Medicare and TRICARE for Life: What Military Retirees Need to Know

TRICARE for Life is one of the best supplemental coverage deals in the country — but only if you keep Medicare Part B. Drop Part B and you lose TRICARE for Life permanently, with no special re-enrollment right. Military retirees also face a distinct IRMAA risk: pension income is fully taxable, TSP distributions stack on top, and the two-year look-back means decisions made before age 65 determine premiums two years into retirement.

How TRICARE for Life actually works

TRICARE for Life is Medicare wraparound coverage. The payment sequence for any Medicare-covered service is:²

1. Medicare pays first — Part A for inpatient, Part B for outpatient. Medicare's cost-sharing rules apply (deductibles, 20% coinsurance, etc.).
2. TRICARE pays second — covers what Medicare leaves behind. For services both programs cover, TRICARE picks up the Medicare deductibles and coinsurance.
3. Your out-of-pocket: typically $0 — for services covered by both Medicare and TRICARE, most beneficiaries pay nothing beyond the Part B premium.

This is better protection than standard Medigap Plan G for most services. Plan G requires a $590 annual Part B deductible before full coverage kicks in (2026). TFL has no separate annual deductible for services Medicare covers first.

TRICARE for Life vs. Medigap: which is better?

For military retirees with TFL, adding a Medigap policy is almost never worthwhile. Here's the comparison:²

The bottom line: TFL is a near-equivalent of Plan G with no additional premium and superior pharmacy coverage. The one meaningful gap is that TFL requires Medicare assignment — if you see a provider who doesn't accept Medicare assignment and charges more than Medicare's approved amount (a "Part B excess charge"), TFL won't cover the difference. Plan G does. In practice, over 97% of physicians accept Medicare assignment, so this rarely matters for most retirees.

Pharmacy: do you need Medicare Part D?

No. TRICARE pharmacy is creditable prescription drug coverage — it meets or exceeds Medicare Part D standards. As a TFL beneficiary, you:³

• Can fill prescriptions at Military Treatment Facilities (MTFs) at no cost for many medications
• Can use TRICARE Mail Order Pharmacy (TMOP) at low cost for maintenance drugs
• Can use TRICARE-network retail pharmacies with standard cost-shares
• Are not required to enroll in Medicare Part D to maintain TRICARE for Life
• Will not pay a Part D late enrollment penalty if you later choose to enroll in Part D, because TRICARE is creditable coverage

Most TFL beneficiaries are better off staying with TRICARE pharmacy than adding Part D. The exception: if you take a drug not on the TRICARE Uniform Formulary and find a Part D plan with better coverage or lower cost-share for that specific medication.

The IRMAA problem for military retirees

TRICARE for Life solves the Medigap premium problem for military retirees — but it doesn't solve IRMAA. The Part B premium you pay is income-based, and military retirement pay counts fully toward IRMAA MAGI.

IRMAA MAGI = AGI (Form 1040, Line 11) + tax-exempt interest (Line 2a). Military retirement pay is ordinary income, fully taxable at the federal level, and flows directly into AGI.⁴ Disability retirement pay is partially or fully excluded only if based on a service-connected disability — standard retirement pay gets no exclusion.

At 20 years active duty at the O-6 or E-9 level, military retirement pay alone can approach or exceed the first IRMAA threshold:

The stacking problem: Pension income is fixed and can't be reduced. Social Security benefits add to it (85% taxable at these income levels). TSP traditional distributions stack on both. The typical O-5/O-6 retiree at age 73 faces:

For a married O-6 retiree where both spouses have Medicare, both pay IRMAA based on the combined joint MAGI. A $116,100 MAGI on a joint return is still below the $218,000 MFJ threshold — but if both spouses have pensions, or if TSP balances are larger, joint MAGI climbs quickly.

2026 IRMAA surcharge tiers

IRMAA is based on your 2024 MAGI (two-year look-back). The surcharges apply to the Part B premium every TFL beneficiary pays:⁵

Note: both spouses pay their own Part B premium based on combined MAGI. A married couple where MAGI is $280,000 MFJ each pays $405.80/month — $9,739/year combined — rather than $4,869 at the base rate.

Five IRMAA strategies for military retirees

Pension income is fixed. The controllable variables are TSP distributions, Social Security timing, and any investments in taxable accounts.

1. Roth conversions before age 65 and before TSP RMDs begin

The most powerful window is the period after military retirement and before age 65 when TSP RMDs start at 73 (born 1951–1959) or 75 (born 1960+). If you retired at 45–55, there may be a 15–25 year window where pension income alone keeps MAGI manageable.

During that window, converting traditional TSP or traditional IRA balances to Roth (paying tax now at lower rates) reduces the future RMD mass that will otherwise generate mandatory taxable income every year after 73. The Roth TSP itself generates no IRMAA MAGI — distributions are tax-free. SECURE 2.0 § 325 also eliminated Roth 401(k)/TSP lifetime RMDs starting 2024, so Roth TSP balances can grow indefinitely without forced distributions.

Caution: the year of conversion itself counts toward MAGI. Convert $30,000 and that $30,000 appears in IRMAA MAGI two years later. Model your conversions against the IRMAA tier cliffs — a conversion that keeps you just below $109,000 (single) or $218,000 (MFJ) is better than one that pushes you over.

2. Roll TSP to an IRA to enable qualified charitable distributions

TSP does not permit qualified charitable distributions (QCDs). IRAs do. QCDs allow you to direct up to $111,000 per person per year in 2026 directly to a qualified charity from your IRA, satisfying your RMD without the distribution ever entering AGI.⁶

If your traditional TSP balance is large and you're 70½ or older, rolling it to a traditional IRA at retirement (or before RMDs begin) gives you QCD access. The rollover itself is not a taxable event. Then each year you can use QCDs to offset some or all of the RMD — removing that income from MAGI entirely.

Example: TSP rolled to IRA, now $500,000. Age-73 RMD = ~$19,000. You direct $10,000 to a charity as a QCD — that $10,000 satisfies $10,000 of the RMD and never appears in AGI. The remaining $9,000 regular distribution does. Net MAGI effect: $9,000 instead of $19,000 from this account.

3. Time Social Security to manage the stacking problem

Delaying Social Security to age 70 maximizes your benefit but also maximizes the MAGI impact when benefits begin. The two-year look-back means benefits starting in 2024 affect 2026 premiums. If your first year of SS plus pension puts you over an IRMAA tier cliff, you can file an SSA-44 Life Changing Event appeal if a qualifying event (retirement) also occurred that year and reduced income.

In the opposite direction: taking SS at 62 or 65 generates smaller benefits, but if your total MAGI trajectory (pension + SS + TSP RMDs) will inevitably place you well into Tier 1 or Tier 2 regardless, the marginal IRMAA cost of SS timing is small. A specialist can model the break-even across total after-tax lifetime income including IRMAA.

4. SSA-44 appeal for the retirement year

The year you retire from the military, your MAGI may be unusually high — a full year of taxable military pay before retirement date, plus any accumulated leave payout, VSP/SSB separation pay, or other one-time income. That elevated year feeds into Medicare premiums two years later via the look-back.

If your actual retirement income (pension only) is substantially lower, you can appeal using SSA Form SSA-44. Retirement from work qualifies as a "life-changing event." SSA will use your current-year estimated income instead of the two-year-old elevated income. For a military retiree whose high-income working year triggers Tier 2 or Tier 3 IRMAA, this appeal can save $1,736–$4,619/year per person.

5. Capital gain and investment income timing

If you have taxable brokerage accounts, capital gains and dividends stack on top of pension, SS, and TSP distributions. When pension income already keeps you near an IRMAA threshold, a large gain realization can be the marginal push over a tier cliff. Spreading realizations across years, harvesting losses to offset gains, or deferring taxable events to years with more headroom reduces IRMAA exposure from the one controllable variable in the income stack.

VA health care: a separate system

Veterans who also have VA health care eligibility can use all three systems — Medicare, TRICARE for Life, and VA — but they do not integrate the way most people expect:⁷

• VA and Medicare/TFL are completely separate. VA benefits do not coordinate with Medicare or TRICARE for Life. VA pays for care provided at VA facilities; Medicare/TFL pay for care at Medicare-participating facilities. Neither system covers the other's cost-sharing.
• If you use VA care, Medicare and TFL have no role — they won't cover VA copays and the VA won't reimburse Medicare/TFL cost-shares.
• If you use Medicare-participating providers, Medicare pays first and TFL wraps around it, as described above. VA benefits are irrelevant for that encounter.
• You choose which system to use each time. Many veterans with service-connected conditions use VA for those specific needs (often at no cost) and Medicare/TFL for other health care, preserving the best of both systems.

The key implication for IRMAA: having VA benefits doesn't reduce your Part B premium or IRMAA obligation. If your income is above the IRMAA threshold, you pay the surcharge regardless of how much care you actually get through VA.

The Part B late enrollment penalty trap

Some military retirees delay enrolling in Medicare Part B at 65 under the mistaken belief that TRICARE alone is sufficient. It is not. TRICARE coverage for retirees depends on active Medicare Part B enrollment.¹

The consequences of skipping Part B:

• You lose TRICARE for Life coverage until you re-enroll in Part B
• Re-enrollment requires waiting for the January–March General Enrollment Period (Part B effective July 1)
• You pay a 10% permanent penalty on your Part B premium for each 12-month period you were eligible but not enrolled — for life
• Example: miss three years of Part B → pay a permanent 30% surcharge on top of the standard premium and any IRMAA. At today's base $202.90 rate, that's an extra $60.87/month ($730/year) forever — plus the IRMAA surcharge above that

If you're near 65 and TRICARE-eligible as a retiree: enroll in Medicare Part B during your Initial Enrollment Period, no later than 2 months before your 65th birthday, to maintain TFL continuity without penalty.

CHAMPVA: a brief note

CHAMPVA (Civilian Health and Medical Program of the Department of Veterans Affairs) is a separate program for the dependents — spouses and children — of veterans who are:

• Rated permanently and totally disabled (100% P&T) by the VA for a service-connected condition, or
• Were rated P&T at the time of death, or died from a service-connected disability, or
• Died in the line of duty

CHAMPVA is distinct from TRICARE. A veteran who is a military retiree (20+ years service) has TRICARE; their eligible dependents have TRICARE too. A veteran who was medically separated (not retirement-eligible by years of service) may not have TRICARE, but if rated 100% P&T, their dependents may qualify for CHAMPVA.

For CHAMPVA beneficiaries who become Medicare-eligible at 65, Medicare becomes primary and CHAMPVA wraps around it — similar in concept to TFL, but through a different administrative program.

Decision framework for military retirees approaching 65

Sources

1. TRICARE: Becoming Medicare-Eligible — Official TRICARE guidance on the Part A and Part B enrollment requirement for TFL. Beneficiaries who do not enroll in Part B lose TRICARE coverage; late enrollment triggers the standard Medicare Part B late enrollment penalty (10% per 12-month period, permanent).
2. TRICARE: TRICARE for Life — How TFL works as Medicare wraparound coverage. Payment sequence (Medicare first, TFL second), $0 cost-sharing for dual-covered services, cost matrix for 2026. No TFL enrollment fee; beneficiary pays Part B premium only.
3. TRICARE: If I have Medicare and TRICARE, do I need Medicare Part D? — TRICARE pharmacy is creditable prescription drug coverage. TFL beneficiaries do not need Part D and will not face late enrollment penalties if they enroll in Part D later.
4. IRS Publication 525: Taxable and Nontaxable Income — Military retirement pay is ordinary taxable income at the federal level. Disability retirement pay from a service-connected disability may be excluded (IRC § 104); standard retirement pay is not excluded.
5. CMS: 2026 Medicare Part B Premium and IRMAA Information — 2026 IRMAA surcharge tiers by MAGI bracket (single and MFJ), based on 2024 MAGI. Standard Part B premium $202.90/month. Verified November 2025.
6. IRS Notice 2025-67: 2026 Retirement Plan Contribution Limits — QCD limit for 2026: $111,000 per person (indexed annually under SECURE 2.0 § 307). QCDs must be made from IRAs (traditional, Roth, SEP, SIMPLE if inactive for ≥2 years) — TSP and 401(k) plans do not support QCDs directly. TSP-to-IRA rollover required to access QCD strategy.
7. NCOA: How Does Medicare Work with VA Benefits and TRICARE for Life? — VA health care and Medicare/TRICARE for Life do not coordinate. Each system operates independently; beneficiaries choose which to use per encounter. VA does not cover Medicare/TFL cost-shares and vice versa.

Values verified as of May 2026. IRMAA brackets set annually by CMS; TRICARE for Life rules per TRICARE.mil. Consult a licensed advisor for guidance specific to your situation.