Married filing jointly is one of the more sexist things codified in US law. It basically says women make no money and the man has to provide for everyone with a big salary so deductions and credits for the big earner. Or it says that if you're a dual income bunch of shmucks, that your wife must make 80% of what you do.
Think about when these laws were written and look at it through a historical context. Once you do, it will outrage even the most even keeled.
Think about when these laws were written and look at it through a historical context. Once you do, it will outrage even the most even keeled.