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 Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit. Understanding Equity Compensation Net Unrealized Appreciation and how it affects tax responsibilities. A Penny Saved is Two Pennies Earned Here are some simple and inexpensive energy-saving tips that may help you save money.