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 Roth IRA for Kids Learn about the benefits and requirements of opening a Roth IRA for kids. Behavioral Finance An amusing and whimsical look at behavioral finance best practices for investors. SECURE Act 2.0: An Overview The second iteration of the SECURE Act brings forward several changes to the world of retirement.