CSRS Retirement Planning: Pension Formula, Eligibility, and What's Changed

CSRS Is a Shrinking System With Unique Advantages

If you were hired before January 1, 1984, and never converted to FERS, you're in the Civil Service Retirement System — a defined-benefit pension plan that works differently from FERS in almost every important way. There are no new CSRS enrollees, so the workforce of CSRS employees gets smaller every year. That also means fewer HR specialists have deep CSRS expertise, which makes self-directed planning more important.

Here's what CSRS retirement planning actually requires: the pension formula, how Social Security has changed, what to do with voluntary contributions, and the timeline for getting your application through OPM cleanly.

The CSRS Pension Formula

Your CSRS annuity is calculated using a tiered formula based on your high-3 average salary (the three consecutive years of highest basic pay):

For 30 years of service with a high-3 average salary of $100,000:

• First 5 years: 5 × 1.5% × $100,000 = $7,500
• Next 5 years: 5 × 1.75% × $100,000 = $8,750
• Remaining 20 years: 20 × 2.0% × $100,000 = $40,000
• Total annual annuity: $56,250 (56.25% of high-3)

The maximum CSRS annuity is capped at 80% of your high-3, which you'd hit at roughly 41 years and 11 months of creditable service. Few employees reach this cap, but it matters for planning if you're close.

CSRS annuities receive full COLAs — unlike FERS, which caps the adjustment at 1% below the CPI increase when inflation exceeds 2%. In 2026, CSRS retirees received a 2.8% COLA compared to FERS retirees' 2.0%.

Social Security After the WEP/GPO Repeal

The single biggest change to CSRS retirement planning in decades happened on January 5, 2025, when the Social Security Fairness Act repealed both the Windfall Elimination Provision (WEP) and the Government Pension Offset (GPO). These provisions had reduced or eliminated Social Security benefits for workers who also received pensions from non-covered employment — which included most CSRS service.

What this means for CSRS employees planning retirement:

• If you have 40 quarters of Social Security coverage from non-federal work, your Social Security benefit is now calculated using the standard formula, without the WEP reduction. SSA completed retroactive adjustment payments back to January 2024 by mid-2025.
• If you're a spouse or survivor who was affected by GPO, your spousal or survivor Social Security benefit is no longer reduced by two-thirds of your CSRS pension.
• If you never applied for Social Security because of WEP/GPO, you need to file a new claim. SSA did not automatically award benefits to people who never applied — the retroactive payments only went to people already receiving reduced benefits.

This repeal fundamentally changes retirement income projections for CSRS employees with mixed federal and private-sector careers. If you worked in Social Security-covered employment at any point, verify your earnings record at ssa.gov and factor the unreduced benefit into your planning.

CSRS Offset: The Exception Within the System

CSRS Offset employees — those who were rehired after a break in CSRS service of more than one year, or who were in certain positions affected by the 1983 Social Security amendments — follow CSRS rules for annuity computation but with a key reduction. At age 62 (or upon becoming eligible for Social Security if later), the CSRS annuity is reduced by the Social Security benefit attributable to the CSRS Offset service period.

With WEP repealed, the Social Security benefit for Offset employees is now calculated at the full rate, which means the offset amount may be larger than what employees previously expected. Run both calculations — your unreduced CSRS annuity and the post-offset amount — to avoid surprises.

Voluntary Contributions: The Hidden Tax Advantage

CSRS and CSRS Offset employees who don't owe any service deposits or redeposits can open a Voluntary Contributions account by submitting SF 2804. This program allows after-tax contributions of up to 10% of your lifetime aggregate basic pay, earning interest at a rate set annually by Treasury.

At retirement, you have three options for the balance:

1. Purchase an additional annuity at OPM's actuarial conversion rate
2. Roll it over into an IRA (including a Roth IRA, with the earnings portion being taxable)
3. Roll it into the TSP

The Roth conversion angle is the primary draw. Your contributions were made with after-tax dollars, so only the interest earnings are taxable on conversion. For employees with high lifetime earnings and substantial room under the 10% cap, this can be a meaningful tax-advantaged move in the final years before retirement.

FERS employees are excluded from the Voluntary Contributions Program.

CSRS Eligibility and the Retirement Application

CSRS retirement eligibility is simpler than FERS:

• Age 55 + 30 years of service: Unreduced annuity
• Age 60 + 20 years: Unreduced annuity
• Age 62 + 5 years: Unreduced annuity

There's no MRA table based on birth year — the age thresholds are fixed. Early retirement under VERA or discontinued service follows the same rules as FERS (age 50 + 20, or any age + 25).

The CSRS retirement application is SF 2801, submitted through OPM's Online Retirement Application (ORA) portal. The spousal consent form is SF 2801-1 (different from the FERS version). All the same digital submission requirements apply: clean PDFs, no correction marks, notarized spousal consent if electing less than the maximum survivor benefit.

Service Deposits and Redeposits

If you have periods of non-deduction civilian service (time when retirement contributions weren't withheld), you need to decide whether to pay the deposit:

• Service ending before October 1, 1982: The service counts toward your annuity even without the deposit, but your annuity is permanently reduced by 10% of the unpaid deposit balance.
• Service ending on or after October 1, 1982: You must pay the full deposit for the service to count. No deposit, no credit.

Redeposits cover periods where you previously withdrew your retirement contributions (took a refund). If you took a refund for CSRS service, you must repay the amount plus interest to have that service credited.

Complete all deposits and redeposits before separation. OPM cannot finalize your annuity calculation with outstanding deposit obligations.

The CSRS Retirement Countdown

The same 5-year countdown that applies to FERS works for CSRS, with a few differences:

• No FERS Supplement: CSRS retirees don't receive the Special Retirement Supplement, so there's no earnings test to plan around.
• Full COLAs: Your annuity keeps pace with inflation more effectively than FERS.
• Different TSP matching: CSRS employees don't receive the automatic 1% or matching contributions that FERS employees get, but you can still contribute the full elective deferral and catch-up amounts.

The Federal Retirement Countdown Checklist covers both CSRS and FERS timelines in parallel, including the forms, deadlines, and verification steps specific to each system.