You are currently making $70,000 a year after taxes and are interested in maintaining your current income. If you are expecting $2,500 a month from Social Security, how much will you need to withdraw from your retirement accounts monthly?
so you want to have 70000/12
or $5833.33 per month.
Your social security gives you 2500 of that, so you need an extra $3,333.33 from your account