I'm trying to compare health insurance plans. If one plan allows me to pay $X before taxes, and one costs me $Y after taxes, how much greater must X be than Y in order for them to cost me "the same" in real terms? Assume I'm neither dirt poor (and thus not paying taxes) or in the top 1% (where taxes get really weird).
We've had a couple questions on this before, but they seem really specific, and I'm looking for a general guideline to help me convert numbers while doing a detailed comparison now and in the future.