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 Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government. A Fruitful Retirement: Social Security Benefit Taking your Social Security benefits at the right time may help maximize your benefit. What’s My 2024 Tax Bracket? Check out this handy reference of updated ranges from the IRS in case your designated bracket has changed.