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 Message Thank you! Oops! Related Content Understanding Equity Compensation Net Unrealized Appreciation and how it affects tax responsibilities. The Lowdown on Those Free Credit Scores What’s the deal with your yearly free credit report? What Is My Current Net Worth? Use this calculator to estimate your net worth by adding up your assets and subtracting your liabilities.