Treatment of certain expenses of rural mail carriers

the amount allowable as a deduction under this chapter for the use of a vehicle in performing such services shall be equal to the amount of such qualified reimbursements; and

such qualified reimbursements shall be treated as paid under a reimbursement or other expense allowance arrangement for purposes of section 62(a)(2)(A) (and section 62(c) shall not apply to such qualified reimbursements).

Notwithstanding paragraph (1)(A), if the expenses incurred by an employee for the use of a vehicle in performing services described in paragraph (1) exceed the qualified reimbursements for such expenses, such excess shall be taken into account in computing the miscellaneous itemized deductions of the employee under section 67.

For purposes of this subsection, the term “qualified reimbursements” means the amounts paid by the United States Postal Service to employees as an equipment maintenance allowance under the 1991 collective bargaining agreement between the United States Postal Service and the National Rural Letter Carriers’ Association. Amounts paid as an equipment maintenance allowance by such Postal Service under later collective bargaining agreements that supersede the 1991 agreement shall be considered qualified reimbursements if such amounts do not exceed the amounts that would have been paid under the 1991 agreement, adjusted by increasing any such amount under the 1991 agreement by an amount equal to—

(A) such amount, multiplied by

(B) the cost-of-living adjustment determined under section 1(f)(3) for the calendar year in which the taxable year begins, by substituting “calendar year 1990” for “calendar year 2016” in subparagraph (A)(ii) thereof.