STRS stands for State Teachers’ Retirement System, a public pension program that provides retirement benefits to teachers and other public education employees. Several states use this exact acronym for their systems, with STRS Ohio and CalSTRS (California) being the most well-known. Other states call their version TRS (Teacher Retirement System) or use a different name entirely, but they all serve the same basic purpose: collecting contributions from educators and their employers during working years and paying out retirement income later.
How STRS Works
When you work as a public school teacher, a percentage of each paycheck is automatically deducted and sent to your state’s retirement system. Your employer (typically the school district) contributes a matching or similar percentage on top of that. These combined contributions fund the pension system, and professional investment managers invest the pooled money on behalf of all members.
Contribution rates vary by state. As one example, Arizona’s state retirement system requires employees and employers to each contribute roughly 12% of salary. Other states set their rates higher or lower, but the structure is similar: both you and your employer pay in throughout your career.
Most STRS programs also offer disability benefits if you become unable to work and survivor benefits that provide payments to your family if you die during your career. Some systems include access to retiree health care coverage, though that benefit is typically not guaranteed and can be changed or discontinued.
Plan Types Available to Members
Many state teacher retirement systems offer more than one plan structure. The options generally fall into three categories.
- Defined benefit plan: This is the traditional pension. Your monthly retirement payment is calculated using a formula based on your age, years of service, and salary history. The retirement system’s investment professionals manage the money, and your benefit amount doesn’t depend on how the stock market performs. This plan tends to reward career educators who spend decades in the system.
- Defined contribution plan: This works more like a 401(k). Your retirement income depends on how much was contributed to your individual account and how well the investments you selected performed over time. If you leave teaching before retirement, this plan typically offers more flexibility for withdrawing your money. It’s often a better fit for educators who don’t plan to make teaching a lifelong career.
- Combined plan: A hybrid that blends elements of both. Part of your retirement income comes from a defined benefit formula, and part comes from a defined contribution account where you choose the investments. This gives you some of the predictability of a pension along with some control over investment decisions.
Not every state offers all three options. In systems that do, new members typically choose a plan when they’re first hired and may have a limited window (often within the first few years of employment) to switch to a different plan if they change their mind.
STRS and Social Security
One of the most important things to understand about STRS is that in some states, public school teachers do not pay into Social Security. Instead, their STRS contributions replace Social Security entirely. About 28% of state and local government workers fall into this category. The remaining 72% pay into both Social Security and their state pension system.
For decades, two federal rules reduced or eliminated Social Security benefits for people who also received a pension from work not covered by Social Security. The Windfall Elimination Provision (WEP) reduced your own Social Security retirement benefit, and the Government Pension Offset (GPO) could reduce or wipe out spousal or survivor benefits you might otherwise receive through a spouse’s Social Security record. Together, these provisions affected over 2.8 million people.
The Social Security Fairness Act, signed into law on January 5, 2025, eliminated both WEP and GPO for benefits payable from January 2024 forward. This means if you receive an STRS pension from non-covered employment, your Social Security benefits (whether earned through other jobs or through a spouse) are no longer reduced because of that pension.
Who Participates in STRS
STRS membership typically includes classroom teachers, administrators, school counselors, librarians, and other certified staff employed by public school districts, community colleges, and sometimes public universities. Support staff like bus drivers or cafeteria workers may be covered under a different state retirement system rather than the teachers’ system.
Membership is generally mandatory. If you’re hired into a qualifying position, contributions begin automatically. You don’t opt in or out the way you might with an employer-sponsored 401(k) in the private sector.
How Retirement Benefits Are Calculated
Under a defined benefit plan, the most common STRS structure, your monthly pension is determined by a formula. While the exact formula varies by state, it typically multiplies three factors together: a benefit multiplier (a percentage set by the system, often around 2%), your years of credited service, and your final average salary (usually the average of your three to five highest-earning years).
For example, a teacher who worked 30 years with a final average salary of $70,000 and a 2% multiplier would receive 60% of that salary, or $42,000 per year, as a pension. Working longer or earning a higher salary increases the benefit. Some systems also set minimum retirement ages or require a combination of age plus years of service to qualify for full benefits.
If you leave teaching before you’re eligible for a pension, you can typically withdraw your own contributions (sometimes with interest), but you forfeit the employer-funded portion and the pension benefit itself. This is why the defined contribution or combined plan can be more attractive if you’re uncertain about staying in education long-term.
Size and Scale of Teacher Pension Systems
Teacher retirement systems are among the largest pension plans in the country. CalSTRS, the Teacher Retirement System of Texas, and the New York State Teachers’ Retirement System all rank among the top 10 U.S. pension plans by assets. These systems collectively manage hundreds of billions of dollars and serve millions of active, inactive, and retired members. The investment returns generated by these funds are a major source of the money used to pay retiree benefits, alongside ongoing employee and employer contributions.