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If you're both co-owners of the property and both are liable for the debt, the mortgage interest and property tax deduction can be split between the two of you. Providing that you both are legal owners of the property, you can split the mortgage deduction as you see fit. If the 1098 is not in both of your names, for the person whose name the 1098 is not in, can attach a statement to their tax return indicating the percentage of the mortgage interest and property tax deduction you are entitled to. Doing this is pretty common.
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