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 Tax Efficiency in Retirement What role would taxes play in your investment decisions? Asset Allocation Consider how your assets are allocated and if that allocation is consistent with your time frame and risk tolerance. Contributing to an IRA? Determine if you are eligible to contribute to a traditional or Roth IRA.