Self-Employed Retirement Plans Estimate the maximum contribution amount for a Self-Employed 401(k), SIMPLE IRA, or SEP. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content Please Leave Home Without It Concerns over identity theft continue to grow, especially with data breaches at major companies and financial institutions. Consider Keeping Your Life Insurance When You Retire Reasons to retain your coverage into your retirement years. What Is a Roth 401(k)? Roth 401(k) plans combine features of traditional 401(k) plans with those of a Roth IRA.