401(k) plans can be a powerful tool to promote financial security in retirement. Looking for a retirement plan or business investing account?Schwab offers a range of small business solutions to help you manage your finances. Explore your options and find a tax-advantaged small business plan as a self-employed professional, entrepreneur, or business owner. The solo 401(k) is a retirement savings option for small businesses whose only eligible participants in the plan are the business owners. A SIMPLE IRA plan provides you and your employees with an easy way to contribute toward retirement. You must use a special rule to calculate retirement plan contributions for yourself. 2.Your business cannot currently have another retirement plan. If you are among the thousands of business owners eligible for a SIMPLE IRA plan, read on. No annual filing requirements for employer.