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 A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals. Silver Sneakers 101 Medicare’s popular program, offering free gym membership and health education. A Fruitful Retirement: Social Security Benefit Taking your Social Security benefits at the right time may help maximize your benefit.