Perhaps I'll make a brief response, and then I will have to leave.
I think, as Professor Lahey said, it would be extremely revealing. If we had a gender breakdown of how the tax system impacts men and women, it would reveal some inequities that would immediately seem very intolerable, which are currently deeply hidden in the tax system.
By bringing those to light, without even making a specific policy recommendation, it would be a tremendous service and an improvement in our budget process.