The threshold rates for a lot of credits, deductions and exemptions are not. Like the Roth IRA is $153k for single, $242k for married. Child care credits have a similar problem if I remember correctly (or they did before my kids grew out of it).
Portland, OR metro gives a $125k threshold to single and only $200k to married filing jointly for supportive housing taxes, which is a 1% tax on income above the threshold.
I have no idea why households that tend to demand less housing (married usually live together) are charged more than singles, who typically demand their own housing at that income level. It makes no sense!
Plus states and counties do it too.
Portland, OR metro gives a $125k threshold to single and only $200k to married filing jointly for supportive housing taxes, which is a 1% tax on income above the threshold.
I have no idea why households that tend to demand less housing (married usually live together) are charged more than singles, who typically demand their own housing at that income level. It makes no sense!