Your retirement is NOT taxable for PA income tax if you retired AFTER meeting the eligibility requirements for separation from service by retirement based on old age, infirmity, long-continued service, or a combination of old age and infirmity and long continued years of service.
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If these are just regular, nonqualified annuities that you purchased from an insurance company, the distributions are taxable.
If you invested in a retirement annuity that is not part of an employer-sponsored program or a commonly recognized retirement program, you do have PA taxable income when you begin receiving annuity payments.