Published October 5, 2026. Subsidy formulas and plan offerings change annually — verify your specific eligibility and plans at HealthCare.gov. Educational information only — not financial advice.
Medicare gets all the attention this time of year. But if you are under 65 — or planning to retire before 65 — the deadline that matters to you is a different one entirely.
ACA Marketplace Open Enrollment for 2027 coverage runs November 1, 2026 through January 15, 2027.
If you are retiring early, this is the single largest number in your plan, and the window to act on it is finite. Here is the decision tree.
The Window: November 1, 2026 – January 15, 2027
| Date | What it means |
|---|---|
| November 1, 2026 | Open Enrollment opens for 2027 coverage |
| December 15, 2026 | Enroll by this day for coverage starting January 1, 2027 |
| December 16 – January 15 | Enroll here and coverage starts February 1, 2027 |
| January 15, 2027 | Open Enrollment closes for 2027 |
| November 1 – January 15 | Medicaid and CHIP accept applications year-round, outside this window |
The December 15 line is the one people miss. Enroll on December 20 and you have a one-month gap with no coverage in January — the most expensive month to be uninsured, because you are also resetting deductibles.
State-run marketplaces can differ. Most states use HealthCare.gov, but state-based marketplaces set their own windows and several extend past January 15. Check your state's exchange, not just the federal one.
Why This Deadline Beats Every Other One on Your Calendar
For early retirees, coverage between retirement and 65 is usually the biggest single line item in the plan — routinely $10,000–$22,000 a year for a couple before subsidies, and often the deciding factor between retiring at 58 and retiring at 63.
Unlike the tax deadlines, this one does not forgive a missed date. Skip it and — unless you qualify for a Special Enrollment Period — you generally cannot buy Marketplace coverage at all for 2027. No extension, no penalty payment, no appeals process. You wait until next November.
Step 1: Are You Subsidy-Eligible At All?
Start here, because the answer changes everything downstream.
Premium tax credits are based on your household income as a percentage of the Federal Poverty Level (FPL), measured using Modified Adjusted Gross Income (MAGI) — which is a term you will see again in Step 2, for a reason.
MAGI for subsidy purposes includes:
- Wages, self-employment income, and business income
- Traditional IRA and 401(k) withdrawals
- Roth conversions
- Taxable Social Security benefits
- Interest, dividends, and realized capital gains
- Unemployment compensation
MAGI does not include:
- Roth IRA withdrawals (basis or earnings) — genuinely invisible to the subsidy calculation
- Qualified withdrawals from an HSA
- Return of after-tax basis on non-Roth accounts
That difference between Traditional and Roth withdrawals is not a footnote. It is the whole planning opportunity.
Step 2: The Cliff, the Ladder, and the Roth Collision
Two mechanics drive nearly every early-retirement healthcare decision:
1. The subsidy structure. Enhanced premium tax credits — the ones that removed the old hard cut-off at 400% of FPL — have been the subject of recurring legislative extensions. Whether they are in effect for 2027 is something you must verify against current law and your exchange, not against an article written months ago. If the older structure applies, crossing 400% of FPL by a single dollar can cost you thousands in credits. If the enhanced structure applies, support tapers gradually instead of falling off a cliff.
Either way: a cliff or a taper means your income is a dial, not a given.
2. Roth conversions count as income. This is the collision at the center of early retirement planning. A Roth conversion is the best long-term tax move available in a low-income year — and it directly reduces your premium tax credit in the same year.
flowchart TD
A[ACA Open Enrollment<br/>Nov 1 – Jan 15] --> B{Retiring or<br/>already under 65?}
B -->|Yes| C[Estimate 2027 MAGI<br/>as a % of FPL]
B -->|No, on Medicare| Z[See the Medicare<br/>Open Enrollment post]
C --> D{Will you convert<br/>Traditional to Roth in 2027?}
D -->|Yes| E[Conversion raises MAGI<br/>and cuts the subsidy]
D -->|No| F[Maximum subsidy<br/>but no bracket fill]
E --> G[Compare: bracket saved today<br/>vs. credit lost now]
F --> G
Price the credit a Roth conversion costs you
See your projected income against the subsidy thresholds, then size a conversion with the premium tax credit loss on the same page. Free to start.
Model My Coverage and Conversion →G --> H{Leaving employer<br/>coverage?}
H -->|Yes| I[COBRA vs Marketplace:<br/>model 12 months of total cost]
H -->|No| J[Marketplace plan<br/>or spouse plan]
I --> K[Pick a plan on<br/>total annual cost, not premium]
J --> K
K --> L[Enroll by Dec 15<br/>for Jan 1 coverage]
**How to actually decide it:** price the conversion credit loss as a *rate*, not a shock. If a conversion costs you $3,000 in lost credits on a $40,000 conversion, that is an effective additional **7.5%** on top of your federal and state rate. Sometimes that is still the best trade available — filling a 12% or 22% bracket permanently is worth a lot. Sometimes it isn't. The failure mode is converting **without ever pricing the credit you gave up**, or skipping a decade of conversions because you never noticed the loss was only 7.5%.
**And know the escape hatch:** because Roth IRA *withdrawals* do not count toward MAGI, money you converted years ago can fund your living expenses during the bridge years **at zero cost to your subsidies**. That is what makes a Roth conversion ladder more than a tax trick — it is what lets you control your MAGI on purpose.
## Step 3: Compare Plans on Total Annual Cost, Not the Premium
The advertised premium is the least useful number on the page. The number that matters is:
> **Premium after credits + deductible + copays on your actual medications + worst-case out-of-pocket maximum**
Bronze plans can look cheapest and cost the most for anyone with regular prescriptions, because the deductible is enormous. Silver plans — and specifically **Cost-Sharing Reduction (CSR) Silver** plans, available at lower income levels — can carry a materially lower deductible and out-of-pocket maximum.
**Do this in 20 minutes:** on [HealthCare.gov](https://www.healthcare.gov/), enter your **actual providers, prescriptions, and dosages**, then sort by **total estimated annual cost including drugs**. Then check one more thing: **is your doctor and your preferred hospital still in the network for 2027?** Networks change every plan year.
> **Common miss:** comparing plans on the monthly premium, then discovering in March that a maintenance drug moved to a higher tier. Check the **2027 formulary**, and check whether your plan still covers it before you commit.
## Step 4: COBRA or the Marketplace?
The instinct after leaving a job is to take COBRA, because it keeps the doctors you know. Sometimes that's right. Usually it isn't — and the math is straightforward:
| Factor | COBRA | Marketplace |
|---|---|---|
| Monthly cost | Full premium, no employer share — often **$700–$2,200/month** for a family | Premium after tax credits |
| Subsidies | **Never** — COBRA is not eligible for premium tax credits | Yes, if income-eligible |
| Duration | 18 months, generally | As long as you qualify and pay |
| Special Enrollment Period | Taking COBRA is itself a **qualifying event** — you can switch to a Marketplace plan later | SEP available when you lose coverage, plus 60 days |
**The trap worth naming:** enrolling in COBRA and then discovering eight months later that you can't afford it. Losing COBRA coverage *does* open a Special Enrollment Period, so you are not permanently stuck — but you will pay full price for those eight months. Model the full year both ways before choosing.
## Step 5: The 60-to-65 Bridge Is a Five-Year Plan, Not a One-Year Decision
Most people optimize one enrollment year at a time. The better frame is the whole bridge:
1. **Map your income across all five years** — not just 2027. Which years are your lowest-income years? That is where the largest Roth conversions go, *and* where the largest subsidies live. They compete for the same MAGI space.
2. **Fill the Roth ladder in the cheap years** and draw from it in the expensive ones.
3. **Use HSA dollars for medical costs** — qualified withdrawals are tax-free and stay out of MAGI.
4. **Watch capital gains timing.** Realizing a large gain during the bridge years can wipe out a year of credits. Sometimes the right answer is to *not* sell.
5. **Re-run the plan every autumn**, because both the subsidy rules and your income will move.
Retiring at 60 means managing five enrollment years. Getting the sequence right is often worth **more than a year of savings**.
## When You Can Enroll Outside the Window
If you miss January 15, these are the routes back in — each a **Special Enrollment Period**:
- **Losing job-based coverage** — 60 days before and 60 days after
- **Moving** to a new service area
- **Getting married, divorced, or having a child**
- **A change in household income** that alters your subsidy eligibility
- **Turning 26** and losing a parent's plan
- **Leaving incarceration** or gaining lawful status
Compare that to the tax side: a missed December 31 Roth conversion is gone, but a missed January 15 enrollment can sometimes be repaired by a life event. Do not count on it. Treat January 15 as hard.
## The Timeline (Put These on Your Calendar)
| Date | Action |
|---|---|
| **October 2026** | Project your 2027 MAGI. Decide whether a 2027 Roth conversion is worth the credit it costs. |
| **November 1, 2026** | Open Enrollment opens — preview plans on your exchange |
| **Late Nov** | Compare plans on total annual cost using *your* providers and prescriptions |
| **December 15, 2026** | **Enroll by this day for January 1 coverage** |
| **December 31, 2026** | Roth conversion, RMD, and 401(k) deferral deadlines also land here |
| **January 15, 2027** | **Open Enrollment closes for 2027** |
| **January 31, 2027** | Check your first 1095-A reconciles with the credits you claimed |
The December 15 and December 31 lines sit together on purpose. For an early retiree, the healthcare decision and the tax decision are the same decision — both are governed by a single number: your MAGI.
## Put Your Own Numbers Behind It
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If you have been waiting to try the healthcare or tax tools, both are in the one plan, at $9.
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## Your Next Step
1. **Today:** Estimate your 2027 income as a percentage of FPL.
2. **This week:** If you plan a Roth conversion, price the premium tax credit it costs — as a percentage.
3. **Before you enroll:** Compare plans on total annual cost with your real prescriptions and doctors.
4. **If you left a job:** Model COBRA against the Marketplace for a full 12 months, not one.
5. **By December 15:** Enroll — so coverage starts January 1.
6. **By January 15:** Confirm. After that, the window is closed until next November.
---
> ⚠️ **Educational information only.** This article is not tax, legal, insurance, or financial advice. Premium tax credit formulas, FPL thresholds, and plan offerings change annually and are subject to legislative change. Verify eligibility and plans at [HealthCare.gov](https://www.healthcare.gov/) before enrolling, and consult a qualified tax professional about how a Roth conversion affects your credits.
### Related Reading
- [Medicare Open Enrollment 2027: The Decision Tree That Saves Real Money](/blog/medicare-open-enrollment-2027-decision-tree)
- [Can I Retire at 60?](/blog/can-i-retire-at-60)
- [Retirement Healthcare Costs: What to Expect in 2026](/blog/retirement-healthcare-costs-what-to-expect-2026)
- [Roth Conversion Before December 31, 2026: How to Size It to the Bracket](/blog/roth-conversion-before-december-31-2026)
- [The 7 Most-Searched Retirement Questions of 2026](/blog/most-searched-retirement-questions-2026)