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 Paying Off a Credit Card Enter various payment options and determine how long it may take to pay off a credit card. Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. Does Your Child Need to File an Income Tax Return? When your child has income, there’s a good chance that he or she will need to report it and pay taxes.