Bottom line
Service credit is not bought simply by paying a fee. NYSTRS must first verify an eligible service category. Prior New York public service and certain military service can qualify, and delay can increase purchase cost through interest.Key facts
- 2 years of current NYSTRS service are generally needed before prior service can be credited.
- 3 years is the general maximum for eligible active military service before NYSTRS membership.
- 6% of the applicable salary base is the Tier 6 cost per year for qualifying pre-membership military service.
Start with eligibility and verification, not the purchase price
NYSTRS prior service is work performed before the current membership date that was credited, or would have been creditable, in a New York State or New York City public retirement system. A member cannot create service credit for unrelated private employment by offering to pay for it. The claim begins with the service category, dates and former employer, and NYSTRS must verify the record before it can tell the member how much credit is available or what the purchase will cost.
NYSTRS states that prior service can be credited once the member has at least two years of service in the current membership. The member starts with Prior Service Claim PRS-2, which must be filed before the current membership ceases, while the former employer completes the appropriate verification form. Filing early preserves time to resolve older payroll records and can reduce interest that accumulates on the eventual purchase cost.
Military credit has separate limits for service before and during membership
NYSTRS distinguishes active military duty before membership from military service that interrupts membership. For qualifying pre-membership duty, active members may be able to purchase up to three years after reaching at least five years of NYSTRS service credit. Honorable-discharge documentation, or another qualifying discharge status recognized under New York law, is required. The available years cannot exceed the member’s net active service shown on the separation document.
Military duty that interrupts an existing NYSTRS membership follows a different rule set. NYSTRS explains that members may generally qualify for up to five years when they were under contract before the interruption and returned to an eligible position within the required reemployment period, though other statutory paths can apply. Because state and federal military-credit laws overlap, the System determines which authority and cost formula fits the member’s facts.
Tier and timing can change the bill substantially
For qualifying military service that preceded NYSTRS membership, the current NYSTRS publication describes a cost of 3% of the applicable salary base per year for Tiers 1–5 and 6% per year for Tier 6. The salary base is tied to the 12 months of credited service immediately preceding the year in which the claim is made. Different cost rules can apply to service that interrupted membership or to other prior-service categories.
NYSTRS repeatedly advises members to pursue prior service early because interest can make a later purchase more expensive. For pre-membership military service, payment after NYSTRS provides a cost must generally be completed by August 31 of the following plan year or a recalculation is required. A recalculated bill may be higher. The decision is therefore not just “is the credit eligible?” but also “when is verification complete and when does the quoted cost expire?”
Match the service to the correct claim pathway
A prior public-school job, a New York State agency job, military duty and a former retirement-system membership can all affect service credit, but they do not use one identical transaction. NYSTRS distinguishes prior service, transfer or reinstatement issues, and military service. The first task is to identify where the service occurred, whether it was creditable in a New York public retirement system and whether another pension is already payable on the same service.
Members who joined after April 24, 1962 cannot obtain prior-service credit for service on which they are already receiving, or are entitled to receive, a benefit from another public retirement system. This prevents the same service from being used twice. A former membership can also raise reinstatement questions that affect membership date and tier. Those issues should be resolved before evaluating the pension value of an extra year of credit.
| Service type | Starting document/action | Important threshold |
|---|---|---|
| Prior NY public service | PRS-2 claim + employer verification | Credited after at least 2 current-service years |
| Military before membership | Military-service claim + discharge records | Up to 3 years; generally 5 NYSTRS years first |
| Military interrupting membership | Military verification + reemployment review | Generally up to 5 years |
| Former NY public retirement membership | Transfer/reinstatement review | Cannot duplicate a benefit on same service |
Use the correct employer verification form for the payroll calendar
The member can submit PRS-2 through MyNYSTRS or on paper, but the former employer must also verify the employment. NYSTRS explains that employers operating on the July 1–June 30 school-year basis generally use Prior Service Verification PRS-3. Employers using another fiscal calendar can be asked to provide Monthly Salary and Service Verification PRS-3.5 so NYSTRS can align monthly salary and service with its school-year crediting rules.
Old employment records are a common bottleneck. A member should give the former employer enough identifying information to locate payroll, title and dates, then track whether the verification reached NYSTRS. The System cannot provide a final amount of service or purchase cost from the member’s recollection alone. If records are unavailable, ask NYSTRS which substitute documentation it will accept instead of improvising a package from unofficial sources.
Compare purchase cost with the specific milestone it may unlock
The value of service credit depends on what it changes. Extra credit can increase the pension factor and may move a member across an eligibility or age-reduction milestone. Twenty, twenty-five and thirty years have different significance across NYSTRS tiers, and the 2026 Tier 6 law makes 30 years especially important for members considering the new unreduced route beginning at age 58. A one-year purchase is therefore more valuable in some records than others.
The clean comparison uses an official estimate before and after the verified credit rather than a generic “cost per pension dollar” rule. Include the quoted purchase cost, the deadline, the pension-factor change, any effect on retirement eligibility and the time expected to collect the benefit. NYSTRS can explain what service it will credit; a member can then decide how that change fits the rest of the retirement plan without assuming every purchasable year is automatically worthwhile.
Before you make a decision
- List each prior public-employment and military-service period separately.
- Submit PRS-2 and send the correct verification form to the former employer.
- Wait for NYSTRS to verify credit and issue a cost before moving money.
- Compare the official pension estimate with and without the added credit.
- Pay or roll over funds before the quoted purchase deadline if proceeding.
Frequently asked questions
Can I buy credit for teaching before I joined NYSTRS?
Potentially, if the earlier work was New York public service that was credited or would have been creditable in a New York State or New York City public retirement system. The member must file a prior-service claim and the former employer must verify the employment. Private employment is not converted into NYSTRS credit merely by paying.
How long do I need to be in NYSTRS before prior service can be credited?
NYSTRS states that prior service can be credited once a member has at least two years of service credit in the current membership. Filing the claim earlier can still be useful because employer verification may take time and purchase costs can increase with interest while the claim remains unresolved.
How much military service can I buy in NYSTRS?
For eligible active military duty before NYSTRS membership, members may generally purchase up to three years after meeting the applicable conditions, including at least five years of NYSTRS service. Military duty that interrupted an existing membership can follow a different path and may allow up to five years under qualifying rules.
What does Tier 6 military service credit cost?
For qualifying military service before NYSTRS membership, the current NYSTRS publication describes a cost of 6% of the applicable salary base for each year purchased for Tier 6 members. Different laws and cost formulas can apply to interrupted military service, so NYSTRS must calculate the member-specific bill.
What form starts an NYSTRS prior-service claim?
The member starts with Prior Service Claim PRS-2, which can be submitted through MyNYSTRS or on paper. The former employer must then complete the appropriate verification document, commonly PRS-3 for school-year employers or PRS-3.5 when a different fiscal calendar requires monthly salary and service detail.
Official sources
Sources were reviewed on September 1, 2026. Rules and member records maintained by the retirement system control.
NYSTRS — Prior ServiceOfficial source ↗NYSTRS — Active Member FAQsOfficial source ↗NYSTRS — You Deserve the CreditOfficial 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.