If a taxpayer's pension or annuity includes contributions that were previously included in gross income, the taxpayer may generally:

If some contributions to your pension or annuity plan were prior combined in gross income, you can omit the part of the distributions from income. You must know the tax-free part when the payments start. The tax-free part normally stays the same each year, even if the amount of the payment changes. Nevertheless, the whole amount of your pension or annuity that you can omit from your income is typically defined by your total cost.