Last Paycheck to First Retirement Check: Surviving the Cash Flow Gap

Last Updated: April 8, 2026 Reading Time: 8 min

You retire. Your last federal paycheck hits your account on the usual schedule. And then the income stops.

Interim pay from OPM typically takes 30 days or more to start, and it comes in at 60 to 80 percent of your estimated annuity. Your first full annuity check could be 3, 6, or even 9 months away. In 2026, with OPM's pending case count at 65,237 claims, that wait is not theoretical for a lot of people. It is their reality.

This post covers what actually happens to your income from the day you separate through the day your full annuity arrives, and how to manage the cash flow gap so you are not blindsided.

Use the FERS Retirement Calculator to estimate your expected monthly annuity before you retire, so you know what 60 to 80 percent of it actually looks like in dollar terms.

Key Takeaways

• There is a real cash flow gap between your last paycheck and your first full annuity check. Plan for it before you retire, not after.
• OPM's 2026 backlog of 65,237 pending claims means complex cases are taking 6 to 9 months for full adjudication. Interim pay covers you at 60 to 80 percent during the wait.
• Your annual leave lump sum arrives one to two pay periods after separation. It is taxable. Set aside 25 to 30 percent for federal and state taxes.
• TSP is not immediately accessible. Agency notification to TSP takes up to 30 to 60 days. Plan for a 6 to 10 week window before funds are available.
• FEHB coverage continues without a gap, but you must pay premiums directly during interim pay. BENEFEDS will send a bill. Set up automatic payments immediately.
• Have 3 to 6 months of expenses in cash before your retirement date. This is not optional in the current environment.

The Gap Nobody Warns You About

Most retirement planning focuses on long-term strategy: your high-3 average, years of service, TSP balance. Almost nobody prepares people for what happens in the first 90 days.

Here is the actual sequence of events:

1. Your last biweekly paycheck arrives on your normal pay schedule.
2. Your annual leave lump sum follows in one to two pay periods.
3. Your agency submits your retirement package to OPM. This can take one to four weeks depending on how organized your HR office is and whether you used the digital ORA system or paper forms.
4. OPM receives your package, confirms your eligibility, and starts interim pay within about 8 days of receipt. At that point, you start receiving 60 to 80 percent of your estimated net annuity each month.
5. OPM works through your case over the following weeks or months.
6. Your case closes. Your full annuity begins. Your first full check includes a retroactive lump-sum deduction for all the insurance premiums that were not withheld during interim pay.

Step 6 is where people get another surprise. That first full annuity check is often smaller than the interim checks were, because OPM collects all the unpaid FEHB, FEGLI, FEDVIP, and FLTCIP premiums from the interim period in one shot.

The gap between step 1 and step 6 is what you need to finance. In 2026, that gap can be substantial.

Interim Pay Explained

Interim pay is OPM's way of getting money to you while your retirement case is being processed. It is not a loan and it does not need to be repaid. It is simply a partial payment based on an estimated annuity calculation.

You will receive 60 to 80 percent of your estimated net annuity. The exact percentage depends on how much information OPM has and how complex your case is. Payment starts within approximately 8 days of OPM confirming your eligibility.

Only federal income tax is withheld from interim pay. Nothing comes out for FEHB premiums, FEGLI premiums, FEDVIP dental and vision, FLTCIP long-term care, or state income taxes.

This is why your interim check may feel larger than you expected. Do not spend the difference. Those premiums are accumulating and will be collected in a lump sum when your full annuity is finalized.

One more thing on taxes: OPM typically does not withhold state income tax during the interim period, even if your state taxes retirement income. If that applies to you, make quarterly estimated payments to your state. Missing those can mean penalties at filing time.

Once your case closes, OPM sends you a full retirement benefits statement, resumes all insurance premium deductions, and settles the retroactive premium balance from your first full check.

Annual Leave Lump Sum: Your First Income Bridge

When you retire, you receive a lump-sum payment for all unused annual leave, up to a maximum of 448 hours for most employees (240 carryover maximum plus leave accrued in your final leave year).

Most retirees receive the lump sum within one to two pay periods after separation. It comes from your payroll system, not OPM, so it is on a different timeline from your annuity.

The calculation is your hourly rate at separation multiplied by unused leave hours. A GS-14 Step 10 at $165,000 per year with 448 hours of unused leave would receive roughly $35,500.

That check is fully taxable as ordinary income in the year you receive it. Federal withholding is typically at the 22 percent supplemental rate. State income tax and FICA taxes usually apply too.

Spend the whole thing and you may face a significant tax bill in April. Set aside 25 to 30 percent immediately and treat the rest as your bridge.

Timing your retirement date to the end of a pay period on the last day of the month maximizes your accrued leave credit and brings your first interim payment closer. See the best dates to retire in 2026 for specific date options.

TSP Access During the Gap

TSP can bridge income shortfalls during the gap, but you cannot reach it right away after separating.

Here is the sequence:

1. Your agency notifies TSP of your separation. This typically takes up to 30 days. Some agencies take 6 to 8 weeks.
2. TSP updates its records to reflect your separated status.
3. You submit a withdrawal request. Processing takes about 10 additional business days.

Count on 6 to 10 weeks before your first TSP distribution arrives after your last day. With a slow agency notification, that window can stretch to 12 weeks.

Outstanding TSP loans: If you have an open TSP loan at separation, you have 90 days to repay it. After that deadline, the remaining balance becomes a taxable distribution. If you are under age 59.5 at separation, add a 10 percent early withdrawal penalty on top of income taxes. Do not ignore an open loan.

Two penalty-free options matter here:

• Rule of 55: Separate from federal service in the calendar year you turn 55 or older and you avoid the 10 percent early withdrawal penalty. You still owe income taxes on every traditional TSP dollar.
• Under age 55: IRS Section 72(t) installment payments based on life expectancy tables allow penalty-free access if maintained for at least 5 years or until age 59.5, whichever comes later. See the TSP withdrawal guide for how this works in practice.

When you do request a withdrawal, take only what you need as a partial withdrawal. That keeps the rest invested and limits your taxable income in year one. The TSP Calculator can help you model different amounts and their tax impact.

FEHB Coverage Continuity

Good news here: your health coverage does not lapse.

If you are eligible to carry FEHB into retirement (continuously enrolled for the 5 years before retirement, or since your first opportunity to enroll), your coverage transfers from your agency to OPM on your retirement date. There is no gap in coverage.

The catch is how the premiums are handled during interim pay.

OPM cannot deduct FEHB premiums from interim payments. That means your health insurance is technically continuing without interruption, but you need to pay for it out of pocket until your full annuity begins. OPM will send you a letter explaining the direct billing process.

What to do: Contact BENEFEDS (1-877-888-3337 or benefeds.gov) as soon as you receive OPM's letter. Log in to your My BENEFEDS account and set up automatic bank withdrawals. Do not wait. If you miss direct bill payments, BENEFEDS can cancel your coverage.

Once your full annuity is finalized, BENEFEDS collects any past-due premiums through double deductions from your annuity payments until the balance is clear. You will see this reflected in your first full annuity check.

In retirement, FEHB premiums are deducted post-tax from your annuity. During active employment, those premiums come out pre-tax. That difference is real money. A plan costing $400 per month pre-tax has a higher effective cost in retirement depending on your marginal rate.

FEDVIP dental and vision: The same direct billing situation applies. BENEFEDS will send a separate bill for FEDVIP premiums during interim pay. Log in to your My BENEFEDS account and set up auto-pay for those premiums as well.

How to Budget the Gap Month by Month

Here is a realistic cash flow picture for a GS-13 Step 10 employee retiring April 30, 2026, with 240 hours of unused annual leave and a projected full annuity of $5,200 per month net.

Month	Income Source	Estimated Amount	Notes
May	Annual leave lump sum	~$13,800 gross	Set aside ~$3,800 for taxes
May	First interim payment	~$3,600 (70% of $5,200 net)	Arrives mid-month if OPM receives package promptly
June	Interim pay	~$3,600	No insurance deductions
July	Interim pay	~$3,600	FEHB/FEDVIP paid directly from checking
Aug-Oct	Interim pay continues	~$3,600/month	If backlog delay, this may run 6-9 months
Month TBD	First full annuity check	~$4,700	Full net annuity minus retroactive premium collection

A few variables change this picture significantly. A larger leave balance means a stronger bridge. A digital application with no complications can close in 60 to 90 days. A case with a military buyback, multiple agencies, or a survivor benefit election can run 6 to 9 months.

During the gap, you are also paying out of pocket for FEHB premiums, FEDVIP dental and vision, FLTCIP long-term care premiums if enrolled, and state income taxes if your state taxes retirement income and OPM does not withhold for your state. Factor all of those into your monthly cash need.

A 3 to 6 month cash reserve on top of the leave payout and interim pay keeps you out of trouble. The employees who get squeezed during the gap are usually the ones who planned around their full net annuity from day one and forgot about the 60 to 80 percent reality.

OPM Backlog Reality in 2026

The 65,237 pending claims in OPM's retirement processing queue as of February 2026 are not a distant abstraction. The backlog grew by more than 13,000 cases in February alone. OPM received 31,240 new claims that month and processed only 18,149.

Metric	Value
Pending claims (Feb 2026)	65,237
Growth since Oct 2025	+88%
New claims, Feb 2026	31,240
Claims processed, Feb 2026	18,149
Average processing (digital)	34 days
Average processing (paper)	95 days
Real-world wait, complex cases	6 to 9 months

The 34-day digital average looks reasonable until you realize it includes simple cases that close in two weeks and pull the number down. If your case has any wrinkle, a military service credit buyback, records from multiple agencies, a survivor benefit election, or a missing document, you are in the longer tail.

A few things that genuinely help:

• File digitally through the ORA portal. Digital averages 34 days versus 95 for paper.
• Submit a complete package. Missing documents cause returns and restart the clock.
• Hold onto your CSA number and check status at servicesonline.opm.gov.
• Verify your service computation date on your SF-50 before you retire. Errors in your SCD cost weeks.
• Plan financially for the long end. If your full annuity arrives in 60 days, great. If it takes 7 months, you should be fine either way.

For the full backlog picture and what drives processing times, see OPM retirement processing times 2026.

Calculate Your FERS Annuity Before You Retire

Before you can plan the gap, you need a solid annuity estimate in actual dollars. Use the free FERS Retirement Calculator to get your monthly annuity figure based on years of service, high-3 salary average, and retirement date. Then multiply that number by 0.6 and 0.8. That range is what interim pay actually looks like for you.

If you are not sure of your high-3 average, run it through the High-3 Calculator first.

Frequently Asked Questions

How long between my last federal paycheck and my first annuity check?

Your last federal paycheck comes on your normal pay schedule. Interim pay from OPM typically starts within 30 days of OPM receiving your application. Your first full annuity check averages 34 days for digital applications and 95 days for paper, but with OPM's current backlog of 65,237 pending claims, complex cases are running 6 to 9 months in 2026.

What is interim pay and how much will I receive?

Interim pay is a partial annuity payment OPM issues while processing your full retirement case. It equals approximately 60 to 80 percent of your estimated net annuity. Only federal income tax is withheld from interim pay. No FEHB, FEGLI, FEDVIP, FLTCIP, or state income tax deductions come out during this period.

When does the annual leave lump sum arrive after retirement?

Most retiring federal employees receive their lump-sum annual leave payment within one to two pay periods after their separation date. The check is taxable as ordinary income, with federal withholding typically at the 22 percent supplemental rate. Set aside 25 to 30 percent for taxes and treat the rest as your income bridge during the OPM processing period.

Can I withdraw from TSP right after I retire?

Not immediately. Your agency must notify TSP of your separation, which takes up to 30 days. Some agencies take 6 to 8 weeks. After TSP receives the separation notice, withdrawals take about 10 additional days to process. Plan for a window of 6 to 10 weeks before you can access TSP funds after your last day.

Does FEHB coverage lapse during the OPM processing gap?

No. If you are eligible to carry FEHB into retirement, your coverage continues without any gap. However, FEHB premiums cannot be deducted from interim pay, so you must pay them directly. OPM will send you a letter with instructions. Contact BENEFEDS to set up automatic bank withdrawals so your coverage is not canceled.

What happens to my dental and vision insurance during the gap?

FEDVIP dental and vision premiums are not deducted during interim pay. BENEFEDS will send you a direct bill. Log in to your My BENEFEDS account to set up automatic bank withdrawals right away. If you miss payments, coverage can be canceled. When your full annuity begins, BENEFEDS collects any past-due premiums through double deductions.

Related Resources

• First Year of Federal Retirement: A Month-by-Month Guide: The broader picture of your first 12 months as a federal retiree, including FERS Supplement, Medicare decisions, and the 5 costliest mistakes
• OPM Retirement Processing Times 2026: Full backlog data, digital vs. paper comparison, and what drives case complexity
• TSP Withdrawal Guide 2026: All TSP withdrawal options after separation, including installments, partial withdrawals, and RMDs
• Best Dates to Retire in 2026: How to time your retirement date to maximize your leave payout and minimize the income gap
• FERS Retirement Calculator: Estimate your monthly annuity based on your service years, high-3, and retirement date

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Sources: OPM Retirement Processing Times (February 2026 data); OPM Interim Pay FAQ; OPM Annuity Payments; OPM Lump-Sum Payments for Annual Leave; BENEFEDS Retirement Transition; TSP Withdrawals in Retirement; FedWeek: Retirement Backlog Builds; FedSmith: OPM Backlog February 2026.