With no retirement savings at all (terrible idea, by the way), something between $76k and $77k nets exactly $4200/month in California, after taxes, social security, etc. (According to PaycheckCity.com)
If you put back 10% into a 401(k), you need $88k minimum to net $4200/month.
If you put back 10% into a 401(k), you need $88k minimum to net $4200/month.