What Is OPM Interim Pay, and Why Are the First Checks Smaller Than You Expected?
Updated September 29, 2026
Jay SasportasRetired fed, 33 years. Seven months in the same wait.Quick answer
Interim pay is the temporary, estimated payment OPM issues while it finalizes your case. OPM quotes it as “typically 60 to 80% of your estimated net annuity,” but that estimate excludes your FERS supplement entirely, takes out no insurance premiums yet, and withholds federal tax only. So it isn’t a preview of your real check, and a low one isn’t a verdict on your case.
First check smaller than every estimate? The free tracker shows the sequence that follows it, against cases like yours.
The first deposit lands, and it’s smaller than every estimate you ever ran. Mine was too, and I’d run a lot of them.
That’s interim pay. Here’s what it is, why it’s smaller by design, what gets corrected at finalization, and the one part that quietly stays your problem.
What is interim pay?
A placeholder. While OPM works through your case, it puts you on an estimated payment to keep money flowing, then trues it up when the case finalizes. OPM’s own portal text:
You have been placed into interim pay pending the finalization of your retirement case.
How fast it starts. OPM’s published average for issuing interim pay has run in single-digit days in recent months; the current figure is on the numbers page.
Read the fine print on that clock, though. It starts “once OPM receives the complete retirement application package from the agency.”
Your agency HR and payroll finish their work first. So the interim clock does not start at your retirement date; it starts when OPM gets the file.
In the field, many people see interim pay within weeks of OPM receipt. The tail is long, though: retirees have reported 26 to 30 weeks to a first interim payment, and some report months with nothing.
One retiree’s whole situation, in a July 2026 Facebook post: “7 months and counting. Not one dime.”
One sequencing quirk retirees report: the interim deposit can show up before your CSA welcome letter does. A deposit with no paperwork yet is a known sequence.
What that early mail is, and when it arrives, is on the CSA number page.
Why is my interim pay so low?
Three separate reductions stack on the same check:
- It’s a fraction of an estimate. OPM’s published band is “typically 60 to 80% of your estimated net annuity.” (OPM’s own pages aren’t fully consistent; another page says “generally 80%.”) Either way, the percentage applies to an estimate of your net, never to the number you’ll eventually live on.
- Your FERS supplement isn’t in it at all. If a chunk of your expected income is the supplement, your interim will run well below any estimate that included it.
- No insurance deductions are coming out yet. FEHB and FEGLI premiums aren’t deducted during interim. That makes the check look bigger than it otherwise would, and those premiums get collected retroactively at finalization.
On the supplement, OPM says it directly:
Your interim payment does not take into account any annuity supplement you may be eligible to receive.
And the band itself deserves a decode. It’s OPM’s quoted target, never a promise and never a floor. Retirees report actual interim amounts everywhere from about 10% to about 92% of what they expected, with roughly half below 60%.
One retiree whose interim came in around 29% of expected described it as a mismatch between the published figures and lived experience.
A low interim is a fact about the estimate OPM could compute from your file at that moment. It isn’t a pass or fail reading on your case.
What about taxes during interim pay?
This is the quiet part, and it’s worth knowing early.
Only federal income tax is withheld during interim pay, and retirees report the amount withheld being small or nothing. State tax can’t be withheld at all, in OPM’s own words:
State tax is not deducted from interim payments.
And on its tax page, OPM adds that it “cannot set up a state tax withholding for annuitants who are receiving interim payments.”
Retirees say it plainly. One, in a Facebook retirement group:
Don’t forget you need to make up for the taxes not taken out of your interim payments or you will end up owing at the end of the year. To catch up, I had to take an additional $1100 a month out.
Another, on the withholding that did happen: “February through May, they only withheld $141 each month, which was way to little!” A third summed up the state side as “just a nice big state tax bill.”
I’m describing how the machinery works, and nothing more. Withholding choices are yours, and your tax professional’s if you use one.
What gets corrected at finalization, and what doesn’t?
Several things reconcile at once when your case finalizes. Here’s the split:
| What happens | Where it shows up | |
|---|---|---|
| The annuity | Trued up. A one-time catch-up payment for the gap between what interim paid and what your computed annuity should have paid. | To your bank as its own deposit (a paper check only if you’re paid by check); the statement of your interim-period transactions comes by mail. Never in Services Online. |
| The FERS supplement | Back-paid, folded into the annuity figure in your booklet. | The booklet math, not a separate labeled line. |
| The skipped premiums | Collected. The FEHB and FEGLI premiums that weren’t deducted during interim come out retroactively. | Your first full payments. |
| Your booklet | Arrives. | Mail, “within 2-3 weeks” of finalization. |
| The taxes | The exception. OPM’s adjustment covers the annuity amount. | Retirees consistently report the under-withheld tax from the interim months was theirs to settle. |
OPM’s own checkpoint text on the catch-up, and note both halves of it:
You can expect to receive a statement that details account transactions that occurred during interim pay and an annuity adjustment payment in the mail. This one-time payment will not, however, be available in Services Online.
Two things in that sentence, and they travel differently. The statement of your interim-pay transactions comes in the mail. The payment lands in your bank as its own deposit (the same account as your monthly payments; a paper check only if you’re paid by check), and it never shows in your Services Online history. Refreshing that page for your back pay is looking in the wrong place by design.
Retirees hunting for a separate “supplement payment” have found it was inside the booklet math all along. Worth knowing before the scare.
After finalization, once you have your CSA number and Services Online credentials, you can manage withholding on the annuity in Services Online. Before that, the channels are mail (Form W-4P) or phone, per OPM’s pages and a practitioner guide.
For everything else that lands after the “Finalized” status flips, see the finalized page.
Track your own case free
Log your interim deposits and dates as they land. The free tracker shows the money-and-mail sequence against cases like yours, so a small first check reads as the placeholder it is.
Months on interim and want to ask OPM where the case is? The Limbo Kit ($19) carries the written help request and the escalation ladder, in order.
Can’t get OPM on the phone? Start with the phone line, decoded from real calls. It’s free.
Common questions
- Is interim pay 80% of my pension?
- That’s the folk version, and it’s off in two ways. OPM’s published band is “typically 60 to 80% of your estimated net annuity,” and the operative words are estimated net: that estimate excludes your FERS supplement and has no insurance premiums deducted yet. Retirees report actual interim amounts from about 10% to about 92% of expected, so treat the band as OPM’s target, never a formula.
- Does OPM take out state taxes from interim pay?
- No. OPM says state tax is not deducted from interim payments and cannot be set up during interim. Only federal tax is withheld, and retirees often report even that is minimal.
- Will OPM pay back the difference when my case is finalized?
- Yes, for the annuity itself: finalization brings a one-time annuity adjustment payment, deposited to your bank as its own payment, plus a statement of the interim-period transactions by mail (per OPM, that one-time payment will not appear in Services Online). Your excluded FERS supplement is back-paid inside the booklet figure. The under-withheld taxes from interim months, retirees report, are yours to settle.
- I got an interim deposit but no letter from OPM. Is that normal?
- Retirees have reported exactly this: the money can beat the mail. Interim pay arriving before the CSA welcome letter is a reported sequence, and nothing about it says something’s wrong.