Service Computation Date (SCD): Complete Guide for Federal Employees (2026)

Your SCD is not just a date on your SF-50 — it determines how fast you earn annual leave, when you become eligible to retire, where you rank if your agency faces a RIF, and when your TSP vests. Most federal employees know they have an SCD but few understand how it's calculated, why it differs from their hire date, or how events like breaks in service and LWOP affect it.

What is a Service Computation Date?

A Service Computation Date (SCD) is a computed date — not necessarily the date you were first hired — that the federal government uses to determine your eligibility for a specific benefit. Because different benefits count different types of service, you can have up to four different SCDs, each set to a potentially different date:

Because they count different types of service, these four dates can all fall on different calendar dates. An employee with prior non-federal work experience (under an OPM-approved waiver) may have an SCD-Leave that differs from their SCD-Retirement. An employee with military service that they have not bought back may have an earlier SCD-Leave than SCD-Retirement.

SCD-Leave: Annual leave accrual

SCD-Leave is the SCD most federal employees encounter first. It determines which of the three annual leave accrual tiers applies to you:¹

The rate increase is automatic — you do not need to request it. When your SCD-Leave milestone arrives (the 3-year or 15-year mark), your agency's payroll system increments your accrual rate in the next pay period.

SES and equivalent positions: Senior Executive Service members and employees in SL/ST scientific or professional positions accrue 8 hours per pay period (26 days/year) regardless of service length, from their first day in those positions.²

What counts toward SCD-Leave

• Federal civilian service — including temporary, term, and permanent appointments
• Active duty military service — generally credited even without the FERS military buyback deposit³
• Certain non-federal work experience — when OPM or an agency grants a waiver (less common; typically for hard-to-fill positions)
• Prior service that was separated by a break — previous creditable service is restored when you return to federal employment

What does NOT count toward SCD-Leave

• The break period itself when you were not in federal service
• Leave Without Pay (LWOP) in excess of 6 months in any calendar year (the excess is subtracted from your SCD-Leave)
• Time in a non-pay status for extended periods beyond OPM limits

SCD-Retirement: FERS eligibility and annuity

SCD-Retirement (sometimes called the FERS Service Computation Date or "basic pay SCD") determines:

1. Whether you've met the service requirements to retire (minimum 5 years for deferred retirement, 10 years for MRA+10, 20 or 30 years for full annuity)
2. The number of creditable years used to calculate your FERS annuity: years × high-3 salary × 1.0% (or 1.1% with 20+ years at 62)

Key difference from SCD-Leave

Part-time service is prorated for SCD-Retirement but not for SCD-Leave. If you work a 50% schedule for 4 years, that counts as 4 calendar years for SCD-Leave (moving you through the accrual tiers), but only 2 years of creditable service for SCD-Retirement (for both eligibility and annuity computation).⁴

What counts toward SCD-Retirement

• Civilian federal service under FERS/CSRS (prorated for part-time)
• Military service after making the FERS military buyback deposit (3% deposit rate, 4.25% interest in 2026)
• Civilian service for which you've paid the service deposit (pre-1989 non-deduction service at 1.3%)
• Creditable military service for those not receiving military retired pay

See the FERS Military Buyback Guide and Civilian Service Deposit Guide for how to convert non-creditable service into creditable service.

SCD-RIF: Retention standing

If your agency conducts a Reduction in Force (RIF), your retention standing is determined by four factors, and SCD-RIF is one of them. It is typically the most expansive SCD — counting virtually all creditable military and civilian service. Additionally, you receive extra service credit based on your recent performance appraisals (up to a maximum of 20 additional years of credit for a sustained record of Outstanding ratings).⁵

The net effect: SCD-RIF is often the earliest (longest-service) of your SCDs, because it counts service that may not count for leave or retirement, and adds performance credit on top.

See the Federal Employee RIF Guide for the full retention register framework.

SCD-TSP: Vesting

The SCD-TSP is used only for employees covered by FERS to determine when they become vested in the agency automatic 1% contribution (the automatic contribution that all FERS employees receive regardless of whether they contribute themselves). FERS employees are fully vested in the agency 1% automatic contribution after 3 years of creditable service.⁶

The agency matching contributions (dollar-for-dollar on your first 3%, 50 cents on the next 2%) vest immediately — you keep them from day one.

How key events affect your SCDs

Break in service

When you leave federal employment and return, the break period does not count toward any SCD — but your prior service does restore. Your SCD-Leave is recalculated after the break: OPM sets it to a date that reflects your total creditable service, excluding the break. If you worked 8 years, left for 2 years, and returned, your SCD-Leave would be set approximately 8 years before your return date (not 10).

One important consequence: a break in service can drop your annual leave accrual tier. An employee who had accumulated 14 years of service (in the 6-hour tier), left for 2 years, and returned would re-enter with 14 years of credit — still in the 6-hour tier and only 1 year away from the 8-hour tier. But an employee who had 2.5 years of service, left for 1 year, and returned would have only 2.5 years of credit — back in the 4-hour tier until they cross 3 years again.

LWOP (Leave Without Pay)

Up to 6 months of LWOP per calendar year is fully creditable. LWOP beyond 6 months in a single calendar year is subtracted from your SCD. The effect accumulates: multiple years of extended LWOP can shift your SCD-Leave significantly forward (reducing your credited service).

LWOP has the same rules for SCD-Retirement as for SCD-Leave — up to 6 months per year counts toward your FERS service credit for both retirement eligibility and annuity computation.

Military service

This difference is the reason the military buyback matters: your military service already counts for SCD-Leave (so your annual leave accrual reflects it), but it only boosts your FERS annuity and retirement eligibility date once you make the deposit. See the FERS Military Buyback Calculator to model the break-even.

Part-time service

Part-time service counts at full calendar time for SCD-Leave (moving you through the accrual tiers just as fast as a full-time employee), but at a prorated value for SCD-Retirement. A GS-12 working a 60% schedule for 5 years would show 5 years toward SCD-Leave thresholds, but only 3 years (5 × 60%) toward FERS retirement eligibility and annuity.

See the FERS Part-Time Retirement Guide for the proration factor formula and how it affects your annuity.

Worked example: GS-14 with prior Army service and a break

Consider a GS-14 Step 7 at the Department of Veterans Affairs, currently 52 years old:

• Active duty Army: 6 years (honorable discharge, no military retired pay)
• First federal civilian appointment: age 28, lasted 3 years (left at age 31)
• Break: 4 years in the private sector (ages 31–35)
• Second federal civilian appointment: age 35, continuous since then (17 years)
• FERS military buyback: not yet paid

Current SCD-Leave calculation:

• Prior creditable service: 6 years military + 3 years first appointment + 17 years current = 26 years
• SCD-Leave: 26 years before today = approximately 2000 (at current age 52)
• Annual leave accrual: 8 hours/period (15+ year tier) ✓

Current SCD-Retirement calculation (without buyback):

• Creditable service: 3 years first appointment + 17 years current = 20 years civilian (military not credited — no buyback deposit)
• SCD-Retirement: approximately 32 years before today = approximately 1994 at first appointment
• Wait — the 4-year break doesn't count. Actual: 20 creditable civilian years.
• SCD-Retirement reflects only 20 years → retirement eligibility at 56 (age 52 now = needs 20 years more? No wait...)

Where to find your SCDs

1. SF-50 Block 31: Your current SF-50 shows SCD-Leave as "Service Comp Date (Leave)." Access your SF-50s through your agency's HR system, OPM's Employee Personal Page (EPP) at servicesonline.opm.gov, or the National Personnel Records Center (NPRC) for older records.
2. LES (Leave and Earnings Statement): Your pay stub shows your leave balance and current accrual rate — from this you can infer which tier you're in.
3. Agency HR office: Your HR office can provide a complete service history showing each type of SCD, including the SCD-Retirement and SCD-RIF, which may not appear directly on the SF-50.

Correcting a SCD error

SCD errors are more common than people expect, particularly when prior service hasn't been properly captured, military service wasn't added, or LWOP was miscalculated. The process:

1. Request your complete personnel file from your agency HR or via eOPF (electronic Official Personnel File).
2. Identify the discrepancy: trace each period of service and compare against what your SF-50 reflects. Look for any periods that should be credited but appear to be missing.
3. Submit documentation to HR: DD-214 for military service, prior SF-50s for prior federal service, or any court/payroll records for disputed periods.
4. Escalate if unresolved: OPM has appeals procedures if your agency does not correct a documented error. Formal appeals to the Merit Systems Protection Board (MSPB) are available as a last resort.

Errors in SCD-Leave directly affect your annual leave accrual — you may have been earning fewer hours per period than you're entitled to. A correction can retroactively restore the deficit.

How SCD connects to your retirement planning

Your SCDs are the foundation of every retirement calculation. Your FERS eligibility date, annuity computation, and the value of any deposits or buybacks all trace back to your SCD-Retirement. Before you can model your retirement accurately:

• Verify your SCD-Retirement reflects all creditable service (including any deposits you've already paid)
• Determine whether a military buyback or civilian service deposit changes your eligibility date or pushes you above the 30-year threshold for MRA+30 retirement
• Confirm your part-time proration factor if you have ever worked a reduced schedule

A federal-benefits specialist advisor can review your full service history and identify optimization opportunities before you file. Connect with an advisor who specializes in FERS.

1. 5 U.S.C. §6303 — Annual leave; accrual (LII / Cornell Law School)
2. OPM Fact Sheet: Annual Leave Accrual Rates for SES, SL/ST Positions
3. OPM Fact Sheet: Creditable Service for Annual Leave Accrual (Uniformed Service)
4. My Federal Retirement: Service Computation Date (overview of SCD types)
5. OPM: Reductions in Force — Retention Standing and Competitive Area
6. TSP.gov: Vesting in Agency Contributions (FERS employees)

Values verified as of July 2026. Annual leave accrual rates under 5 U.S.C. §6303 are statutory and do not change annually. SCD-Retirement rules are governed by 5 U.S.C. Chapter 84 (FERS) and Chapter 83 (CSRS). Military buyback deposit rate and interest confirmed against OPM BAL 26-301.