As long as you were both legally liable, such as both names on the mortgage, you can split the home deductions in any manner agreed upon as long as not more than 100% of the interest and taxes are deducted between both returns. For example, you can deduct 50% on your return, and he can deduct 50% on his return. But, you cannot deduct 100% while he deducts 50%.
Keep in mind, real estate taxes and mortgage interest are itemized deductions. You would only itemize if your total deductions are greater than the standard deduction for your filing status. In 2019, if your filing status is single, your standard deduction is $12,200.
Itemized deductions include medical expenses in excess of 7.5% of AGI, mortgage interest, state and local taxes including real estate and personal property taxes (capped at $10,000), and charitable contributions.
Splitting these deductions may result in a reduced ability to itemize. You may have to separately determine the most favorable outcome for both of you.
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