How Do I Calculate My Final Average Salary (FAS)?

If you are a Tier I member, add your highest consecutive 26 pay periods and divide the total by 12 to get your monthly FAS.  

If you are a Tier II, III or IV member, add your highest consecutive 78 pay periods and divide the total by 36 to get your monthly FAS.  

Please keep in mind that not all of your earnings may be pensionable and thus should not be included in your FAS calculations.  Overtime is such an example where overtime pay is not to be included in your FAS calculation for pension purposes.