PSHB for Postal Employees 2026: Medicare Part B Requirement, IRMAA Planning, and What Changed from FEHB

If you are a USPS employee or postal annuitant, your health coverage changed significantly on January 1, 2025. The Postal Service Health Benefits program replaced FEHB for all postal workers — and it brings a new Medicare Part B enrollment requirement that can trigger substantial cost consequences if you miss the enrollment window. Your TSP and FERS pension are unchanged, but TSP withdrawal decisions now interact with your PSHB premiums through IRMAA in ways you need to plan around.

What PSHB is — and why it replaced FEHB for postal workers

The Postal Service Health Benefits program was created by the Postal Service Reform Act of 2022 (PL 117-108) and became effective January 1, 2025. It covers approximately 1.9 million United States Postal Service employees, postal annuitants, and their eligible family members.¹

PSHB is administered by OPM — the same office that runs FEHB — but it is legally a separate program with its own carrier contracts, plan options, and enrollment rules. As of January 1, 2025, USPS employees and postal annuitants are no longer eligible to enroll in FEHB. PSHB is the only OPM-administered health benefit available to them.

The primary reason Congress created PSHB was to reduce long-term costs by requiring new postal retirees to coordinate their coverage with Medicare. USPS had accumulated enormous retiree health benefit liabilities in part because postal retirees historically chose to stay in FEHB without enrolling in Medicare Part B. The mandatory Medicare coordination requirement is the central policy mechanism of PSHB.

How PSHB differs from FEHB

The 5-year rule: qualifying to carry PSHB into retirement

Like FEHB, PSHB requires enrollment for the 5 years immediately before retirement to carry coverage into retirement as an annuitant. The critical provision: time spent in FEHB counts toward the 5-year PSHB requirement.² A postal employee who was in FEHB for 4 years before PSHB launched in January 2025 and then enrolled in PSHB for 1 year before retiring has satisfied the 5-year rule.

This transition rule means most long-tenured USPS employees are unaffected by the 5-year requirement — they already have decades of FEHB coverage in their history. The 5-year rule is a practical concern primarily for newer USPS employees or those who had significant breaks in enrollment.

The Medicare Part B requirement: the most important change for postal retirees

This is the provision with the largest practical impact on retirement planning for postal employees. Under PSHB, most postal annuitants who become eligible for Medicare after January 1, 2025 must enroll in Medicare Part B as a condition of maintaining PSHB enrollment.¹

Who must enroll in Medicare Part B

If you are a USPS employee who retires after January 1, 2025 and subsequently becomes Medicare-eligible (generally at age 65), you and your Medicare-eligible covered family members must enroll in Part B to remain enrolled in PSHB. This is a condition of continued PSHB eligibility — not a recommendation.

Who is grandfathered (not required to enroll in Part B)

Two groups are exempt from the mandatory Part B enrollment requirement:¹

• Postal annuitants who retired on or before January 1, 2025 and are not already enrolled in Medicare Part B are not required to enroll in Part B to maintain PSHB coverage. Their existing PSHB enrollment continues without the Part B mandate.
• USPS employees who were age 64 or older on January 1, 2025 — these employees, when they retire, are not required to enroll in Medicare Part B to remain in PSHB as an annuitant. Their eligible family members are also not required to enroll.

The enrollment window and late enrollment penalty

Medicare Part B enrollment is time-sensitive. Your Initial Enrollment Period (IEP) runs for 7 months centered on your 65th birthday: 3 months before the month you turn 65, the birthday month itself, and 3 months after. If you miss the IEP without a qualifying Special Enrollment Period, you face:

• A permanent late enrollment penalty of 10% per 12-month period you were eligible but not enrolled
• A delay in coverage starting — enrollment in the General Enrollment Period (January–March) doesn't begin coverage until July 1

OPM coordinates a Special Enrollment Period for PSHB enrollees similar to FEHB, allowing PSHB participants who delayed Part B enrollment to enroll without the late penalty under specific circumstances. However, this SEP is not automatic — it requires documentation and coordination with OPM. Do not assume the SEP will apply; verify your enrollment window with SSA and OPM before your 65th birthday.

2026 PSHB premium costs

For 2026, PSHB enrollee premiums increased by an average of 11.3%, compared to 12.3% for FEHB.³ As with FEHB, the government pays approximately 72% of the weighted average premium. Your share of the premium is deducted from your paycheck while employed and from your FERS annuity after retirement.

When you add Medicare Part B for required enrollees, the combined cost in 2026 is:

Some PSHB plans partially offset the Part B requirement by reimbursing a portion of the Part B premium. GEHA's PSHB plans, for example, offered approximately $800/year in Part B premium reimbursement for enrolled annuitants in 2026.⁴ When evaluating total PSHB cost, compare the plan's premiums plus coordination benefits against the plan you held as an employee — the calculus changes at retirement when Medicare Part B becomes primary.

Why enrolling in Part B usually pays off for PSHB retirees

When Medicare Part B is active, it becomes the primary payer for most outpatient services. PSHB then pays as secondary. Most PSHB plans significantly reduce or eliminate cost-sharing (copays, coinsurance, deductibles) for covered services when Medicare pays primary. The result: PSHB + Part B enrollees typically have near-zero out-of-pocket costs for most medical care.

The break-even analysis typically favors enrolling in Part B for postal retirees who:

• See multiple providers or specialists per year
• Have one or more chronic conditions requiring ongoing management
• Anticipate hospitalizations or outpatient procedures
• Have spouses who also need coverage

The main scenario where Part B may not pay off: a very healthy retiree with minimal medical utilization who lives in an area with strong PSHB plan options. Even then, the mandatory nature of Part B for most post-2025 PSHB retirees means this is less a choice and more a compliance requirement. The benefit of the mandate is that you get coordinated coverage by default.

IRMAA: how your TSP withdrawals affect PSHB costs

Once you're enrolled in Medicare Part B, the size of your TSP withdrawals directly affects what you pay in Part B premiums through IRMAA — the Income-Related Monthly Adjustment Amount.

IRMAA is assessed on Medicare enrollees whose modified adjusted gross income (MAGI) exceeds income thresholds. For 2026:⁵

• Base premium: $202.90/month at MAGI ≤ $109,000 (single) / ≤ $218,000 (MFJ)
• IRMAA Tier 1: $284.10/month at MAGI $109,001–$136,000 (single) / $218,001–$272,000 (MFJ)
• IRMAA Tier 2: $394.80/month at MAGI $136,001–$163,000 (single) / $272,001–$326,000 (MFJ)
• IRMAA Tier 3: $505.50/month at MAGI $163,001–$500,000 (single) / $326,001–$750,000 (MFJ)
• IRMAA Tier 4: $689.90/month at MAGI > $500,000 (single) / > $750,000 (MFJ)

IRMAA uses a two-year lookback: your 2026 Part B premium is based on your 2024 tax return. A large TSP withdrawal, Roth conversion, or one-time income event in 2024 can increase your 2026 Part B premium — even if your income normalized in 2025 and 2026.

What counts as MAGI for IRMAA purposes

MAGI for IRMAA includes: FERS pension, traditional TSP withdrawals (100% taxable), taxable Social Security (up to 85%), wages, investment income, and Roth conversion income. It does not include qualified Roth TSP or Roth IRA distributions — those are tax-free and not counted.

The Roth conversion window for postal employees

Like all FERS employees, postal workers who retire before 65 have a valuable Roth conversion window — the years between retirement and Medicare eligibility when income is lower and IRMAA doesn't apply yet. For a postal employee who retires at the MRA (Minimum Retirement Age, 56–57 for most FERS employees born after 1969) with immediate eligibility:

• FERS pension begins immediately, FERS Supplement bridges to age 62
• Years 57–64 are the primary Roth conversion window — income typically lowest, no IRMAA exposure
• TSP in-plan Roth conversions have been available since January 28, 2026 (SECURE 2.0 implementation)
• Rolling portions of traditional TSP to a Roth IRA is also an option post-separation
• Converting before Medicare starts avoids the 2-year lookback problem: conversions done at age 62 don't appear in your IRMAA calculation until age 64, before Part B kicks in

For a postal retiree who expects TSP to generate significant RMDs at age 73 or 75, reducing that traditional TSP balance before IRMAA applies can prevent decades of elevated Part B premiums.

FERS and TSP: unchanged for postal employees

PSHB applies only to health benefits. Your FERS pension and TSP account are completely unaffected by the transition from FEHB to PSHB. Everything about the following works identically for USPS employees and non-postal federal employees:

• TSP contribution limits: $24,500 regular / $32,500 catch-up (50+) / $35,750 super catch-up (60–63) in 2026 — same for postal workers
• Agency matching: 1% automatic + dollar-for-dollar on first 3% + 50 cents on next 2% = up to 5% total match — same for postal workers
• FERS pension formula: 1% × High-3 × years of service (1.1% if retiring at 62+ with 20+ years) — same formula
• TSP fund choices: G, F, C, S, I, and Lifecycle funds — same for postal employees
• Rule of 55: penalty-free TSP withdrawals if you separate from USPS in or after the year you turn 55 — same for postal workers (age 50 for special-category employees like Postal Police Officers)
• TSP rollover decisions: same stay-vs-rollover tradeoffs apply (G Fund uniqueness, Rule of 55, Roth conversion flexibility)

FEHB survivor annuity and PSHB: what postal employees need to know

The interaction between FERS survivor annuity elections and PSHB health coverage works the same way as FEHB. If a postal retiree elects no survivor annuity, the surviving spouse loses PSHB coverage upon the retiree's death — unless the spouse is independently enrolled as a USPS employee/annuitant. The spouse would then need to find alternative coverage (Medicare + Medigap, or private insurance).

This is an important retirement-planning interaction: postal retirees considering the no-survivor election need to account for their spouse's future PSHB access, especially if the spouse will be dependent on the retiree's enrollment for health coverage. See our detailed FERS Survivor Annuity Election guide for the cost/break-even analysis.

Open Season and mid-year changes

PSHB Open Season runs November–December each year, the same window as FEHB Open Season. During Open Season, postal employees and annuitants can:

• Switch between PSHB plans
• Change coverage tiers (Self Only, Self Plus One, Self and Family)
• Enroll if not currently enrolled (subject to eligibility rules)

Outside Open Season, you can change or enroll only with a Qualifying Life Event (QLE) — marriage, divorce, birth/adoption of a child, loss of other coverage, or a significant change in employment status. The QLE window is 60 days from the event.

Planning checklist for postal employees approaching retirement

1. Verify the 5-year rule. Confirm your FEHB + PSHB enrollment history covers 5 years before your planned retirement date. Pull enrollment records from your HR office or MyFEDS.
2. Know your Medicare Part B obligation. If you were born after 1960 or plan to retire after 2025, you will almost certainly be required to enroll in Part B when you turn 65. Mark your 65th birthday on your retirement planning calendar now.
3. Identify your PSHB plan choice at retirement. The PSHB plan that's best for an active employee (low premium, good network) may not be best for a retiree whose Part B is primary. During Open Season before retirement, evaluate plans for their Medicare coordination benefits — especially Part B reimbursements.
4. Project MAGI at age 65. Add up FERS pension + estimated TSP installments + 85% of SS estimate + any other income. If you're near $109,000 (single) or $218,000 (MFJ), you have an IRMAA management problem worth addressing now through Roth conversions before Medicare starts.
5. Model the Roth conversion window. The years between your FERS retirement (typically 56–62) and Medicare eligibility (65) are your lowest-MAGI, highest-leverage Roth conversion years. Converting during these years reduces future RMDs and future IRMAA exposure simultaneously.
6. Coordinate TSP withdrawal timing with IRMAA lookback. Large TSP withdrawals in the year you turn 63 affect your 2026 Part B premium (2-year lookback). Plan unusual withdrawals with the lookback in mind.
7. Consider the survivor PSHB trap. If you elect no survivor annuity, your spouse loses PSHB access after your death. Factor this into the survivor annuity decision.

What a fee-only advisor models for postal employees

The interaction between PSHB, mandatory Medicare Part B, TSP withdrawal timing, IRMAA, FERS pension, and Roth conversion strategy is genuinely complex — more complex than the same analysis for non-postal federal employees, because the Part B mandate removes the "optional" nature of Medicare coordination and makes IRMAA management unavoidable.

A specialist who works with FERS employees builds this as one integrated model:

• MAGI projection from retirement to age 90: FERS pension, FERS Supplement (to 62), Social Security, TSP installments/RMDs, Roth conversion income — year by year
• Optimal Roth conversion amounts by year to stay under (or consciously cross) IRMAA tiers given the lifetime tax benefit
• TSP in-plan Roth conversion vs. rollover-and-convert strategy — which gives better IRMAA-bracket sizing control after the Jan 2026 in-plan option launch
• PSHB plan selection at retirement vs. during active service — Medicare coordination benefit comparison
• Survivor PSHB planning coordinated with survivor annuity election and life insurance review

1. PSHB created by Postal Service Reform Act of 2022 (PL 117-108); effective January 1, 2025; covers ~1.9 million USPS employees, annuitants, and family members; Medicare Part B required for post-Jan 1, 2025 retirees; grandfathered exception for annuitants retired by Jan 1, 2025 and employees age 64+ on Jan 1, 2025: OPM — Postal Service Health Benefits Program; OPM — PSHB Medicare Cost Savings.
2. PSHB 5-year rule same as FEHB; time enrolled in FEHB counts toward PSHB 5-year requirement per 5 U.S.C. §8903c(d): Federal Register — Establishment of the PSHB Program (April 6, 2023); NARFE — PSHB Questions and Answers.
3. 2026 PSHB average enrollee premium increase 11.3% vs. FEHB 12.3%: NARFE New York — 2026 FEHB and PSHB Premiums; ClearanceJobs — OPM Confirms 2026 Health Plan Costs.
4. GEHA PSHB plans offer ~$800/year Medicare Part B premium reimbursement for eligible enrolled annuitants: GEHA — Medicare and PSHB Health Plans; OPM — PSHB Medicare Cost Savings examples.
5. 2026 Medicare Part B standard monthly premium $202.90 (up from $185.00 in 2025); IRMAA thresholds and surcharges per CMS; 2-year lookback rule: CMS — 2026 Medicare Parts A & B Premiums and Deductibles; SSA POMS HI 01101.020 — IRMAA Sliding Scale Tables.
6. PSHB myths vs. facts for 2026, PSHB vs. FEHB comparison: FEBA Benefits — PSHB Myths vs. Facts 2026; FEBA Benefits — PSHB vs. FEHB 2026.

Values verified as of July 2026. PSHB plan options, premiums, and Medicare Part B costs update annually. Verify current-year values at opm.gov and medicare.gov before finalizing enrollment decisions.