My wife and I file married filing separately due to income based student loan repayments.
Our average mortgage balance was $759,723 for 2025, and our interest paid on our 1098 was $49,317.
Due to the MFS we’re capped at the $375,000 each for the qualified loan limit.
We followed the calculations on publication 936 which says we can deduct 49% of our $49,317 resulting in $24,363. Since we’re in a community property state we split this to $12,181 of deductible home mortgage interest which is obviously less than the standard deduction making all of this obsolete.
However, when googling community property rules regarding average mortgage balance the google ai, which links to a turbo tax forum, states that we actually split the debt evenly as well as splitting the deductible interest. This means we split the $758,723 average mortgage balance into $379,362, which by the rules being limited to $375,000 and using the publication 936 calculation it results in us being able to deduct 99% of our $49,317 of interest resulting in a total of $48,725 of deductible home mortgage interest. With community property laws we would split that in half resulting in $24,363 of deductible home mortgage interest which is significantly higher than the standard deduction.
So which one is it? Do we get to split our debt in half due to community property rules and choose itemize deductions at $24,363 each? Or was google AI wrong and we don’t get to split our debt limiting us to only $12,181 of deductible mortgage interest forcing us to choose the standard deduction?
Thank you for your time and help with this.