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 IRA Withdrawals that Escape the 10% Tax Penalty The list of IRA withdrawals that may be taken without incurring a 10% early penalty has grown. Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. Once Upon a Goal Do you know how to set up your financial goals for success? This knight does.