The annual contributions from the state, local school districts and community colleges to CalSTRS, about $3.5 billion for the upcoming fiscal year, would need to be raised by an additional $4 billion in 2011, the fund estimates.
Waiting just five years to raise the contribution level would boost that annual increase to $6 billion, and waiting 10 years would increase the amount to $8 billion, CalSTRS said.
The increases are necessary because CalSTRS' actuaries say the fund would need a return on investments of more than 20% a year over the next five years to make up for recent recessionary losses. Over the last 30 years, CalSTRS' portfolio has increased an average of 8.65% a year.
In an attempt to be more conservative, the board now is considering reducing its assumed annual return to as low as 7.5%. CalPERS also is considering lowering its 7.75% benchmark.