SECTION 10. WITHHOLDING AND

PAYMENT OF EMPLOYMENT TAXES

.01 The portion of a mileage allowance (other than a FAVR allowance), if any, that relates to the miles of business travel substantiated and that exceeds the amount deemed substantiated for those miles under section 9.01(1) of this revenue procedure is subject to withholding and payment of employment taxes. See § 1.62–2(h)(2)(i)(B).

(1) In the case of a mileage allowance paid as a reimbursement, the excess described in section 10.01 of this revenue procedure is subject to withholding and payment of employment taxes in the payroll period in which the payor reimburses the expenses for the business miles substantiated. See § 1.62–2(h)(2)(i)(B)(2).

(2) In the case of a mileage allowance paid as an advance, the excess described in section 10.01 of this revenue procedure is subject to withholding and payment of employment taxes no later than the first payroll period following the payroll period in which the business miles with respect to which the advance was paid are substantiated. See § 1.62–2(h)(2)(i)(B)(3). If some or all of the business miles with respect to which the advance was paid are not substantiated within a reasonable period of time and the employee does not return the portion of the allowance that relates to those miles within a reasonable period of time, the portion of the allowance that relates to those miles is subject to withholding and payment of employment taxes no later than the first payroll period following the end of the reasonable period. See § 1.62–2(h)(2)(i)(A).

(3) In the case of a mileage allowance that is not computed on the basis of a fixed amount per mile of travel (for example, a mileage allowance that combines periodic fixed and variable rate payments, but that does not satisfy the requirements of section 8 of this revenue procedure), the payor must compute periodically (no less frequently than quarterly) the amount, if any, that exceeds the amount deemed substantiated under section 9.01(1) of this revenue procedure by comparing the total mileage allowance paid for the period to the standard mileage rate in section 5.01 of this revenue procedure multiplied by the number of business miles substantiated by the employee for the period. Any excess

payment received that relates to miles in excess of the business miles substantiated by the employee, and (b) the portion (if any) of a periodic fixed payment that relates to a period during which the employee was not covered by the FAVR allowance.

.04 An employee is not required to include in gross income the portion of a mileage allowance received from a payor that is less than or equal to the amount deemed substantiated under section 9.01 of this revenue procedure, provided the employee substantiates in accordance with section 9.02. See § 1.274–5T(f)(2)(i). In addition, that portion of the allowance is treated as paid under an accountable plan, is not reported as wages or other compensation on the employee’s Form W–2, and is exempt from withholding and payment of employment taxes. See § 1.62–2(c)(2) and (c)(4).

.05 An employee is required to include in gross income the portion of a mileage allowance received from a payor that exceeds the amount deemed substantiated under section 9.01 of this revenue procedure, provided the employee substantiates in accordance with section 9.02 of this revenue procedure. See § 1.274–5T(f)(2)(ii). In addition, the excess portion of the allowance is treated as paid under a nonaccountable plan, is reported as wages or other compensation on the employee’s Form W–2, and is subject to withholding and payment of employment taxes. See § 1.62–2(c)(3)(ii), (c)(5), and (h)(2)(i)(B).

.06 If an employee’s substantiated expenses are less than the employee’s actual expenses, the following rules apply:

(1) Except as otherwise provided in section 9.06(2) of this revenue procedure with respect to leased automobiles, if the amount of the expenses deemed substantiated under the rules provided in section 9.01 of this revenue procedure is less than the amount of the employee’s business transportation expenses, the employee may claim an itemized deduction for the amount by which the business transportation expenses exceed the amount that is deemed substantiated, provided the employee substantiates all the business transportation expenses, includes on Form 2106, Employee Business Ex- penses, the deemed substantiated portion of the mileage allowance received from the payor, and includes in gross income

the portion (if any) of the mileage allowance received from the payor that exceeds the amount deemed substantiated. See § 1.274–5T(f)(2)(iii). However, for purposes of claiming this itemized deduction, substantiation of the amount of the expenses is not required if the employee is claiming a deduction that is equal to or less than the applicable standard mileage rate multiplied by the number of business miles substantiated by the employee minus the amount deemed substantiated under section 9.01 of this revenue procedure. The itemized deduction is subject to the 2-percent floor on miscellaneous itemized deductions provided in § 67.

(2) An employee whose business transportation expenses with respect to a leased automobile are deemed substantiated under section 9.01(1) of this revenue procedure (relating to an allowance other than a FAVR allowance) may not claim a deduction based on actual expenses under section 9.06(1) unless the employee does so consistently beginning with the first business use of the automobile after December 31, 1997. An employee whose business transportation expenses with respect to a leased automobile are deemed substantiated under section 9.01(2) of this revenue procedure (relating to a FAVR allowance) may not claim a deduction based on actual expenses.

.07 An employee may deduct an amount computed pursuant to section 5.01 of this revenue procedure only as an itemized deduction. This itemized deduction is subject to the 2-percent floor on miscellaneous itemized deductions provided in § 67.

.08 A self-employed individual may deduct an amount computed pursuant to section 5.01 of this revenue procedure in determining adjusted gross income under § 62(a)(1).

.09 If a payor’s reimbursement or other expense allowance arrangement evidences a pattern of abuse of the rules of § 62(c) and the regulations thereunder, all payments under the arrangement will be treated as made under a nonaccountable plan. Thus, the payments are included in the employee’s gross income, are reported as wages or other compensation on the employee’s Form W–2, and are subject to withholding and payment of employment taxes. See § 1.62–2(c)(3), (c)(5), and (h)(2).

December 19, 2005 1184 2005–51 I.R.B.

to a charitable volunteer (a) on or after January 1, 2006, and (b) with respect to transportation expenses paid or incurred by the employee or charitable volunteer on or after January 1, 2006.