The calculation error that upended the state’s largest pension fund has been traced back to a single month in 2015, according to an investigation from Spotlight PA.
The discovery came to light in a trove of documents obtained by reporters that found a tiny discrepancy that boosted the $64 billion Public School Employees Retirement System (PSERS) by a third of a percentage point in April of that year.
The consultant firm hired to review PSERS’ investment returns between 2011 and 2020, ACA Compliance Group, performed limited checks that skipped over the month in question, according to the report. The company that crunched the actual numbers, Aon, blamed the discrepancy on a data entry error.
No matter the fault, the miscalculation unraveled PSERS’ rate of return, dropping it from just above the mandated 6.36% threshold to prevent a contribution increase down to 6.34%. Now, about 100,000 workers who joined the system in 2011 or later will pay more beginning on July 1.
Now The Inquirer and Spotlight PA have obtained new internal fund documents that shed light on that consequential mistake. The material traces the error to “data corruption” in just one month — April 2015 — over the near-decade-long period reviewed for the calculation.
The error was small. It falsely boosted the $64 billion PSERS fund’s performance by only about a third of a percentage point over a financial quarter. Even so, it was just enough to wrongly lift the fund’s financial returns over a key state-mandated hurdle used to gauge performance.
The documents reveal that a fund consultant, Aon, blamed the mistake on its clerical staff for inputting bad data. The material also shows that even though the fund hired a consultant, the ACA Compliance Group, to check the calculations, the consultant made only limited checks, and skipped over the month with the critical errors.
Author(s): Joseph N. DiStefano, Craig R. McCoy, Angela Couloumbis