CalSTRS is the largest teacher pension fund in the United States, covering roughly 950,000 active and retired California educators. The formula, the tier you're in, and the DB Supplement account all affect your final retirement income. Here's what you need to know.
The CalSTRS benefit formula
Your CalSTRS defined benefit is: age factor x years of service credit x final compensation.
The age factor is the percentage per year of service that you earn, and it varies by your tier and your age at retirement. For most members, it ranges from 2.0% to 2.4%.
Final compensation is the average of your highest-paid 12 consecutive months for Tier 1 members, or the highest 36 consecutive months for members under CalSTRS 2% at 62 (Tier 2).
Tier 1 vs. CalSTRS 2% at 62
If you were hired before January 1, 2013, you're in Tier 1. Your standard age factor is 2.0% at age 60, stepping up to 2.4% if you retire at age 63 or later with at least 20 years of service. You can retire as early as age 55 with 5 years of service, but with a reduced factor.
If you were hired on or after January 1, 2013, you're under the CalSTRS 2% at 62 formula (part of the Public Employees' Pension Reform Act, known as PEPRA). Your standard age factor is 2.0% at age 62. The maximum factor of 2.4% applies if you retire at age 65 with at least 30 years of service. Your final compensation is calculated using a 3-year average rather than 1 year. Early retirement begins at age 55, with reduced factors.
The 2013 reform reduced benefits for new hires in exchange for more sustainable plan funding. If you were grandfathered into Tier 1 and retire at 63 with 30 years, your multiplier is the same as a new hire at 65 with 30 years. The practical difference is mostly in the final compensation averaging period and the retirement age for full benefits.
The Defined Benefit Supplement
CalSTRS has a second component called the Defined Benefit Supplement, or DB Supplement. It's a separate account, not a separate pension.
The DB Supplement is funded by member contributions above the normal DB contribution level plus a share of excess investment earnings credited by CalSTRS in strong market years. Your DB Supplement balance grows in your account over your career.
At retirement, you can take the DB Supplement balance as additional monthly income added to your main pension, as a partial lump sum, or as a combination of both. Unlike the main CalSTRS pension, the DB Supplement balance is yours in a more direct sense: if you die before exhausting it, remaining funds can pass to beneficiaries.
Log into your myCalSTRS account to see your current DB Supplement balance. For most career teachers, it's a meaningful amount, often $30,000 to $100,000 or more.
No Social Security for most California teachers
Most California public school teachers don't pay into Social Security and don't earn SS credits from their teaching work. If you worked in Social Security-covered employment before or after teaching, those benefits were previously subject to the Windfall Elimination Provision (WEP) and the Government Pension Offset (GPO).
Both the WEP and GPO were fully repealed effective January 5, 2025 under the Social Security Fairness Act. If either provision previously reduced your Social Security benefit, you should now receive your full earned amount plus retroactive payments back to January 2024. Use the WEP calculator to estimate how much you're owed.
CalSTRS funding status
CalSTRS had a funded ratio of approximately 72% as of 2025. That sounds low, and it is below the 80% threshold most plan analysts consider healthy. But California law guarantees accrued pension benefits. They cannot be reduced retroactively, even if the fund is underfunded.
Since the 2014 funding reform, the state, school districts, and members have all increased their contribution rates significantly. CalSTRS is on a statutory funding path that projects full funding by 2046. Benefits for current and future retirees are protected by state constitutional and statutory guarantees.
How to estimate your CalSTRS benefit
The most accurate way is to log into your myCalSTRS account at mycalstrs.com. The site has a benefit estimate calculator that uses your actual service credit, compensation history, and DB Supplement balance. It lets you model different retirement ages and final compensation scenarios.
As a quick estimate: multiply your age factor (2.0% to 2.4%) by your years of service by your final compensation. A Tier 1 teacher retiring at 63 with 32 years of service and a $85,000 final compensation earns: 0.024 x 32 x $85,000 = $65,280/year, or $5,440/month before any survivor benefit election.
Full plan details and state-specific information at the California state pension page. For private-sector pension lump sum math, use the main PensionMath calculator.
CalSTRS plan structure: three components
CalSTRS is not a single pension -- it is a system with three distinct components. The Defined Benefit (DB) program is the core retirement benefit, providing a lifetime monthly pension based on age, service credit, and final compensation. The Defined Benefit Supplement (DBS) is a separate account funded by contributions from both the member and employer, which provides a lump sum supplement at retirement or a conversion to additional monthly income. The Cash Balance (CB) Benefit Program serves part-time, seasonal, and substitute educators who do not qualify for the full DB program, providing a defined contribution-style account that can be distributed at separation or converted to an annuity.
Most full-time K-12 teachers, community college instructors, and other public school employees in California who work at least half-time are in the CalSTRS Defined Benefit program. Part-time employees who do not meet the minimum service threshold may be in the Cash Balance program instead. Understanding which component you are in determines both the benefit formula and the available distribution options at retirement.
CalSTRS and Social Security: the critical difference
Most CalSTRS DB members do not participate in Social Security through their CalSTRS-covered employment. California school districts are generally not required to participate in Social Security, and most do not. This means CalSTRS members who spent their careers exclusively in California K-12 education have no Social Security earning credits from that work -- their retirement income is exclusively the CalSTRS pension, any DBS supplement, and any Social Security credits from other jobs outside CalSTRS-covered employment.
This is fundamentally different from private-sector pension participants, who typically have both a pension and Social Security. For CalSTRS members without Social Security from outside employment, the monthly CalSTRS benefit is their primary -- and often only -- retirement income source. The absence of Social Security means there is no COLA-adjusted income stream to offset the fixed CalSTRS pension's purchasing power erosion over time. CalSTRS provides a 2% simple interest cost-of-living supplement (the purchasing power protection, or PPP benefit) but this is not a full COLA -- it is a partial offset with a floor and a ceiling that limits its effectiveness in high-inflation periods.
CalSTRS members who also worked in Social Security-covered employment (private sector, federal government, or Social Security-participating public employers) may have Social Security benefits. Those members were previously subject to the Windfall Elimination Provision (WEP), which reduced Social Security benefits for individuals who also received a pension from non-covered employment. The Social Security Fairness Act, signed January 5, 2025, repealed WEP entirely. CalSTRS members with outside Social Security credits now receive their full earned benefit without any WEP reduction.
CalSTRS benefit formula: the 2% at 60 vs 2% at 62 distinction
CalSTRS uses two different benefit factor schedules depending on when the member was first hired into CalSTRS-covered employment. Members hired before January 1, 2013 are in the "2% at 60" benefit structure (CalSTRS 2% at 60), where the age factor reaches its maximum of 2.4% at age 63. Members first hired on or after January 1, 2013 are in the "2% at 62" structure (CalSTRS 2% at 62, also called the PEPRA benefit), where the maximum factor of 2.4% is reached at age 65.
The practical difference: a member in the 2% at 60 structure who retires at 60 with 30 years of service receives 2.0% x 30 = 60% of final compensation. The same member at 63 receives 2.4% x 30 = 72% of final compensation -- a 20% increase in the monthly benefit from three additional years of delay, holding service constant. Under the 2% at 62 structure, the member must wait until 65 to reach the 2.4% factor. Earlier retirement under either structure results in a lower age factor and therefore a lower monthly benefit, even for the same years of service.
CalSTRS survivor and beneficiary options
CalSTRS offers several payment options that determine what happens to the pension benefit after the member's death. The Member-Only benefit is the highest monthly payment and terminates at the member's death -- no survivor benefit. Option 1 (Reversionary Annuity) provides a reduced benefit while the member is alive, with the full Member-Only benefit partially restored if the beneficiary predeceases the member. Option 2 (100% Beneficiary) provides a reduced member benefit with 100% of that reduced amount continuing to the named beneficiary after death. Option 3 (50% Beneficiary) provides a smaller reduction from Member-Only with 50% of the reduced benefit continuing to the beneficiary. Option 4 (Lump Sum Option) provides a one-time payment to the beneficiary in lieu of a continuing annuity.
Unlike private-sector ERISA plans, CalSTRS does not require a spouse to consent to the Member-Only election. However, if the member is married, the spouse has community property rights in the pension accrued during the marriage. Divorcing CalSTRS members should understand how the Joinder of CalSTRS in the dissolution proceeding affects the benefit before making any retirement election.
CalSTRS inflation protection: the Purchasing Power Protection
CalSTRS provides a purchasing power protection (PPP) benefit designed to prevent benefits from falling below 85% of their original purchasing power. The PPP is paid as an additional monthly benefit when the cumulative CPI erosion would cause the pension to fall below the 85% threshold. In practice, the PPP is a partial offset: it maintains benefits at 85% of original purchasing power but does not provide a full COLA. CalSTRS members who retire in their early 60s and live 25 to 30 years can experience meaningful purchasing power erosion in the final decade of retirement even with the PPP benefit in place.
This inflation risk reinforces the importance of non-CalSTRS savings -- 403(b) accounts, IRAs, and other investments -- as a supplemental income source for CalSTRS retirees. The CalSTRS 403(b) program (available through county offices of education and school districts) allows members to save additional pre-tax dollars alongside the CalSTRS pension. Members who maximize 403(b) contributions during their working years have a flexible supplemental income source in retirement that can fill the gap as the fixed pension's purchasing power erodes.
Applying the PensionMath calculator to CalSTRS
The PensionMath calculator at the present value calculator is designed primarily for private-sector defined benefit pensions where a lump sum alternative is offered. CalSTRS does not offer a lump sum alternative to the lifetime annuity for DB members (though the DBS account is paid as a lump sum supplement). However, the calculator's present value function is useful for CalSTRS members who want to understand the lifetime value of their pension.
Enter your projected monthly CalSTRS benefit, your age at retirement, and a 4% discount rate to see the present value of the pension. This is the amount a private insurer would charge to provide an equivalent annuity -- it gives you a benchmark for comparing the CalSTRS pension's value against the cost of purchasing equivalent income in the private market. For a CalSTRS member retiring at 60 with $5,440/month in projected benefit (from the earlier example), the present value over a 27-year expected retirement horizon is approximately $1,000,000 to $1,100,000 at a 4% discount rate.
CalSTRS retirement planning: the 403(b) supplement
Because CalSTRS does not provide Social Security for most members and the purchasing power protection is only a partial COLA, the CalSTRS 403(b) Savings Plan is an essential supplement. The 403(b) allows CalSTRS members to contribute pre-tax dollars (up to $24,500 in 2026, or $32,000 with the age 50+ catch-up contribution) to a tax-deferred investment account. CalSTRS administers a voluntary 403(b) program through county offices of education that offers competitive investment options, including low-cost index funds and target-date funds.
CalSTRS members who maximize 403(b) contributions over a 30-year career accumulate a substantial supplemental retirement account. A teacher who contributes $10,000/year from age 35 to 65 in a 403(b) earning 6% annually accumulates approximately $790,000 at retirement. That balance, drawn down at 4% annually, provides approximately $31,600/year in supplemental income -- roughly $2,633/month -- in addition to the CalSTRS defined benefit. Combined with a $5,440/month CalSTRS pension, the total income is approximately $8,073/month, with the 403(b) portion providing the inflation protection and liquidity that the fixed pension cannot.
CalSTRS Defined Benefit Supplement: the DBS account
The CalSTRS Defined Benefit Supplement (DBS) is a separate account funded by contributions from both the member (2% of annual compensation) and the employer. The DBS balance grows with contributions and credited earnings, similar to a cash balance plan. At retirement, the DBS can be taken as a lump sum (in addition to the monthly DB benefit), converted to an additional monthly annuity, or left in the account to continue earning credits.
For a teacher earning $80,000/year over 30 years of CalSTRS membership, the DBS account accumulates contributions of approximately 4% of compensation per year (2% member + 2% employer) plus credited earnings. At a modest 4% credited return, the DBS account after 30 years holds approximately $135,000 to $160,000. This lump sum, paid at retirement alongside the monthly DB benefit, provides the CalSTRS member with a liquid asset -- one of the few lump sum sources available in a CalSTRS retirement since the DB benefit itself is not available as a lump sum.
CalSTRS and service credit: purchasing additional years
CalSTRS members can purchase additional service credit in certain circumstances, which directly increases the monthly benefit by adding to the years of service in the benefit formula. Permissive service credit purchases include out-of-state teaching service, substitute teaching service below the creditable threshold, and certain other public employment. The cost of purchasing additional service credit is based on the actuarial cost to the plan -- it is not a subsidized purchase.
Whether purchasing service credit is financially beneficial depends on the cost relative to the increase in monthly benefit. A member who can purchase 1 additional year of service credit for $15,000 and increase their monthly benefit by $200/month ($2,400/year) breaks even in approximately 6.25 years. If the member's expected retirement horizon is 25 years, the purchase generates approximately $60,000 in additional lifetime benefit (25 years x $2,400/year) at a cost of $15,000 -- a strong financial return. CalSTRS provides present value estimates for service credit purchase decisions through the myCalSTRS portal.
CalSTRS and disability retirement: what happens before 50
CalSTRS members who become disabled before reaching retirement age may qualify for disability benefits through CalSTRS. The disability benefit is based on a formula that differs from the standard service retirement formula -- it provides 50% of final compensation for the first 5 years, then transitions to the standard service retirement benefit calculated with the member's actual service credit. Disability retirement is available regardless of age for members who meet the medical criteria and service requirements.
CalSTRS disability retirement is distinct from Social Security Disability Insurance (SSDI). Most CalSTRS members who are not covered by Social Security through CalSTRS-covered employment would need separate Social Security disability coverage from outside employment to access SSDI. CalSTRS members who have worked in Social Security-covered jobs in addition to their teaching career may have SSDI coverage from that outside employment, but before January 2025, the WEP reduction applied to SSDI benefits received alongside a non-covered pension. With WEP repealed, this reduction no longer applies.
Retiring from CalSTRS: the service retirement process
To retire from CalSTRS, members file a retirement application through the myCalSTRS portal (my.calstrs.com) typically 30 to 90 days before the desired retirement date. The application requires selecting the payment option (Member-Only, Option 1 through 4), designating a beneficiary, and confirming banking information for direct deposit. CalSTRS processes the application and issues the first benefit payment approximately 60 days after the retirement date, so maintaining a cash reserve to cover the income gap during processing is important.
Before filing, verify the projected benefit amount in myCalSTRS matches the calculator output from the benefit formula. If you are within 5 years of your target retirement date, request an Official Benefit Estimate from CalSTRS -- this is the formal projected benefit amount used for retirement planning and is more accurate than the online estimate for members with complex service histories (part-time service, out-of-state credit, multiple employers). Use the PensionMath calculator at the present value calculator and the California state pension page at /state/california for further context on CalSTRS benefit planning.
CalSTRS vs. CalPERS: what K-12 and state employees need to know
CalSTRS covers educators in California's K-12 public school system and community colleges. CalPERS covers most other California state and local government employees, including state agency staff, university employees, and many city and county workers. The two systems are separate -- a career that spans both CalSTRS-covered employment and CalPERS-covered employment generates separate benefit accruals in each system.
Educators who transition from K-12 teaching to a CalPERS-covered state job (or vice versa) may have service credit in both systems. CalSTRS and CalPERS do not coordinate benefit calculations -- each system independently calculates the benefit based on the service credit accrued under its own formula. A former teacher who then worked as a state administrator for 10 years has both a CalSTRS benefit (from teaching) and a CalPERS benefit (from state employment). Both are lifetime annuities with survivor benefit options, and both should be included in the total retirement income picture.
CalSTRS retiree health: the STRS Health Program
CalSTRS administers a voluntary health benefits program for retired members: the STRS Health Program. The program provides access to medical, dental, and vision coverage for CalSTRS retirees and their eligible dependents. Premiums and plan options vary by county and region. Retired members who are Medicare-eligible pay lower premiums, since Medicare becomes the primary payer for most medical services at 65.
CalSTRS retirees who are not covered by Social Security cannot delay Medicare enrollment the way some private-sector retirees do -- there is no current employer coverage to establish a Special Enrollment Period. CalSTRS members should enroll in Medicare Part A and Part B at age 65 regardless of other coverage status. Medicare coordinates with the STRS Health Program as the secondary payer, reducing the net out-of-pocket cost for covered services. The California state pension page at /state/california provides additional context on CalSTRS and CalPERS retirement structures for California public employees.
CalSTRS retirement planning: a summary for California educators
California teachers and community college educators in the CalSTRS DB program have one of the strongest defined benefit pension systems for public employees in the United States. The benefit formula is generous, the purchasing power protection provides partial inflation coverage, and the STRS Health Program provides retiree health access. But the absence of Social Security for most members creates a structural gap: there is no COLA-adjusted income source to fully offset the fixed pension's long-run purchasing power erosion.
The strategic response to this gap is the 403(b) contribution over the working career, maximized early and consistently. A teacher who contributes aggressively to the CalSTRS 403(b) through their 30s and 40s builds a supplemental account large enough to provide real, flexible income in the back half of retirement when the fixed pension's purchasing power has eroded most significantly. Members who also have Social Security from outside CalSTRS-covered employment should include that benefit in their retirement income plan at its full amount. WEP was repealed effective January 5, 2025, so no reduction applies. Deferring the Social Security claim to 70 maximizes the COLA-adjusted benefit.
The CalSTRS benefit formula rewards staying in the profession. The age factor increases significantly from age 55 to 63 under the 2% at 60 schedule, and each additional year of service credit adds directly to the monthly benefit. A teacher who retires at 63 with 35 years of service earns approximately 20% more per month than the same teacher retiring at 60 with 32 years -- the combination of age factor improvement and three additional service years compounds into a materially higher lifetime benefit. For CalSTRS members who are within 5 years of retirement, the most valuable use of time is modeling the benefit at each possible retirement age from 60 to 65, comparing the lifetime present value at each age, and identifying the point where the annual benefit increase from working one more year no longer justifies the income foregone by not retiring. The myCalSTRS retirement estimate tool and the PensionMath calculator at the present value calculator together provide that analysis. Most CalSTRS members find that the optimal retirement age from a pure present value standpoint falls between 62 and 65 under the 2% at 60 schedule -- early enough to collect a long income stream, late enough to capture the maximum age factor. The analysis is worth running at each age before the retirement date is set. CalSTRS retirement is a permanent decision. The benefit formula rewards patience; the analysis confirms when patience stops paying off.