26 CFR § 41.6001-1 - Records.
(a) Records to be kept. Every person in whose name a highway motor vehicle having a taxable gross weight of at least 55,000 pounds is registered or required to be registered at any time during the taxable period shall keep records sufficient to enable the Commissioner to determine whether such person is liable for the tax and, if so, the amount thereof. See § 41.4482(b)–1 for the definition of taxable gross weight. Such records shall show with respect to each such vehicle:
(1) A description of the vehicle (including serial number or manufacturer's number) in sufficient detail to permit positive identification of the vehicle.
(2) The weight of the loads carried by the vehicle in such form as is required under the laws of any State in which the vehicle is registered or required to be registered, in order to permit verification of such vehicle's taxable gross weight.
(4) The first month of each taxable period in which occurred a taxable use of each such vehicle while the vehicle was registered in the name of such person; information showing whether such vehicle was operated, while registered in the name of such person, in any prior month in such taxable period; and if such vehicle was so operated, evidence establishing that such operation was not a taxable use.
(5) The date of sale or other transfer to another of any such vehicle, together with the name and address of the person to whom transferred.
(6) In the case of any such vehicle disposed of otherwise than by sale or other transfer (including disposition by theft or destruction), the date and method of disposition of the vehicle.
(7) In the case of a secondhand highway motor vehicle acquired at any time in the taxable period, evidence showing whether there was a prior taxable use in such taxable period of the highway motor vehicle (see paragraph (b) of § 41.4481–2) or whether there was a suspension of tax in effect (see § 41.4483–3).
(8) A copy of each return, schedule, statement, or other document filed, pursuant to the regulations in this part or in accordance with the instructions applicable to any form prescribed thereunder, by the person required to keep such records.
(b) Transit systems. Every person engaged in the operation of a transit system who claims exemption from tax with respect to a transit-type bus shall keep records sufficient to show, with respect to each taxable period, whether it meets the 60-percent passenger fare revenue test (see paragraph (e) of § 41.4483–2) for the period prescribed as the test period (see paragraph (c) of § 41.4483–2) for such system for such taxable period.
(c) Exemption for vehicles used 5,000 miles or less. The owner of a highway motor vehicle who reasonably expects the vehicle to be exempt from the tax under section 4481(a) by reason of § 41.4483–3(c) for a given taxable period shall keep records which indicate the reason that the use of the vehicle is not expected to exceed 5,000 miles on public highways.
(d) Records of claimants. Any person claiming refund, credit, or abatement of the tax, interest, additional amount, addition to the tax, or assessable penalty, shall keep a complete and detailed record with respect to the claim.
(e) Place and period for keeping records.
(1) All records required by the regulations in this part shall be kept, by the person required to keep them, at a convenient and safe location within the United States which is accessible to internal revenue officers. Such records shall at all times be available for inspection by such officers. If such person has a principal place of business in the United States, the records shall be kept at such place of business.
(2) Records required by paragraph (a) of this section shall be maintained for a period of at least 3 years after the date the tax becomes due or the date the tax is paid, whichever is the later. Records required by paragraphs (b) and (c) of this section shall be maintained for a period of at least 3 years after the end of the taxable period for which such exemption applies. Records required by paragraph (d) of this section (including any record required by paragraphs (a), (b), or (c) of this section which relates to a claim) shall be maintained for a period of at least 3 years after the date the claim is filed.