Answer by
blahblah (670)
The main difference is that 403(b) plans can only be offered by certain types of employers, generally nonprofit and nonpolitical educational, religious, scientific, and charitable institutions. Employers themselves administer 401(k) plans; 403(b) plans are generally administered by other organizations. Because employers administer 401(e) plans, they often require employees to take their money out of the plan when they leave employment.