OPM Interim Payments: Duration, Deductions, and Retroactive Pay

OPM interim retirement payments are reduced estimates, usually 60 to 80 percent of your projected final annuity, that the Office of Personnel Management sends while it verifies your service record and calculates your permanent benefit. OPM typically authorizes the first interim payment about eight days after your former agency delivers a complete retirement package, and payments then arrive on the first business day of each month until your case is finalized.¹ Two things about this phase catch retirees off guard: the gross payment is lower than your final annuity, but the net looks higher than it should because most deductions are suspended.

Why the Estimate Runs 60 to 80 Percent

OPM builds the interim figure from what your initial application shows: your high-three average salary and your years of creditable service. It then trims that gross estimate by 20 to 40 percent before issuing your first check. The result is the 60 to 80 percent range most retirees see, described in OPM’s Quick Guide as “approximately 60–80% of your finalized net payment for most people.”

The haircut is deliberate. At this stage OPM has not yet verified military service buybacks, part-time service adjustments, unused sick leave credits, or periods of leave without pay. Each of those requires line-by-line review. Keeping the estimate conservative protects you from an overpayment that OPM would later have to claw back. Unusually complex service histories can fall outside the 60–80 percent range in either direction.

What Interim Checks Leave Out

Part of the gap between your interim payment and your final annuity comes from components that simply aren’t included yet.

The FERS annuity supplement. If you retire before 62 under FERS and qualify for the supplement, OPM does not pay it during interim. It begins after final adjudication, with a retroactive amount covering the months you missed.
Cost-of-living adjustments. A COLA that takes effect while your claim is being processed does not appear in interim checks. It’s folded into your retroactive settlement.
Your lump-sum payout for unused annual leave. That comes from your former agency, not OPM, and arrives separately in or around your final paycheck.

Deductions That Get Paused

During the interim phase, OPM withholds only federal income tax. Everything else is deferred until your case is fully adjudicated.² That means your interim net looks larger relative to gross than your final net will.

Suspended deductions include:

Federal Employees Health Benefits (FEHB) premiums. Coverage stays active, but premiums accumulate and are collected retroactively once the annuity is finalized.³
Federal Employees’ Group Life Insurance (FEGLI) premiums. Same treatment: coverage continues, payment defers.
Federal Employees Dental and Vision Insurance (FEDVIP) premiums. Not deducted during interim.⁴
Federal Long Term Care Insurance Program (FLTCIP) premiums. FLTCIP cannot deduct from an interim annuity, so it sends direct bills to your home address. Automatic deductions resume after finalization if your annuity is large enough to cover them. Watch the mail; missed FLTCIP bills can affect coverage.⁵
Survivor benefit reduction. Under FERS, a full survivor benefit reduces your annuity by 10 percent; a partial election (25 percent of your unreduced annuity to your survivor) costs 5 percent. Neither reduction is applied during interim.

The practical warning: every month you spend on interim pay, those premiums and reductions are stacking up. When OPM finalizes your case, all of them come out of your retroactive payment in one pass. If you treat the interim net as your permanent income, the transition to your final check can hurt. Set aside roughly what you expect those premiums to total each month.

Tax Withholding During Interim

If you don’t submit a specific request, OPM’s default federal tax withholding is single with zero allowances.⁶ That’s more aggressive than many retirees expect and may not match your actual filing situation.

State income tax is not withheld unless you elect it. Through OPM’s Services Online portal, you can change both federal and state withholding while you’re still in interim status.⁷ If you live in a state that taxes retirement income and don’t set up withholding, the full state tax comes due at filing.

The retroactive lump sum that arrives after adjudication is taxable as ordinary income in the year you receive it. A large payment can push you into a higher marginal bracket or trigger estimated-tax obligations. The IRS generally requires estimated payments if you expect to owe at least $1,000 after withholding and credits.⁸ If a substantial retroactive payment arrives midyear and your withholding hasn’t been adjusted, an estimated payment can help you avoid an underpayment penalty.

How Long Interim Pay Lasts

The first interim payment lands quickly, roughly eight days after OPM receives a complete package from your former agency.¹ Final adjudication takes much longer. As of early 2026, OPM’s overall processing time averages about 77 days, but the filing method matters: retirees who filed through the Online Retirement Application are seeing roughly 40 days, while paper filers are waiting around 90 days or more. OPM’s Quick Guide estimates three to five months in typical cases. Complex situations, including military service deposits, court orders, or errors in the retirement package, take longer.

Interim payments come on the first business day of each month.⁹ If you retired mid-month, expect your first payment to be prorated.

Final Adjudication and the Retroactive Payment

Once OPM finishes reviewing your full record, it calculates your exact monthly annuity and compares what you should have received since your retirement date against what interim actually paid. The difference is issued as a one-time retroactive payment. That deposit covers the annuity shortfall, your FERS supplement if you’re entitled to one, and any COLA that took effect during processing.

It’s not a pure windfall. OPM deducts every premium that was deferred during interim, along with any applicable survivor reduction, all retroactive to the start of your annuity.³ Your net retroactive deposit is the annuity gap minus those accumulated charges.

With this payment, OPM sends a detailed annuity booklet known as the Blue Book. It lays out your biographical information, your CSA claim number, the high-three average salary used in the calculation, your total creditable service, your gross and net monthly benefit, survivor elections and their cost, FEGLI details, and the full retroactive computation. Review it as soon as it arrives. If your high-three salary or service computation date is wrong, the Blue Book is where you catch it, and early corrections are far easier than fixing an error discovered years later. After the adjustment, your annuity moves to the regular monthly schedule.

If a Court Order Divides Your Pension

A court order dividing your pension with a former spouse does not affect your interim payments. During interim you receive the full amount without apportionment. The former spouse’s share begins only after OPM finalizes your case and the former spouse submits a separate written application with a certified copy of the order.¹⁰

The tradeoff is time. OPM’s Court Order Benefits Branch reviews the decree before finalizing your case, which can significantly extend adjudication.⁴ Plan for a longer interim period and budget with that in mind. The FERS supplement is included in the former spouse’s apportionment unless the court order specifically excludes it.¹⁰

What to Do While You Wait

A few practical steps make the interim phase less disruptive:

Log into Services Online early and adjust federal and state tax withholding if the defaults don’t fit your situation.⁷
Set aside cash each month for the FEHB, FEGLI, FEDVIP, and survivor deductions that are quietly accumulating. When they hit your retroactive check, they can eat most of the annuity gap.
Watch for FLTCIP direct bills at your home address and pay them on time.⁵
Plan for the tax impact of the retroactive lump sum. If it lands late in the year, consider an estimated tax payment.⁸
Read the Blue Book carefully as soon as it arrives and verify the high-three salary, service computation date, and years of creditable service.

1
U.S. Office of Personnel Management. Retirement Processing Times
2
U.S. Office of Personnel Management. Are Any Deductions Withheld From My Interim Payments?
3
U.S. Office of Personnel Management. Interim Pay During Retirement Processing
4
U.S. Office of Personnel Management. OPM Retirement Quick Guide
5
Federal Long Term Care Insurance Program. Retirement / Workforce Changes
6
U.S. Office of Personnel Management. Tax Information for Annuitants
7
U.S. Office of Personnel Management. I’m in Interim Pay – What Can I Do on Services Online?
8
Internal Revenue Service. Publication 575 – Pension and Annuity Income
9
U.S. Office of Personnel Management. Annuity Payments
10
U.S. Office of Personnel Management. Court-Ordered Benefits