Get your taxes done using TurboTax
As @ColeenD3 stated above, "split everything 50/50."
Each of you can report "one-half" the sale of the house - 1/2 of the proceeds, 1/2 of the selling costs, 1/2 of the cost basis.
The same goes for the mortgage interest - each of you can enter 1/2 of the amounts reported on the Form 1098.
Enter "sale of home" in the Search box and select "jump to sale of home" from the results. See the screenshot below for aid in navigation:
