The Retirement Office is responsible for managing investments and retirement benefits for Allegheny County Employees' Retirement System (ACERS) Plan members. For calculating income, use only.Each tax year, you may be required to fill out Form 5500, depending on the type of plan you choose. Some forms of payments from pensions and individual retirement programs. (such as: Keogh, Tax Shelter Annuity, IRA and 401K) are not taxable. A business retirement plan can help you save for the future with tax breaks. Here are the top self-employed retirement plans and how they compare. Simplified Employee Pension — Individual Retirement Accounts Contribution Agreement. A Pennsylvania family with a working adult earns more income and greater benefits than a family without a working adult. See Instruction 17 in the tax booklet.