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. Related Content How to Conquer the World - 5 Financial Strategies for Savvy Learn more about women taking control of their finances with this infographic. How Income Taxes Work A quick look at how federal income taxes work. Saving for Retirement This calculator can help you estimate how much you may need to save for retirement.