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Well, it depends upon how the 1099s are issued. In theory, if you were 50-50 owners & it wasn't either of your personal primary residences, the 1099-S should be issued equally to each of you (which reports the gross sales price 50% to you & 50% to your mother); then it is up to each of you to report 50% of the transaction on your tax returns and to settle up the split of the proceeds between the two of you. That proceeds split will have nothing to do with the tax reporting.
Just when you do your taxes. However, if this was personal use property (verses a rental), any loss would be reportable, but not deductible. Any gain would both be reportable & subject to capital gains tax.
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