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 The Cost of Procrastination Don't let procrastination keep you from pursuing your financial dreams and goals. Understanding Equity Compensation Net Unrealized Appreciation and how it affects tax responsibilities. How Much Home Can I Afford? With a few simple inputs you can estimate how much of a mortgage you may be able to obtain.