You will need to fill out Form SS-4, the application for employer identification number. Information on retirement plans for small businesses and the selfemployed.Choose a Plan, Maintain a Plan, Find or Fix Plan Errors, Plan Benefits. Whether you're a member, retiree or participating employer, Retirement Online gives you a convenient and secure way to do business with the Retirement System. Each tax year, you may be required to fill out Form 5500, depending on the type of plan you choose. This plan allows eligible employees to: Set aside money towards their retirement. Make Roth contributions that can grow tax-free. This website provides an entrance to numerous resources for starting, financing, expanding or relocating a business in Suffolk County, NY. Looking for a retirement plan or business investing account? Schwab offers a range of small business solutions to help you manage your finances.