Good news! Received confirmation in writing that my 457(b) is governmental, which leads me to my next questions:
I only make about $40,000 gross, so I don't think it's possible for me to max out both the 457(b) and 403(b) after health insurance, state and local taxes, etc. Ideally, I want to get my take-home pay down to $0 by putting money into tax deferred accounts. This should get our joint taxable income down to the 15% bracket, so then it will make sense to max out Roth IRAs.
Can I make my federal withholding $0? Does the withholding automatically decrease as my paycheck taxable income decreases, or do I have to talk to someone in payroll? I think I should be able to put more than my current net pay into tax deferred accounts, but the form I have to submit says I'm responsible for the amount. I don't want to "overdraft" my paycheck.
Also, when do you pay FICA taxes on 403(b) and 457(b) contributions?