First, dates and ages are calculated pursuant to the social security law and regulations.

• Date of birth is the actual date of birth as entered.

• SS date of birth is the day preceding the actual date of birth. This date is described as a month and year, eg., Dec. 1969. See CFR 404.2(c)(4).

• SS year of birth follows directly from the SS Date of birth.

• Full retirement age is determined from the SS year of birth. In general, it is age 65 for SS year of birth prior to 1938, grading up to age 67 for SS year of birth after 1959. See Soc. Sec. Act §216(l)(1).

• Full retirement date is the month and year in which full retirement age is attained. It is determined by adding the full retirement age to the SS date of birth. Note that benefits are generally paid in the month following the effective month. This is the Social Security Normal Retirement Date that is calculated by ProAdmin: the first date you can receive an unreduced PIA.

• The number of months between the commencement age and full retirement age will determine the amount of any reduction or credit.

Next the steps of the calculation are shown, including all intermediate rounding. These steps include the development of the AIME, PIA, and any adjustments such as CPI, reductions, or (delayed retirement) credits. For more detail, see the Technical Reference article on PIA calculations (U.S. social security).