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 A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals. Insurance Needs Assessment: When You're Young and Single Even if you’re young and single, you should still consider protecting yourself. What Do Your Taxes Pay For? Here's a breakdown of how the federal government spends your tax money.