A bill to provide rules for computing the amount of the deductions allowed to rural mail carriers for use of their automobiles.

Provides that, for taxable years prior to 1985, rural letter carriers are permitted to compute the amount of the deduction for the use of their automobile in performing services involving the collection and delivery of mail on a rural route by: (1) using the amount received as equipment maintenance allowances from the United States Postal Service; or (2) using the form entitled "Worksheet for Use of Rural Carrier in Reporting Equipment Allowance and Claiming Transportation Expense Deduction."

Provides that, for taxable years beginning after 1984, rural letter carriers are permitted to compute the amount of their deduction for use of their automobile in performing such services: (1) by using a standard mileage rate for all such miles of such use equal to 150 percent of the basic standard rate; or (2) by calculating the equipment allowance deduction equal to the operating expenses.

Removes the 50 percent of business use limitation contained in the Internal Revenue Code for rural letter carriers who claim the investment tax credit and the depreciation deduction for their automobiles.