FERS Supplement Calculator

Retire before 62 and you give up Social Security for a few years, so FERS adds a temporary payment that approximates the Social Security benefit you earned during your FERS service. It is separate from your basic annuity and it ends at 62. Compare it with your pension in the FERS retirement calculator, and see when claiming Social Security itself pays off in the Social Security break-even calculator. Your TSP balance is the other piece of the bridge to 62.

When it starts: an MRA + 30, age 60 + 20, special provision or VERA annuity starts the first day of the month after you separate, so retiring on January 15 starts the annuity (and the supplement) February 1. Discontinued service annuities start the day after separation (5 U.S.C. 8464(a)(1)). Discontinued service and VERA retirees under their MRA are entitled from the day they reach it. On top of the retirement type, you need at least one full calendar year of civilian FERS service, January 1 through December 30 or 31. Military service does not count toward that year (Handbook 51A1.1-3 D). Members of Congress and certain Senior Executive Service retirees are also covered by the rules; the calculator does not model them.

Sources: 5 U.S.C. 8421, 5 CFR 842.503 and OPM Handbook 51A1.1-3.

Formula: estimated Social Security benefit at 62 x (FERS civilian years of service / 40). The years are rounded to the nearest whole number, with half a year rounding up, and cannot exceed 40. Military service is left out. Both the Social Security estimate and the result are rounded down to the dollar. With a $2,000 estimate, 29 years 5 months counts as 29 years ($1,450) and 29 years 6 months counts as 30 ($1,500).

Your SSA statement is not OPM's number. OPM computes its own age-62 estimate: only FERS basic pay counts, years after age 21 without a full year of FERS service get deemed earnings, the years between your retirement and 62 count as zero, and OPM applies the bend points of the year your supplement starts as if you were 62 on January 1 of that year (5 U.S.C. 8421(b)(2)). Your Social Security statement counts every job you ever had and projects earnings if you keep working. If most of your lifetime earnings are federal and you retire close to 62, the statement is a fair proxy. If you spent years in the private sector, the statement overstates the FERS-only figure, and the calculator's FERS share box scales it down. Request a supplement estimate from your agency HR office or OPM for the figure OPM will use.

Example: born June 10, 1970, retire January 31, 2028 at 57 with 30 years (MRA + 30), SSA estimate $2,000 at 62: the supplement is $1,500 a month for 53 months, February 2028 through June 2032, $79,500 in all before the earnings test.

OPM Handbook chapter 51 worked examples, reproduced

The Handbook's worksheets (section 51B1.3) build the Social Security estimate from a full earnings history. The last lines turn it into the supplement. This table runs the same last steps with our code and matches OPM to the dollar. We do not rebuild the earnings history, which is why the calculator asks for your own SSA figure.

Schmidt retired November 30, 2020 and is paid December 2020 through December 2023 (37 months). Kasdan left under discontinued service at 55 years 4 months; his supplement began when he reached his MRA of 56 years 2 months in June 2021. The Handbook has no worked dollar example of an earnings-test reduction. It gives rules and one capped example (Liza, below), so the calculator's reduction schedule follows the statute and regulation rather than a published OPM computation.

If you work after retiring, the supplement (not your basic annuity) is reduced by $1 for every $2 you earn above Social Security's annual exempt amount for people below full retirement age. OPM uses the same amount SSA publishes (5 U.S.C. 8421a(b)(4); Handbook 51A3.1-1 B). Earnings means wages plus net self-employment earnings; annuity payments from OPM are not earnings.

Source: SSA, Exempt Amounts Under the Earnings Test and the 2027 fact sheet. SSA announces each year's amount with the October COLA; the 2027 amount is the latest. For later years the calculator assumes the 2027 amount and says so.

• The year after. Earnings in one calendar year reduce the supplement in the 12 months from July 1 of the next year through June 30 after that (5 U.S.C. 8421a(b)(5)). Testing begins with the first calendar year you are entitled to the supplement. Retire in June 2028 and your 2028 earnings, counted from your entitlement, are tested, with any reduction starting July 1, 2029.
• Only earnings while entitled count. Earnings before your supplement starts are ignored, and for the first year the reduction cannot exceed the supplement you received that year. The Handbook's example: Liza retires at the end of September 2020 on $500 a month. She received $1,500 in 2020, so her 2021 reduction cannot exceed $1,500 however much she earned in October through December (51A3.1-1 C Note 2). The calculator caps every year this way (5 U.S.C. 8421a(b)(2)(B)).
• Special category retirees (law enforcement, firefighters, air traffic controllers and military reserve technicians) are not tested until they reach their MRA, and earnings before the MRA do not count. Bruce in the Handbook retired at 52 as a firefighter and was not tested until June 2021, when he reached his MRA.
• Discontinued service and early-out retirees under the MRA are tested starting the year they reach the MRA and start receiving the supplement (Susan, Handbook 51A3.1-1 D Example 2).
• Reporting. OPM mails the FERS Annuity Supplement Earnings Report, form RI 92-22, in April and May and asks for it by June 30 if you earned more than the exempt amount or your supplement was reduced in a previous year (OPM retirement surveys). Failing to furnish earnings is cause to suspend the supplement (5 CFR 842.505(d)).
• Nothing is collected after it ends. Reductions apply only to supplement still payable. If the supplement ends before a reduction window finishes, OPM has not published how it handles that last period, so it may take more than the calculator shows. The calculator divides each reduction by the months actually paid in its July-to-June period and, when another reading would give less, shows how low the reduction could go. The 1986 repeal of the old provision only bars OPM from recovering leftover excess earnings from your basic annuity after the supplement ends (5 U.S.C. 8421a history); it does not say how the last months are charged.

Example with work income: same retiree as above, earning $60,000 a year. A full year of earnings is $34,440 over the 2027 amount, so $17,220 is withheld over 12 months ($1,435 a month), leaving $65 a month of the $1,500. Over the whole supplement the calculator shows $49,160.00 withheld and $30,340.00 received.

The supplement ends on the earlier of the last day of the month in which you become 62 and the last day of the month before the first month you could, on application, get Social Security (5 U.S.C. 8421(a)(3)(B)). You attain an age the day before your birthday. In the Handbook, Mary's 62nd birthday is September 1, so she attains 62 on August 31 and the supplement stops August 31. Sam's is September 2: Social Security could start in September, so his supplement also stops August 31. With a birthday on the 15th you turn 62 that month and are paid through the month's last day. It stops whether or not you claim Social Security.

The supplement is not increased by COLAs (Handbook 51A4.1-1 C). Your basic annuity gets COLAs from 62 for most retirees; special category retirees get them earlier. See FERS COLA 2027.

The House Oversight and Government Reform Committee's reconciliation print, marked up April 30, 2025 (CRS summary dated May 12, 2025), included Section 90002, "Elimination of the FERS Annuity Supplement". As summarized by the Congressional Research Service, it would have ended the supplement for new retirees not yet entitled to it before enactment, while preserving it for anyone separated from service under mandatory retirement provisions (CRS IF12996).

Status as of our review (October 24, 2026): the reconciliation law that was enacted, Public Law 119-21 (July 4, 2025), has no reference to 5 U.S.C. 8421 in its enrolled text (GovInfo), and the current statute shows no amendment since 2022. Some web pages say the supplement is eliminated starting in 2028; we found no such provision in the enacted law. New legislation can change this, so confirm on Congress.gov and with OPM before you plan around the supplement, especially if you are within a few years of retiring.

• OPM's own Social Security estimate from your FERS earnings history (you enter your SSA figure instead; the result is an estimate)
• Part-time service, leave without pay over 6 months in a year, refunded or nondeduction service, and breaks in service, all of which change the years or the earnings history
• Members of Congress and Senior Executive Service rules, and the air traffic controller instructor exemption (5 U.S.C. 8421a(c))
• The way OPM splits a reduction when the supplement ends partway through a reduction year (5 CFR 842.505(a)(2)); the calculator spreads each reduction over 12 months and stops at the end date
• Partial first and last month proration: payments are counted from the first full month
• Earnings that change from year to year: the calculator applies the same yearly earnings to every year