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 What's My Potential Estate Tax? This calculator helps estimate your federal estate tax liability. The Junk Drawer Approach to Investing It's easy to let investments accumulate like old receipts in a junk drawer. A Look at Whole Life Insurance Whole life insurance remains in force as long as you remain current with premiums. Here's how it works.