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 Exploring the Federal Student Grant Program In this article, explore the benefits of the Federal Student Grant Program. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. Building a Solid Financial Foundation Sustain financial well-being or create wealth through these actions.