This guide is a snapshot of these benefits and is intended to assist you as you begin the transition to retirement. TSERS is a Defined Benefit Plan, which means retirement benefits are based on salary, years of service and a retirement factor.The formula for TSERS is:. The State offers low-fee, tax-deferred programs to provide a way to save money to supplement retirement income. To claim the credit you need to fill out IRS Form 8880 and attach it to your income tax return. You must also file your taxes using Form 1040, 1040A, or 1040NR. The NC Retirement System Plans are among the most well-funded public pension plans in the United States. Complete this form if you need to amend your North Carolina individual income tax return. You may be able to take a tax credit for making eligible contributions to your IRA or employersponsored retirement plan. Early Retirement (Reduced Benefits).