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 Exploring Retirement Plans for Small Businesses Help small businesses make better retirement decisions for employees with this eye-catching and informative infographic. How Will Working Affect Social Security Benefits? Knowing the rules may help you decide when to start benefits. Should You Ever Retire? A growing number of Americans are pushing back the age at which they plan to retire. Or deciding not to retire at all.