Not enough information for an accurate answer. What is the interest rate on the mortgage? How much are the annual taxes on the property? Those will influence the calculations, so we'll have to proceed with some guesstimates. At 5.5%, the monthly interest payments will start out at $1,237.50 and will average about $1,230 per month for the first 12 months for a total of about $14,760 for the first year. Assuming an equal share, you'll each get half of that for the mortgage interest rate deduction, or $7,380 each.
Your payment doesn't appear to include taxes, insurance or HoA fees though. Only taxes are deductible and those vary wildly across the nation. In CA they'd be about 1% of the purchase price or $3,388 but in TX they'd be closer to $17,000 in most major cities. You'd each deduct half of the taxes, so for sake of an example we'll go mid-range at $7,000 per year or $3,500 each.
With these numbers, each will get an itemized deduction of $10,880. Assuming no other itemized deductions for either, the benefit is a deduction of $5,430 ($10,880 - $5,450 Standard Deduction). The one earning $36,000 is in a 15% tax bracket so their tax savings would be $815. The one earning $50,000 is in a 25% bracket so their tax savings would be $1,358.