When OPM pays your annuity, and what the deposit says
OPM pays your annuity on the first business day of each month, and each payment covers the previous month. Most retirees see it land as OPM1 TREAS 310 XXCIV SERV. That string looks alarming the first time you find it on a statement. It is Treasury’s standard format for a federal payment, not a sign that anything went wrong.
6 min read · By RetireCiv Editorial · Updated August 14, 2026
When does OPM pay your annuity each month?
Your annuity is paid monthly, and it is paid in arrears. OPM states the rule plainly: your retirement annuity is paid each month and covers the period for the previous month, usually on the first business day of the month. The deposit that lands on June 1 is your May annuity.
That word "usually" is doing real work. When the first falls on a weekend or a federal holiday, the payment moves to the next business day. It does not arrive early. Your own bank adds a second variable, since institutions differ in how quickly they post an incoming ACH deposit once Treasury releases it.
Nothing about the schedule shifts through the year. Twelve payments, each covering the month before it, and no thirteenth. Which month your first payment covers depends on the retirement date you pick, which is one more thing that date decides.
What each payment covers
| Payment arrives | Covers your annuity for |
|---|---|
| First business day of May | April |
| First business day of June | May |
| First business day of July | June |
When does OPM pay your annuity each month?
On the first business day of the month, covering the previous month. OPM pays in arrears, so the deposit you receive on June 1 is your May annuity. There are twelve payments a year on this cycle, with no quarterly or annual variation.
What happens when the first of the month falls on a weekend or holiday?
The payment moves forward to the next business day. It is never released early. If the first is a Saturday and the following Monday is a federal holiday, expect the deposit on Tuesday. Your bank may post it later still, depending on how it handles incoming ACH deposits.
What does OPM1 TREAS 310 XXCIV SERV mean?
It is a federal payment, described the way Treasury describes all of them. The Bureau of the Fiscal Service sends government payments over the ACH network with the paying agency in one field and the purpose of the payment in another. Their own worked example is a tax refund, which arrives as IRS TREAS 310 with a description of TAX REF.
Your annuity follows the same shape. The agency portion identifies OPM as the payer, and TREAS 310 marks it as a Treasury-disbursed federal payment. The trailing description names the payment type, Civil Service retirement, which is what separates it from a refund or a benefit paid by another agency.
The string is not an error code. It does not signal that your case is unresolved, and it does not mean the amount is provisional. Every annuitant on direct deposit sees some version of it every month.
Reading the deposit description
| On your statement | What it identifies |
|---|---|
| OPM1 | The paying agency, the Office of Personnel Management |
| TREAS 310 | A federal payment disbursed by Treasury over the ACH network |
| XXCIV SERV | The payment type, Civil Service retirement |
What does OPM1 TREAS 310 XXCIV SERV mean on a bank statement?
It is your monthly federal retirement annuity, described in Treasury’s standard format for government payments. The first part names OPM as the paying agency, TREAS 310 marks it as a Treasury-disbursed federal payment, and the last part identifies it as Civil Service retirement. It is not an error code and needs no action.
Is a TREAS 310 deposit the same as a tax refund?
No, though both use the TREAS 310 marker. That marker only tells you Treasury disbursed the payment. The agency name and the description that surround it are what identify the payment. A tax refund arrives as IRS TREAS 310 with a description of TAX REF, which is a different agency and a different purpose from your annuity.
Why do your first payments look different?
New retirees often find the schedule working exactly as described while the amount looks wrong. That is usually interim pay rather than a payment error. OPM sends a partial, estimated amount on the normal monthly cycle until it finishes reviewing your case, then issues an adjustment to catch up the difference. Your final paycheck and leave payout come from your agency instead, on their own schedule, so those land independently of anything OPM does.
The timing and the mechanics of that stage are their own subject. Our lesson on OPM processing time and interim payments covers how long the review takes and roughly what share of your final amount to expect meanwhile. It also explains which pieces of your benefit are left out until your case is finalized.
Why is my first annuity payment a different amount?
Because it is probably interim pay, not your finalized annuity. OPM sends an estimated partial payment on the regular monthly schedule while it reviews your case, then issues an adjustment covering the shortfall once your exact benefit is calculated. The payment dates stay the same throughout; only the amount is provisional.
Where do you find a record of your payments?
OPM Retirement Services Online holds it. Signing in and choosing Verification of Annuity lets you pick a payment period and save or print the statement for that period. The same document doubles as proof of income when a lender or a landlord asks.
You will need your claim number to get in, the CSA or CSF number OPM assigned when your case was set up. It appears on the correspondence OPM sent at retirement. If you would rather have a statement mailed than downloaded, OPM will send one on request.
Where can I see a statement of my annuity payments?
In OPM Retirement Services Online, under Verification of Annuity. Choose the payment period you want, then save or print it. That statement also serves as proof of income for a lender or landlord. You need your CSA or CSF claim number to sign in, and OPM will mail a statement instead if you ask.
What do you do when a payment does not arrive?
Check the calendar first. A payment that seems late on the first is often just a weekend, a federal holiday, or your bank posting a day behind, and it resolves without anyone doing anything.
If it is genuinely missing, OPM runs a dedicated process for it. You submit a missing payment report online with your claim number and the details of the payment, and OPM confirms by email that the report was received. It usually responds within three to five business days.
OPM asks that you not follow up while it researches. The form has one limit worth knowing in advance: missing refunds and missing lump sum payments cannot be reported through it, and have to go to OPM directly instead.
What should I do if my annuity payment does not arrive?
Rule out the ordinary causes first, since weekends, federal holidays, and slow bank posting explain most of them. If the payment is genuinely missing, file a missing payment report with OPM online using your claim number. OPM emails a confirmation and usually responds within three to five business days, and asks that you not follow up meanwhile.
Can I report a missing lump sum payment the same way?
No. OPM’s online missing payment report covers monthly annuity payments only. A missing refund of retirement contributions, or a missing lump sum payment, has to go through OPM Retirement Services directly instead. There is no online form for either one, so plan on contacting OPM rather than filing a report and waiting.