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 College This calculator can help you estimate how much you should be saving for college. Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one. How to Appeal Your Property Taxes For homeowners who think their property taxes are too high, there are ways to appeal.