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 When Should You Take Social Security Monthly Social Security payments differ substantially depending on when you start receiving benefits. Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card. Impact of Taxes and Inflation Estimate the potential impact taxes and inflation can have on the purchasing power of an investment.