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. Related Content Retirement Traps to Avoid Beware of these traps that could upend your retirement. Perception vs. Reality There’s an alarming difference between perception and reality for current and future retirees. And the Executor Is The right executor may help ensure the distribution of your assets is done with as little upheaval as possible.