<prompt> Human: The IRS withholding calculator says well pay less tax by filing two separate Single status returns than filing one Married Filing Jointly return. I dont mean Married Filing Singly. I mean two returns with the Single status.Is it legal to be married and file two separate returns with the Single status?  <response>: No you cannot do that.This is referred to as the marriage tax which usually occurs when you make similar incomes. 