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 Saving for Retirement This calculator can help you estimate how much you may need to save for retirement. Saving for College This calculator can help you estimate how much you should be saving for college. Impact of Taxes and Inflation Estimate the potential impact taxes and inflation can have on the purchasing power of an investment.