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 How Income Taxes Work A quick look at how federal income taxes work. Why Do Renters Have to Save More? How much more would retirement cost if you owned your home rather than rented? It could actually be several times less. 5 Benefits of Working in Retirement Here are 5 reasons why you may consider working through retirement.