How the CalSTRS Benefit Formula Works

The three-part formula

The CalSTRS Defined Benefit formula is service credit multiplied by age factor multiplied by final compensation. With 25 years, a 2.0 percent age factor and $80,000 final compensation, the illustrative Member-Only Benefit is $40,000 annually.

This simple example does not include an option reduction, unused sick leave, career factor, longevity bonus or other member-specific adjustment.

Age can change more than one input

Waiting to retire can add service credit and increase the age factor. A later year may also move a different compensation period into the final average. For that reason, compare complete estimates rather than changing only one factor by hand.

Use official records

CalSTRS maintains the authoritative service and compensation history. Review the Retirement Progress Report, correct missing service early and use the official calculator for the retirement date being considered.

Calculate each factor separately

The Member-Only Benefit is built from service credit × age factor × final compensation. Treat each input as a separate record. Service credit comes from covered work and eligible additions; age factor comes from the structure and exact retirement age; final compensation comes from a defined period of compensation earnable.

A 28-year member with a 2.1 percent age factor and $92,000 final compensation has an illustrative annual benefit of $54,096, or $4,508 per month, before an option reduction and other adjustments. The same service and salary at a 1.8 percent factor would produce $46,368 annually.

Service credit may include more than worked years

Part-time service produces a fraction based on the assignment and compensation rules. Purchased service, unused sick leave and certain other adjustments can be added under separate provisions. The annual statement is more reliable than counting school calendars.

Unused sick leave generally increases the benefit calculation after retirement but cannot replace earned service needed for minimum retirement eligibility. Keep earned and additional credit separate when evaluating an earliest retirement date.

Final compensation is not simply final salary

CalSTRS uses compensation earnable and creditable compensation rules over an applicable 12- or 36-month period. Salary increases, extra-duty assignments and reduced workloads near retirement can affect the average differently from what a final pay stub suggests.

Ask the employer how each pay item is reported and compare it with the Retirement Progress Report. Correct missing compensation or service before filing, because a calculator cannot identify an employer-reporting error.

Member-Only versus option benefits

The basic formula produces the Member-Only Benefit. Choosing an option to provide a lifetime benefit to another person generally reduces the member payment. The reduction depends on the option and actuarial factors, including ages.

Request option estimates for the same retirement date so the household can compare member income and survivor income in dollars. Do not apply a generic percentage from another member's election.