall keep and preserve suitable records and other books and accounts necessary to determine the amount of tax for which he is liable under the provisions of this law. Every taxpayer shall preserve the books and records for a period of three years unless the director of revenue, in writing, authorizes their destruction at an earlier date. The books and records shall be open for examination at any time by the director of revenue or his agent during the business hours of the day.