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 Best-Performing Asset Classes Bonds may outperform stocks one year only to have stocks rebound the next. Comparing Mortgage Terms Estimate the total cost in today's dollars of various mortgage alternatives. How Much Home Can I Afford? With a few simple inputs you can estimate how much of a mortgage you may be able to obtain.