Bottom line
A service purchase can change eligibility, benefit size, or both—but each service type has separate limits and documentation rules.Key facts
- TRS recognizes several service-purchase categories
- Not every purchase can establish retirement eligibility
- Cost and deadline vary by service type
Service credit is not one product
TRS publishes separate rules for withdrawn service, unreported service, out-of-state public education, military service, substitute service and eligible unused state sick or personal leave. A member must match the employment history to the correct category before comparing costs.
For example, eligible out-of-state service can be subject to membership minimums and maximum purchase limits. Eligible unused state sick or personal leave may add one year but cannot be used to establish retirement eligibility.
Measure the benefit, not just the added year
One additional year normally increases an unreduced standard annuity by 2.3 percent of the average highest salary. But a purchase can be more valuable if it also moves a member across the Rule of 80 or another eligibility threshold.
Compare the quoted purchase cost with the annual increase, the expected start date and the effect on survivor options. This simple break-even view is not a recommendation, but it makes the trade-off visible.
Documentation and timing
Requests can require employer certification, military records or proof that service is not maintained elsewhere. Begin early enough to resolve missing records. TRS states that a purchase needed for eligibility must be completed by the effective retirement date.
Request a written cost statement and a retirement estimate both with and without the purchase. Do not assume a service type counts until TRS confirms it.
Match the employment history to the service category
TRS does not sell a generic year of credit. Withdrawn service, unreported service, out-of-state public education, military service, substitute service and eligible unused state sick or personal leave each have separate eligibility, documentation, limits and pricing rules.
Begin with the exact history: employer, dates, job type, compensation, whether another retirement system still holds the service and whether contributions were previously refunded. Ask TRS which category applies before requesting a cost. A quote under the wrong category is not a valid basis for a decision.
| Service type | Evidence commonly needed | Key question |
|---|---|---|
| Withdrawn TRS service | Prior account and refund history | What is the reinstatement cost with interest? |
| Out-of-state education | Employer certification and other-plan status | Must service be withdrawn from another plan? |
| Military service | Discharge and service records | Which statutory military category applies? |
| Substitute or unreported service | Employer payroll certification | Was the work creditable under the rule then in effect? |
| Unused state leave | Employer-certified eligible days | Can it increase the benefit but not establish eligibility? |
Calculate the first-year income increase
One additional year in the basic standard annuity adds 2.3 percent of the applicable average salary. At a $70,000 average, the first-year gross increase is approximately $1,610; at $90,000, it is approximately $2,070. Divide the purchase cost by the annual increase for a simple undiscounted break-even period.
That calculation is incomplete when the purchase changes eligibility. Credit that moves a member across the Rule of 80, a vesting threshold or another requirement can allow an earlier benefit or avoid a reduction. Conversely, some service—such as eligible unused leave under published rules—may increase the formula without being usable to establish retirement eligibility.
Use more than a simple break-even number
A purchase paid today and a pension increase received years later should not be compared as if both dollars occur at the same time. Record the payment date, retirement date, expected annual increase, survivor form and a range of lifetimes. A present-value calculation can be useful, but its discount and longevity assumptions must remain visible.
Also compare the use of the same money outside the pension, the loss of liquidity and the effect of a rollover if the purchase can be funded from an eligible account. Tax treatment is individual; obtain the current TRS payment instructions and qualified tax advice before moving retirement funds.
Timing and confirmation
Records from former employers, military archives or another state can take months to obtain. Start before the intended retirement year. TRS states that a service purchase required for retirement eligibility must be completed by the effective retirement date, but other administrative deadlines can also affect processing.
Request two written retirement estimates using the same date and payment option—one with the purchase and one without it. The difference should match the expected effect. Keep the cost statement, proof of payment and final service record.
Before you make a decision
- Identify the exact service-purchase category.
- Obtain a written cost statement and deadline.
- Calculate the annual pension increase.
- Determine whether eligibility changes.
- Compare official estimates with and without the purchase.
- Keep employer certifications and payment records.
Frequently asked questions
How much does one year of Texas TRS service add?
In the basic formula it adds 2.3 percent of the applicable average salary before reductions and payment-option adjustments.
Can purchased service help me reach the Rule of 80?
Some categories can affect eligibility; others cannot. Confirm the specific service category with TRS rather than assuming every purchased year counts the same way.
Can I buy out-of-state teaching service?
TRS publishes an out-of-state public-education category with membership, documentation and maximum-purchase requirements. Service maintained in another plan can affect eligibility.
Can I wait until after retirement to buy service?
A purchase needed for retirement eligibility generally must be completed by the effective retirement date. Begin early enough for certifications and payment processing.
Official sources
Sources were reviewed on August 19, 2026. Rules and member records maintained by the retirement system control.
TRS Texas — Purchasing service creditOfficial source ↗TRS Texas — Service credit purchase chartOfficial source ↗This article provides general educational information. It is not a benefit determination or financial, tax, or legal advice. Confirm account-specific information with the retirement system.