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 Capital Gains Tax Estimator Use this calculator to estimate your capital gains tax. Preparing for the Expected You can plan ahead to protect yourself and your family against the financial consequences of deteriorating health. The Latte Lie and Other Myths Check out this video to begin separating fact from fiction.