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. Related Content Capital Gains Tax When Selling Your Home If your clients are buying or selling a home, use this to help them determine if they qualify for capital gains taxes. Put It in a Letter A letter of instruction provides additional and more personal information regarding your estate. Insurance Needs Assessment: When You're Newly Married Marriage changes everything, including your insurance needs.