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 Question Thank you! Oops! Related Content Saving for Retirement This calculator can help you estimate how much you may need to save for retirement. Historical Inflation This calculator shows how inflation over the years has impacted purchasing power. Bi-Weekly Payments This calculator estimates the savings from paying a mortgage bi-weekly instead of monthly.