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 Disability and Your Finances In the event of an unforeseen accident or illness, disability insurance may be a good way to protect your income and savings. Choosing a Retirement Plan that Fits Your Business To choose a plan, it’s important to ask yourself four key questions. A Brief History of Estate Taxes Federal estate taxes have long since been a lucrative source of funding for the federal government.