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 Inflation and the Real Rate of Return Learn about the role of inflation when considering your portfolio’s rate of return with this helpful article. A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals. Social Security: Maximizing Benefits There are other ways to maximize Social Security benefits, in addition to waiting to claim them.