One of the most common questions I get after an approval is when the first payment will actually arrive. It is a reasonable thing to want to know, and the honest answer has a few moving parts. Here is how it usually works, and what to plan around while you wait.
General educational information only. TFDR is not a law firm or a financial advisory firm, does not provide legal, financial, or tax advice, and does not represent applicants before OPM or predict individual outcomes.
The approval letter doesn't start the payments
This is the part that surprises people. The approval is OPM saying yes to the disability retirement. It is not OPM saying the money is on its way.
If you are still employed when the approval comes, your agency has to process your separation and send your retirement package to OPM. Nothing can be paid until OPM has that package in hand.[1] So the first stretch of waiting depends on how quickly your agency finishes its side, and that varies a lot from one agency to another.
If you were already separated, OPM may still need agency payroll, service or other records before it can calculate and authorize payment. An approval does not establish that the financial file is complete.
The annuity commencement date is governed by 5 CFR 844.301 and depends on pay status and separation; it is not the date of the first deposit. Any adjustment depends on the benefits actually due and applicable offsets.
Where the CSA number comes in
Once OPM has your file, it assigns you a claim number, called a CSA number, and sets you up in its retirement system.[1] That number is your identity with OPM from here on. It goes on every letter, every call, and every login to OPM Retirement Services Online, which allows eligible annuitants to manage their benefits and contact or payment information. Follow OPM’s instructions for your claim status.
Keep it somewhere you can find it. When you contact OPM about anything, the first thing they ask for is the claim number, and a call goes much faster when you have it ready.
Interim pay: what it is and how long it lasts
OPM may authorize interim payments while completing the benefit calculation. Assignment of a CSA number alone does not promise a payment or payment date.
Interim pay is a partial payment of the estimated benefit. Its amount depends on the case; no percentage is guaranteed for a disability claim.
There is no fixed duration for interim pay. Missing records, computation issues or benefit coordination can affect the time needed to finalize a claim; plan from OPM notices specific to your case.
A few details about interim pay that catch people off guard:
- Only federal income tax is withheld. State tax and your health and life insurance premiums are not taken out during interim pay, even though your FEHB and FEGLI coverage stays active.[2]
- Those premiums come due at the end. When OPM finalizes your case, the insurance premiums that were not withheld during interim pay are deducted from the adjustment payment.[1] That is one reason the back-pay deposit is often smaller than people expect.
- Payments arrive on the first business day of the month and cover the previous month, so the deposit that arrives June 1 is for May.[1]
The final calculation, and the adjustment that follows
When the final calculation is done, your regular monthly annuity begins. OPM then reconciles what it paid during interim against what you were actually owed.
If the interim payments were lower than your final annuity, OPM pays you the difference in an adjustment payment.[1] The adjustment depends on the final computation.
In some cases, though, the final numbers come out lower than the interim payments, and OPM recovers the overpayment. This can happen when Social Security disability is involved, because SSDI reduces the FERS disability annuity[4] and the two agencies do not always finalize at the same time. If OPM set up your interim pay before it knew your SSDI amount, the final annuity can drop once that offset is applied, and the months already paid at the higher rate become an overpayment.
Because of that, many people choose to treat the interim period carefully and set aside the SSDI payments in particular until the final annuity is in place. Once the actual numbers are known, it becomes clear what is yours to keep. What is right for your situation depends on your own finances, and that is a conversation to have with a licensed financial or tax professional.
Plan around the first-year number, not your old salary
For under-62 applicants not eligible for immediate voluntary retirement, the usual formula is 60% of high-3 for the first 12 months minus 100% of concurrent SSDI, then 40% minus 60% of SSDI. The earned annuity applies if larger. Age-62 and immediate-retirement cases have different computations; deductions further affect net pay.
An educational estimate can help with planning, but only OPM determines your payment. Check the computation and deductions in your individual notice.
If you're in the waiting period now
Two steps are worth more than anything else during this stretch:
- ☐ Confirm your agency has submitted your package to OPM. Ask your HR or retirement office directly and get a date. Until OPM has the package, the clock has not really started.
- ☐ Keep your CSA number available for any contact with OPM, and follow the access and status instructions OPM gives you. Contact OPM when the available status information does not answer your question.
Beyond that, the most useful mindset is to treat interim pay as what it is: a bridge, not the destination. The final numbers will come. Knowing ahead of time that they can move in either direction is what keeps the adjustment from being a bad surprise.
Sources
[1] OPM, Retirement Quick Guide — what happens after separation, interim payments, the adjustment payment and premium deductions, payment dates — opm.gov
[2] OPM, Retirement FAQ: Interim pay during retirement processing — opm.gov
[3] OPM, Retirement FAQ: Understanding annuity payments — opm.gov
[4] 5 U.S.C. § 8452 — FERS disability annuity computation and the Social Security offset — uscode.house.gov
[5] 5 CFR Part 844 — FERS disability retirement (eligibility, applications, computation, termination) — ecfr.gov
Earlier personal-experience payment timelines and typical amounts were removed; they are not reliable promises for another applicant.