Lesson 6 of 15
Avoiding the Medicare late-enrollment penalty
Quick answer
If you do not enroll in Medicare Part B when first eligible, you pay a 10% penalty added to your monthly Part B premium for every full 12-month period you could have had Part B but didn't — for the rest of your life. TRICARE coverage does not exempt you from this penalty, because TRICARE is not considered 'employer-sponsored' coverage. The only way to guarantee no penalty is to enroll in Part B during your Initial Enrollment Period.
Who this is for
- •Anyone approaching Medicare eligibility
- •Retirees considering delaying Part B to save on premiums
- •Working retirees deciding whether to keep employer coverage primary
- •Spouses of retirees who are nearing 65
When this applies
- •The day after your Initial Enrollment Period ends, if you did not enroll
- •When you finally enroll during a General Enrollment Period
- •For every month going forward — the penalty is permanent
Military-specific
- •TRICARE Prime, TRICARE Select, and TFL do NOT qualify for a Special Enrollment Period.
- •VA healthcare does NOT qualify for a Special Enrollment Period either.
- •Federal Employees Health Benefits (FEHB) plans for retired federal workers also do NOT qualify for SEP — they are retiree coverage.
- •The only military-related coverage that can delay Part B without penalty is an actively-working spouse's employer plan.
Key takeaways
- The Part B late-enrollment penalty is 10% of the standard premium for every full 12 months you delayed — added permanently.
- TRICARE retiree coverage is NOT considered employer coverage and does not waive the penalty.
- Active employer group health plans (yours or your spouse's) DO qualify you for a Special Enrollment Period without penalty.
- TRICARE Pharmacy is creditable drug coverage, so TFL beneficiaries do not incur a Part D late-enrollment penalty.
- Penalties are calculated on the standard Part B base premium, not the IRMAA-adjusted amount.
- Once assessed, the penalty is virtually never reversed — treat your IEP deadline as firm.
Detailed explanation
The Medicare Part B late-enrollment penalty is one of the costliest mistakes a retired service member can make. Unlike most fees, it is permanent — it follows you for the rest of your life, applied to every monthly Part B premium.
This lesson explains exactly how the penalty works, why TRICARE does not protect you from it, and what you can do if you've already missed your window.
How the Part B penalty is calculated
The formula is simple but unforgiving:
10% of the standard Part B premium is added to your monthly premium for every full 12-month period you were eligible for Part B but did not enroll.
Real numbers
Assume the standard 2026 Part B premium is $202.90/month.
| Months delayed | Full 12-month periods | Penalty added | New monthly premium |
|---|---|---|---|
| 11 months | 0 | $0 | $202.90 |
| 12 months | 1 | $20.29 | $223.19 |
| 24 months | 2 | $40.58 | $243.48 |
| 36 months | 3 | $60.87 | $263.77 |
| 60 months | 5 | $101.45 | $304.35 |
Over a 20-year retirement, a 3-year delay costs roughly $13,000+ extra — for absolutely no additional benefit.
Why TRICARE doesn't help
The Social Security Administration grants a Special Enrollment Period (SEP) — and waives the penalty — only when you delayed Part B because you had active employer-sponsored coverage for you or your spouse.
The following coverages do NOT qualify for SEP:
- TRICARE Prime, TRICARE Select, or TRICARE For Life
- VA healthcare or CHAMPVA
- Federal Employees Health Benefits (FEHB) for retired federal workers
- Retiree health plans from a former civilian employer
- COBRA coverage
- Individual marketplace (Affordable Care Act) plans
If your only coverage is TRICARE and you delay Part B, the late-enrollment penalty applies from your IEP forward.
What if you missed your IEP?
If you missed your Initial Enrollment Period:
- Enroll during the next General Enrollment Period (January 1 – March 31).
- Coverage begins the month after your enrollment.
- The penalty applies to your monthly Part B premium permanently.
Between missing your IEP and the next GEP, you may have a gap in coverage. TRICARE Prime/Select has already ended; TFL cannot activate without Part B; and the GEP enrollment delays coverage until the month after enrollment.
Part D — you're already protected
Medicare has a separate late-enrollment penalty for Part D (prescription drug coverage). It works similarly: 1% of the national base beneficiary premium per month delayed, added permanently.
TRICARE Pharmacy beneficiaries are exempt. TRICARE Pharmacy is officially "creditable" prescription drug coverage. As long as you have TFL and your TRICARE Pharmacy benefit, you can choose not to enroll in Part D and you will never owe a Part D penalty.
If you ever drop TRICARE Pharmacy and later try to add Part D, the clock starts ticking. Keep TFL active to keep this protection.
Can the penalty ever be reversed?
In extremely narrow circumstances. SSA may grant "equitable relief" if you can prove that:
- A federal employee gave you written misinformation that caused you to delay enrollment, OR
- An administrative error prevented your enrollment.
Both standards are difficult to meet and require documentation. Do not plan on equitable relief as a backup.
The bottom line
For a retired service member with TFL, there is no rational reason to delay Part B at 65. The Part B premium is your only out-of-pocket cost for one of the most generous coverage combinations in U.S. healthcare. Pay it, activate TFL, and avoid a penalty that compounds every year of your retirement.
Continue learning
— suggested by the knowledge graph- What is Medicare? A complete overview for retired militaryA plain-English, handbook-grounded overview of the federal health insurance program for people 65 and older, written specifically for retired service members and their families.
- Understanding Original Medicare (Parts A & B) for veteransExactly what Part A and Part B cover, what they cost in 2026, and why both are required to keep TRICARE For Life.
- What is TRICARE For Life? The complete guide for retired militaryThe Medicare-wraparound benefit you earned through service — what it covers, who qualifies, what it costs, and how it activates.
- Medicare Part BThe medical insurance side of Original Medicare — covers doctor visits, outpatient care, preventive services, and durable medical equipment.
- Medicare Part DMedicare's optional prescription drug coverage — almost always unnecessary if you have TRICARE For Life.
- TRICARE For Life (TFL)The wraparound secondary health coverage for Medicare-eligible military retirees, spouses, and survivors — no premium, no enrollment fee.
- Initial Enrollment Period (IEP)The 7-month window around your 65th birthday when you first sign up for Medicare Parts A and B without penalty.
- General Enrollment Period (GEP)The January 1 – March 31 window each year when you can sign up for Medicare if you missed your IEP and don't qualify for an SEP.
- Special Enrollment Period (SEP)An enrollment window triggered by qualifying life events — TRICARE and VA care do NOT trigger one.
- Late Enrollment Penalty (Part B and Part D)A permanent monthly surcharge added to your Part B (10% per 12 months delayed) or Part D (1% per month delayed) premium for as long as you have Medicare.
- TRICARE Pharmacy ProgramThe DoD prescription drug benefit administered by Express Scripts — your drug coverage if you have TFL.
- VA HealthcareA separate federal healthcare system run by the Veterans Health Administration for enrolled veterans — it does not coordinate with Medicare or TRICARE For Life.
- MedicareThe federal health insurance program for people 65+, certain younger people with disabilities, and people with ESRD or ALS.
- What are the biggest mistakes retired military make at 65?Declining Part B, missing the IEP, ignoring DEERS, enrolling in Part D unnecessarily, and assuming MTF access continues. Each can cost thousands or end TFL.
- I missed my Medicare enrollment window. Now what?Use the General Enrollment Period (Jan 1 – Mar 31). You'll likely owe a Part B late penalty for life, and you'll have no TFL until Part B is effective.
- How long does Medicare enrollment take to process?Most online applications are approved in 1–3 weeks. SSA mails the Medicare card within about 30 days of approval.
- What is the 5-star Special Enrollment Period?A one-time-per-year chance (Dec 8 – Nov 30) to switch into a 5-star-rated Medicare Advantage or Part D plan in your area, outside the normal enrollment windows.
- What is the Initial Enrollment Period (IEP)?The 7-month window around your 65th birthday — 3 months before, your birthday month, and 3 months after — when you first enroll in Medicare without penalty.
- What is the General Enrollment Period?January 1 – March 31 each year. It's the backup enrollment window for people who missed their IEP and don't qualify for a Special Enrollment Period.
Real-world scenarios
Three-year delay 'to save money'
James decided at 65 that he couldn't afford the Part B premium and let his IEP pass. He had no other coverage because TRICARE Prime had already ended. At 68 he enrolled during the GEP. His permanent penalty: 30% of the standard premium — about $55/month extra for life. Over his remaining 20 years, that's $13,200 in penalty payments alone, on top of three years where TFL did not exist and he paid full price for every doctor visit.
Working spouse delays Part B correctly
Carol is 65 but her husband still works at age 63 and carries her on his active employer health plan. She delays Part B without penalty. When her husband retires at 65, his employer coverage ends. Carol enrolls in Part B during the 8-month SEP, no penalty, and TFL activates immediately.
What should I do next?
- 1Mark your IEP dates on your calendar — three months before your 65th-birthday month.
- 2If you're delaying Part B because of a spouse's employer plan, get written confirmation of the coverage dates.
- 3Never assume TRICARE will qualify you for a Special Enrollment Period — it does not.
- 4Read Lesson 7 to understand how Medicare and TFL pay claims after enrollment.
Continue with the AI assistant
Click a prompt to ask our Medicare & TRICARE For Life Educational Assistant. Grounded in the 2026 official handbooks.
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Frequently asked questions
I missed my IEP — what should I do now?
Enroll at the next General Enrollment Period (January 1 – March 31). Coverage begins the month after enrollment. The penalty applies, but enrolling immediately stops further accrual.
Can the penalty ever be removed?
Only under very narrow 'equitable relief' rules, typically requiring proof of federal-employee misinformation. Do not count on it.
Does the penalty apply if I had VA care only?
Yes. VA care does not qualify you for a Special Enrollment Period. Enroll in Part B at 65 to avoid the penalty.
What if I had FEHB as a federal retiree?
FEHB retiree coverage does not qualify for SEP. The penalty would apply. (Active federal employee FEHB does qualify.)
Does the penalty increase as the base premium increases?
Yes. The penalty is recalculated annually as a percentage of the standard Part B premium, so it grows when the premium grows.
Official government resources
- Medicare & You Handbook (2026)— CMS
- Sign up for Medicare (SSA)— Social Security Administration
- Medicare.gov — official program site— CMS
- Centers for Medicare & Medicaid Services— CMS
Official Medicare and TRICARE publications are the definitive source. This page is an independent educational summary; always confirm specifics against the resources above.
Sources reviewed for this lesson
- • Medicare & You Handbook 2026 — Late-enrollment penalty section
- • TRICARE For Life Handbook 2026 — Medicare enrollment requirements
- • SSA.gov — Medicare Part B late-enrollment penalty
- • CMS — Special Enrollment Period eligibility rules
- • Medicare.gov — Creditable prescription drug coverage
See Source Methodology for how we research, write, and update every lesson.