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Introduction

SECTION 3. BACKGROUND AND

Internal Revenue Bulletin 2005-51 · 2026-10-03 edition · updated 2026-10-04 · United States

CHANGES

.01 Section 162(a) allows a deduction for all the ordinary and necessary expenses paid or incurred during the taxable year in carrying on any trade or business. Under that provision, an employee or self-employed individual may deduct the cost of operating an automobile to the extent that it is used in a trade or business. However, under § 262, no portion of the cost of operating an automobile that is attributable to personal use is deductible.

.02 Section 274(d) provides, in part, that no deduction is allowed under § 162 with respect to any listed property (as defined in § 280F(d)(4) to include passenger automobiles and any other property used as a means of transportation) unless the taxpayer complies with certain substantiation requirements. Section 274(d) further provides that regulations may prescribe that some or all of the substantiation requirements do not apply to an expense that does not exceed an amount prescribed by the regulations.

.03 Section 1.274–5(j), in part, grants the Commissioner of Internal Revenue the authority to establish a method under which a taxpayer may use mileage rates to substantiate, for purposes of § 274(d), the amount of the ordinary and necessary expenses of using a vehicle for local transportation and transportation to, from, and at the destination while traveling away from home.

.04 Section 1.274–5(g), in part, grants the Commissioner the authority to prescribe rules relating to mileage allowances for ordinary and necessary expenses of using a vehicle for local transportation and transportation to, from, and at the destination while traveling away from home. Pursuant to this grant of authority, the Commissioner may prescribe rules under which the allowances, if in accordance with reasonable business practice, will be regarded as (1) equivalent to substantiation, by adequate records or other sufficient evidence, of the amount of the travel and transportation expenses for purposes of § 1.274–5(c), and (2) satisfying the requirements of an adequate accounting to the employer of the amount of the expenses for purposes of § 1.274–5(f).

.05 Section 62(a)(2)(A) allows an employee, in determining adjusted gross in

come, a deduction for the expenses allowed by Part VI (§ 161 and following), subchapter B, chapter 1 of the Code, paid or incurred by the employee in connection with the performance of services as an employee under a reimbursement or other expense allowance arrangement with a payor.

.06 Section 62(c) provides that an arrangement will not be treated as a reimbursement or other expense allowance arrangement for purposes of § 62(a)(2)(A) if it—

(1) does not require the employee to substantiate the expenses covered by the arrangement to the payor, or

(2) provides the employee with the right to retain any amount in excess of the substantiated expenses covered under the arrangement.

Section 62(c) further provides that the substantiation requirements described therein do not apply to any expense to the extent that, under the grant of regulatory authority in § 274(d), the Commissioner has provided that substantiation is not required for the expense.

.07 Under § 1.62–2(c)(1), a reimbursement or other expense allowance arrangement satisfies the requirements of § 62(c) if it meets the requirements of business connection, substantiation, and returning amounts in excess of expenses as specified in the regulations. Section 1.62–2(e)(2) specifically provides that substantiation of certain business expenses in accordance with rules prescribed under the authority of § 1.274–5(g) will be treated as substantiation of the amount of the expenses for purposes of § 1.62–2. Under § 1.62–2(f)(2), the Commissioner may prescribe rules under which an arrangement providing mileage allowances will be treated as satisfying the requirement of returning amounts in excess of expenses, even though the arrangement does not require the employee to return the portion of the allowance that relates to miles of travel substantiated and that exceeds the amount of the employee’s expenses deemed substantiated pursuant to rules prescribed under § 274(d), provided the allowance is reasonably calculated not to exceed the amount of the employee’s expenses or anticipated expenses and the employee is required to return any portion of the allowance that relates to miles of travel not substantiated.

December 19, 2005 1178 2005–51 I.R.B.

sis and is in lieu of all operating and fixed costs of the automobile allocable to business purposes (except as provided in section 9.06 of this revenue procedure). Items such as depreciation (or lease payments), maintenance and repairs, tires, gasoline (including all taxes thereon), oil, insurance, and license and registration fees are included in operating and fixed costs for this purpose.

.04 Parking fees, tolls, interest, and taxes . Parking fees and tolls attributable to use of the automobile for business purposes may be deducted as separate items. Likewise, interest relating to the purchase of the automobile as well as state and local personal property taxes may be deducted as separate items, but only to the extent allowable under § 163 or § 164, respectively. Section 163(h)(2)(A) expressly provides that interest is nondeductible personal interest if it is paid or accrued on indebtedness properly allocable to the trade or business of performing services as an employee. Section 164 expressly provides that state and local taxes that are paid or accrued by a taxpayer in connection with an acquisition or disposition of property will be treated as part of the cost of the acquired property or as a reduction in the amount realized on the disposition of the property. If the automobile is operated less than 100 percent for business purposes, an allocation is required to determine the business and nonbusiness portion of the taxes and interest deduction allowable.

.05 Depreciation . For owned automobiles placed in service for business purposes, and for which the business standard mileage rate has been used for any year, depreciation will be considered to have been allowed at the rate of 15 cents per mile for 2002, 16 cents per mile for 2003 and 2004, and 17 cents per mile for 2005 and 2006, for those years in which the business standard mileage rate was used. If actual costs were used for one or more of those years, the rates above do not apply to any year in which actual costs were used. The depreciation described above will reduce the basis of the automobile (but not below zero) in determining adjusted basis as required by § 1016.

.06 Limitations . (1) The business standard mileage rate may not be used to compute the deductible expenses of (a) automobiles used for hire, such as taxicabs, or (b) five or more auto

for deduction purposes and 48.5 cents for reimbursement purposes.

.11 Section 5.06(3) of this revenue procedure clarifies the limitation on use of the business standard mileage rate by a taxpayer that has claimed the special depreciation allowance under § 168(k). Section 8.04(1) clarifies the limitation on use of a fixed and variable rate (FAVR) allowance with respect to an automobile for which an employee has claimed the special depreciation allowance under § 168(k). Section 8.05(4) clarifies the requirement that an employer’s FAVR allowance or allowances must cover at least five or more employees. Section 8.05(5) clarifies the requirement that an employee may not participate in a FAVR allowance unless the cost of the employee’s automobile was at least 90 percent of the standard automobile cost.

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