There are no links to the official documents for the years 1989 through 1995. The information below can only be used as help for further research, as there is not enough information here to rely on for official guidance. For that you need to obtain a copy of the complete document.

INCOME TAX

Rev. Rul. 89-120
Travel expenses; reimbursement; mileage allowances. For expenses paid or incurred after 1988, mileage allowances not exceeding 25.5 cents per mile for local travel or transportation paid by employers to employees will satisfy the substantiation and adequate accounting requirements of section 1.274-5T of the regulations. Rev. Rul. 80-62, as modified by Rev. Ruls. 80-203, 84-51, 85-155, 87-93, and 88-92, is further modified.

Rev. Rul. 89-121
Exchange of similar businesses under section 1031 of the Code. The transfer of the assets of a business in exchange for the assets of a similar business cannot be treated as an exchange of a single property for another single property under section 1031 of the Code. Rev. Ruls. 57-365 and 85-135 clarified.

Rev. Rul. 89-122
Banks; material modification of debt; gain or loss recognition; amount realized; original issue discount; net operating loss. Certain federal income tax consequences are set forth for various debt modifications that are part of a foreign country's program to reduce the amount of its outstanding U. S. dollar denominated debt. Rev. Rul. 79-292 clarified.

Rev. Rul. 89-123
Limited partnerships. The states of Delaware, Illinois, and Missouri are added to the list of states that have enacted legislation that corresponds to the Uniform Limited Partnership Act (ULPA) for purposes of section 301.7701-2 of the regulations. Rev. Rul. 84-80 and its amplifications are superseded.

Rev. Rul. 89-124
Investment trusts; power to vary the investment. The power to transfer additional securities into an investment trust in exchange for interests in the trust is not a power to vary the investment within the meaning of section 301.7701-4(c) of the regulations if the power is exercisable for only a limited period at the inception of the trust and if the additional securities are substantially similar to those initially deposited in the trust.

Announcement 89-143
A list is provided of organizations that no longer qualify as organizations contributions to which are deductible under section 170(c)(2) of the Code.

Announcement 89-146
Various areas of the states of Alaska, California, Connecticut, Louisiana, Maine, Maryland, North Carolina, Ohio, South Carolina, Texas and Vermont, and the District of Columbia, Commonwealth of Puerto Rico, and the Territory of the Virgin Islands have been declared disaster areas in which losses qualify for the special tax treatment under section 165(i) of the Code.

EXCISE TAXES

Announcement 89-144
Petitions to add perchloroethylene, methyl chloroform, and trichloroethylene to the list of taxable substances in section 4672(a)(3) of the Code have been filed.

ADMINISTRATIVE

Rev. Proc. 89-62
Automobile expenses; standard mileage rate. The standard mileage rate for the first 15,000 miles of business use of an automobile that is not fully depreciated will be 25.5 cents per mile and 11 cents per mile for business use in excess of 15,000 miles. The amount attributable to depreciation is 11 cents per mile for 1989. Rev. Proc. 82-61, as modified by Rev. Procs. 83-74, 84-72, 85-49, 86-38, 87-49, and 88-52, is further modified.

Rev. Proc. 89-63
Areas in which advance rulings will not be issued; exchange of businesses. The manner in which like-kind property (other than real property) will be determined under section 1031 of the Code in a transaction involving the exchange of the assets of similar or identical businesses. Rev. Proc. 89-3 amplified.

Rev. Proc. 89-64
Automobile owners and lessees. This revenue procedure prescribes limitations on depreciation deductions for passenger automobiles that are first placed in service during 1989 and provides a table for use in determining the amounts included in income by lessees of passenger automobiles that are first leased during calendar year 1989.

Treasury expects to issue a Notice of Proposed Rulemaking under the Bank Secrecy Act to address the problem of money laundering through international payments and requests comments on a number of regulatory options.

Announcement 89-142
The Service has changed Worksheet 3 of Form 8582, Passive Activity Loss Limitations, which allocates among rental real estate activities the $25,000 (or less) offset allowed by section 469(i) of the Code. This announcement describes the change and specifies the affected taxpayers.

Announcement 89-145
Certain offices in the national office of the Internal Revenue Service have been established.