Cost Basis Guide

If you acquired AT&T Inc. (formerly SBC Communications Inc.) shares as a result of SBC's acquisition of Ameritech Corporation (AIT), use this worksheet.

Ameritech Corporation (AIT)

Besides the original date when you acquired your AT&T Inc. shares, you also will need to know your original cost per share. If you acquired shares at different times, you will need to do a separate calculation for each situation.
Original Cost per Share
(including brokerage fees)
$  
Starting with the first event after you acquired your shares, click at the appropriate step. Your new cost basis will be automatically calculated.
Click Here if you owned AT&T shares before Jan. 1, 1984 (the divestiture of Ameritech Corporation and other regional telephone operating companies).
$ per AT&T share x 1.033 = $ New Cost Basis
Note: The Ameritech Corporation allocation factor at divestiture was 0.1033, which must be multiplied by 10 because stockholders received one-tenth share in each of the regional companies for each share of "old" AT&T.
Click Here if you acquired AIT shares after Jan. 1, 1984 (the divestiture of Ameritech Corporation and other regional telephone operating companies) and before Jan. 26, 1987 (AIT 3-for-2 stock split distribution date).
$ (per share) ÷ 1.5 = $ New Cost Basis
Click Here if you acquired AIT shares after Jan. 26, 1987 (AIT 3-for-2 stock split distribution date), and before Jan. 26, 1989 (AIT 2-for-1 stock split distribution date).
$ (per share) ÷ 2 = $ New Cost Basis
Click Here if you acquired AIT shares after Jan. 26, 1989 (AIT 2-for-1 stock split distribution date), and before Jan. 24, 1994 (AIT 2-for-1 stock split distribution date).
$ (per share) ÷ 2 = $ New Cost Basis
Click Here if you acquired AIT shares after Jan. 24, 1994 (AIT 2-for 1 stock split distribution date), and before Jan. 26, 1998 (AIT 2-for-1 stock split distribution date).
$ (per share) ÷ 2 = $ New Cost Basis
Click Here if you acquired AIT shares after Jan. 26, 1998 (AIT 2-for-1 stock split distribution date), and on or before Oct. 8, 1999 (effective date of the acquisition of AIT by SBC).
$ (per share) ÷ 1.316 = $ New Cost Basis
Note: As a result of the acquisition of AIT by SBC effective Oct. 8, 1999, you received 1.316 shares of SBC common stock for each share of AIT common stock.