Keep records for all taxable highway vehicles registered in your name for at least 3 years after the date the tax is due or paid, whichever is later. They must be available at all times for inspection by the IRS. Also keep copies of all returns and schedules you have filed. Keep your records even if a vehicle is registered in your name for only a portion of a period. If the tax is suspended on a highway motor vehicle for a period because its use on public highways during the period did not exceed 5,000 miles (7,500 miles for agricultural vehicles), the registrant must keep the records at least 3 years after the end of the period to which the suspension applies.