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's My 2023 Tax Bracket? Check out this handy reference of updated ranges from the IRS in case your designated bracket has changed. Roth 401(k) vs. Traditional 401(k) This calculator compares employee contributions to a Roth 401(k) and a traditional 401(k). Filing Final Tax Returns for the Deceased The federal government requires deceased individuals to file a final income tax return.