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 Potential Income from an IRA Estimate your monthly and annual income from various IRA types. The Cycle of Investing Understanding the cycle of investing may help you avoid easy pitfalls. SECURE Act 2.0: An Overview The second iteration of the SECURE Act brings forward several changes to the world of retirement.