FERS Supplement: A Plain-English Guide

The FERS supplement, also called the FERS annuity supplement or special retirement supplement, is a temporary payment some FERS retirees may receive on top of their basic annuity. It generally applies to certain immediate retirements before age 62 and ends no later than the month a retiree reaches 62, according to OPM.

Rules below reflect the U.S. Office of Personnel Management (OPM) pages and publications listed under "Sources" at the end of this article, reviewed on October 26, 2026. OPM can change its guidance, and eligibility and amounts depend on individual circumstances. This article is educational and is not personal advice.

Who may be eligible for the FERS supplement?

OPM's pamphlet RI 90-8, Information for FERS Annuitants says a person who retired voluntarily on an immediate annuity that is not reduced for age may receive the supplement. OPM's Types of Retirement page lists two unreduced voluntary retirements that fit this description:

• Retirement at your Minimum Retirement Age (MRA) with 30 years of service.
• Retirement at age 60 with 20 years of service.

OPM also says some people may receive the supplement after an involuntary retirement before MRA, a voluntary retirement tied to a major reorganization or reduction in force, or an early retirement for Members of Congress. In those cases, OPM says payment does not start until the retiree reaches MRA.

Your MRA depends on your birth year. OPM's table runs from 55 to 57, and people born after 1969 have an MRA of 57.

OPM says the supplement is not payable to people receiving a deferred annuity, a disability annuity or an immediate MRA+10 annuity. For a retirement with both CSRS and FERS components, OPM says you may still receive the supplement, but you must complete one full calendar year of service subject to FERS computation rules.

Whether you qualify depends on your retirement type, your service history and your birth year. Your agency benefits office or OPM can confirm your own situation.

How is the FERS supplement calculated?

According to RI 90-8, the supplement represents what you would receive from Social Security for your FERS civilian service. OPM calculates it as if you were age 62 and fully insured for Social Security when the supplement begins.

In general terms, OPM first estimates your full-career (40-year) Social Security benefit. It then reduces that estimate to reflect the amount of your civilian service under FERS. OPM's own illustration in RI 90-8 divides years of FERS service by 40.

Two other points from OPM:

• The supplement is paid in addition to your gross monthly FERS annuity.
• OPM's Benefits Administration Letter 26-101 says FERS cost-of-living adjustments apply to the basic annuity, not to the annuity supplement.

What about a FERS supplement calculator?

Online calculators can give a rough estimate, but OPM calculates the actual amount. The result depends on the Social Security estimate OPM uses and on your years of FERS service, so a calculator is only a starting point. A federal benefits specialist can help you review the inputs. Our federal employee retirement planning page describes how we approach those projections.

How can the earnings test affect the supplement?

OPM says the supplement is subject to an earnings test, similar to the one Social Security applies. It may be reduced if your earnings in the preceding year are above the Social Security exempt amount.

• OPM says the supplement is reduced by $1.00 for every $2.00 of earnings over the exempt amount, and it could be reduced to $0.
• The test applies to the supplement only. OPM says your FERS basic benefit is not reduced.
• OPM counts wages for service performed in the year plus net earnings from self-employment, minus any net self-employment loss. Your FERS annuity is not counted as earnings.
• OPM says there is no reduction until after the first calendar year you receive the supplement, and you must report your earnings to OPM when it asks.
• OPM's Benefits Administration Letter 26-101 lists $24,480 as the 2026 earnings limit. Social Security sets this amount each year, so it changes.

OPM also describes an exception: for certain special-category retirees, such as law enforcement officers, firefighters and air traffic controllers, the earnings test does not apply until they reach MRA. Check OPM's current guidance to see whether it applies to you.

If you plan to work after you retire, the earnings test is worth understanding before you choose a retirement date.

How does the supplement fit with Social Security timing?

OPM says the supplement is paid until the earlier of two dates: the last day of the month before the first month you would be entitled to actual Social Security benefits, or the last day of the month in which you reach age 62.

OPM's FAQ on the supplement after age 62 adds that the supplement stops even if you wait to apply for Social Security. OPM says you are not required to apply at 62 and can apply later to receive an increased benefit.

That means the supplement is not a substitute for a Social Security claiming decision. The two timelines are related but separate, and the best order depends on your health, other income, spouse, taxes and goals. Our federal employee retirement planning team can walk through those trade-offs with you. Any strategy involves trade-offs, and no outcome is guaranteed.

Common questions about the FERS supplement

What is a FERS annuity supplement?

It is a temporary payment OPM may add to the FERS annuity of certain retirees who leave federal service before age 62. OPM describes it as representing what you would receive from Social Security for your FERS civilian service, and it is a separate component from the basic annuity.

How long does the FERS supplement last?

According to OPM, it is paid until the earlier of the last day of the month before you would first be entitled to actual Social Security benefits, or the last day of the month in which you reach age 62. OPM says it stops even if you delay applying for Social Security.

How much will the FERS supplement be?

The amount depends on your estimated Social Security benefit and your years of FERS civilian service, and it may be reduced by the earnings test. OPM calculates the figure, so check with OPM or your agency benefits office for your own estimate.

Can I collect both FERS and Social Security?

OPM describes the FERS retirement package as made up of benefits from Social Security, the Thrift Savings Plan and the FERS basic benefit. The supplement is the piece that ends by age 62. OPM says you can apply for Social Security at 62 or later, and your own eligibility and timing depend on your Social Security record.

Who is generally not eligible for the supplement?

OPM says the supplement is not payable to people receiving a deferred annuity, a disability annuity or an immediate MRA+10 annuity. It also requires at least one full calendar year of service subject to FERS.

Next steps

Federal benefits have many moving parts, and the supplement is only one of them. The Federal Employees page explains the Fed-Wealth Optimization Audit and how Pathways Retirement Advisors works with FERS and CSRS employees.

Schedule a visit to review your federal benefits.

Sources

All sources are from OPM and were reviewed on October 26, 2026.

• Information for FERS Annuitants (RI 90-8)
• Types of Retirement, OPM Retirement Center
• Benefits Administration Letter 26-101, Annual Changes
• Will the FERS Annuity Supplement continue after age 62? (OPM FAQ)

This article is for general educational purposes only. It is not personalized investment, tax or legal advice, and it does not suggest that any strategy is suitable for you.