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Nexchap,

Yes. Unfortunately, neither Form 8949 nor Schedule D has a column for "Adjustments to Cost Basis." They both only have columns headed "Cost or other basis" and "Adjustment to gain or loss." I looked through the IRS instruction on form 8949 and seems that there is a condition which applies that might answer how to do this: 

I.e.— 

You received a Form 1099-B (or substitute statement) and the basis shown in box 1e is incorrect

The instructions are: 

If this transaction is reported on a Part I with box B checked at the top or if this transaction is reported on a Part II with box E checked at the top, enter the correct basis in column (e), and enter -0- in column (g). 

 

Based on this, my instinct would be to put the appropriate adjusted basis number for ST and then LT into the respective Cost or Other Basis boxes, figuring the allocation of total adjustment for ST and LT shares by percentage (i.e. 46 and 54%)

 

Does this seem right to you?