if you have a 20 percent marginal tax rate and health insurance costs you $5,000 per year, how much will you save in taxes if you can buy the insurance through a pretax plan at your employer? if you have a 20 percent marginal tax rate and health insurance costs you $5,000 per year, how much will you save in taxes if you can buy the insurance through a pretax plan at your employer? $1,000 $1,250 $2,500 $4,000