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 Saving for College This calculator can help you estimate how much you should be saving for college. Bull & Bear Markets: A Timeline This helpful infographic will define bull and bear markets, as well as give a historical overview. SECURE Act 2.0: An Overview The second iteration of the SECURE Act brings forward several changes to the world of retirement.