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 Question Thank you! Oops! Related Content How Big is Money? Learn a little about worldwide currency in this fun infographic Retiring Earlier Than Expected? What To Know Retiring earlier than expected can be disheartening. Learn steps that can help you smoothe the road ahead. Net Unrealized Appreciation (NUA) Explained Have you considered the special tax treatment on company stock held in a 401(k) plan?