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 Tuning Your Social Security Benefit When should you take your Social Security benefit? Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns. What's So Great About a Rollover? Making a career move requires tough decisions, not the least of which is what to do with the funds in your retirement plan.