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 Social Security Taxes Estimate how much of your Social Security benefit may be considered taxable. Social Security Benefits: How Much Will I Receive Calculating your potential Social Security benefit is a three-step process. Insurance Needs Assessment: For Empty Nesters and Retirees Do your insurance needs stay the same when the nest empties?