A solo 401(k) is an individual 401(k) designed for the selfemployed and for business owners with no fulltime employees. IRAs. plans (also known as IRAs) are Simplified Employee Pension plans.Set up a SIMPLE IRA plan at any time January 1 through October 1. Explore your options and find a tax-advantaged small business plan as a self-employed professional, entrepreneur, or business owner. Clark University Retirement Plan ("Plan") has been adopted to provide you with the opportunity to save for retirement on a tax advantaged. Company Contribution Plan. Learn more about retirement options as an entrepreneur, ways to create additional retirement income and how to plan accordingly. Each tax year, you may be required to fill out Form 5500, depending on the type of plan you choose. Looking for a retirement plan or business investing account? Schwab offers a range of small business solutions to help you manage your finances.