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 How to Read Your Credit Report Solve a mystery while learning how important your credit report is with this story-driven interactive. Why Regular Rebalancing Makes Sense Without your knowing, your investment portfolio could be off-kilter. Choosing a Retirement Plan that Fits Your Business To choose a plan, it’s important to ask yourself four key questions.