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 Buying vs. Leasing a Car Whatever your relationship with your car, it may eventually come time for a new one. Familiarize yourself with your options. Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one. Money that Buys Good Health is Never Ill Spent It's important to make sure your retirement strategy anticipates health-care expenses.