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 What Is My Current Net Worth? Use this calculator to estimate your net worth by adding up your assets and subtracting your liabilities. How Insurance Deductibles Work Knowing how insurance deductibles work can help you save money. Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process.