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 Retirement Redefined Around the country, attitudes about retirement are shifting. Insurance Needs Assessment: When You're Newly Married Marriage changes everything, including your insurance needs. Put It in a Letter A letter of instruction provides additional and more personal information regarding your estate.