If you receive retirement benefits in the form of pension or annuity payments, the amounts you receive may be fully taxable, or partly taxable in the year received. Refer to Tax Topic 410, Pensions and Annuities, for detailed information, or Publication 575, Pension and Annuity Income. For social security and equivalent railroad retirement benefits, refer to Tax Topic 423 or Publication 915, Social Security and Equivalent Railroad Retirement Benefits.

References:

• Publication 575, Pension and Annuity Income
• Publication 915, Social Security and Equivalent Railroad Retirement Benefits
• Tax Topic 410, Pensions and Annuities
• Tax Topic 423, Social Security and Equivalent Railroad Retirement Benefits

Source: www.irs.gov