Here's the part many people don't know: 46% of uninsured Americans qualify for a $0/month plan, and roughly 6.8 million could get full coverage with no premium at all. Another 1.3 million qualify for plans under $50/month.
This guide walks through the dates, eligibility rules, enrollment steps, subsidies, and what happens if you miss the window entirely.
Key Takeaways
- Federal open enrollment runs November 1, 2026 – January 15, 2027; several states extend into late January.
- Missing the deadline means waiting until next year unless you qualify for a Special Enrollment Period.
- 92% of applicants got premium tax credits in the last reported enrollment period (CMS).
- TrueCost Group Licensed Advisors check your subsidy eligibility free, with no obligation.
What Is ACA Open Enrollment?
ACA open enrollment is the annual window to shop, compare, and enroll in (or switch) an Affordable Care Act marketplace health plan. It applies both to plans purchased through HealthCare.gov or a state exchange and to ACA-compliant plans sold directly by insurers off-exchange.
Basic eligibility requires that you:
- Live in the United States
- Are a US citizen or lawfully present resident
- Are not currently incarcerated
- Are not enrolled in Medicare
That last rule is why ACA open enrollment and Medicare’s Annual Enrollment Period get mixed up so often.
ACA Open Enrollment vs. Medicare AEP
They serve different people.
ACA open enrollment covers marketplace plans for people under 65 without employer coverage.
Medicare’s Annual Enrollment Period, running October 15 through December 7, lets Medicare-eligible seniors switch Medicare Advantage or Part D drug plans.
If you're on Medicare, the ACA marketplace isn't for you—and vice versa.
ACA open enrollment exists so people without job-based insurance can get subsidized, comprehensive coverage through the marketplace.
2026–2027 ACA Open Enrollment Dates and Key Deadlines
The federal marketplace window for 2027 coverage is November 1, 2026 through January 15, 2027. Enroll by December 15, 2026 and coverage starts January 1. Sign up between December 16 and January 15, and your plan starts February 1 instead — after you pay your first premium.
Several state-run exchanges push their deadlines further out:
| State/Exchange | Enrollment Window |
|---|---|
| Federal (HealthCare.gov) | Nov 1, 2026 – Jan 15, 2027 |
| Covered California | Nov 1, 2026 – Jan 31, 2027 |
| NY State of Health | Nov 1, 2026 – Jan 31, 2027* |
| DC Health Link | Nov 1, 2026 – Jan 31, 2027 |
*NY dates follow the prior-year pattern and may be confirmed closer to open enrollment.
Miss your state's deadline, and you're locked out of marketplace plans for the year — unless a qualifying event triggers a Special Enrollment Period.
Special Enrollment Periods (SEPs): Enrolling Outside Open Enrollment
Life doesn't wait for November. If one of these happens, you generally get a 60-day window to enroll:
- Losing job-based coverage, Medicaid, or other qualifying insurance
- Getting married or divorced
- Having a baby, adopting, or fostering a child
- Moving to a new ZIP code or county
- A significant income change affecting subsidy eligibility
Medicaid or CHIP loss extends this window to 90 days in some cases. Miss that window, and you'll need to wait for the next open enrollment.
How to Enroll in an ACA Marketplace Plan: Step-by-Step
Enrolling isn't complicated once you know the sequence. Here's the process:
- Gather your documents. Collect Social Security numbers, income details, household size, proof of citizenship or residency, and current coverage information.
- Compare plan tiers. Bronze covers 60% of costs, Silver 70%, and Gold 80%. Lower premiums mean higher out-of-pocket costs, so match the tier to how often you use care.
- Verify your network. Confirm your doctors and prescriptions are in-network before you enroll.
- Check subsidy eligibility. Household income relative to the federal poverty level determines your premium tax credit.
- Apply and select a plan. Enroll online, by phone, or with a licensed broker.
- Confirm enrollment. Review your confirmation, set up autopay, and read your welcome packet.
If you'd rather not navigate the steps alone, TrueCost Group's Licensed Advisors help with every one at no cost through text-based quotes. Clients have secured plans such as:
- CareSource Marketplace Silver 3 HMO at $0/month with a $0 deductible
- UnitedHealthcare Silver-D Value at $14.64/month (down from $737.64)
Advisors work with major carriers including Humana, UHC, Aetna, and WellCare.
Understanding ACA Subsidies and Cost-Saving Programs
Two financial tools drive down the cost of ACA coverage: premium tax credits and cost-sharing reductions.
Premium tax credits lower your monthly bill based on income relative to the federal poverty level. Households from 100% to 400% of FPL typically qualify, and enhanced credits can still cut costs above 400% FPL when premiums exceed a capped share of income. Using 2023 FPL thresholds as a snapshot, that reached about $58,320 for one person and $120,000 for a family of four.
Cost-sharing reductions (CSRs) work differently: they lower deductibles and copays, but only on Silver plans, and only for eligible income ranges. One TrueCost client, a 57-year-old earning $20,000, landed a Silver CSR plan with a $200 deductible and $650 out-of-pocket max, at $0/month.
According to CMS's 2025 Open Enrollment Report, 92% of exchange consumers received premium tax credits, and 51% received CSRs. Most marketplace shoppers use at least one of these savings tools.
Beyond the Premium
Many plans now bundle extras that add real value:
- Dental, vision, and hearing coverage on select plans
- Over-the-counter allowances
- Grocery card allowances
- 24/7 telehealth or nurse hotlines
- Transportation to medical appointments
What Happens If You Do Nothing During Open Enrollment?
Doing nothing doesn't mean losing coverage outright. Most plans auto-renew. But auto-renewal comes with risks.
Centers for Medicare & Medicaid Services (CMS) reported 10.8 million automatic re-enrollees for 2025, a 65% jump from the year before. If you don't actively update your information, you could lose cost-sharing reduction (CSR) benefits or get stuck in a plan whose network or pricing has changed.
There's also a new wrinkle: for 2026, consumers who don't confirm eligibility information may be automatically assigned a $5 monthly premium, even if they previously paid $0.
No federal penalty exists anymore for staying uninsured, but some states still enforce their own mandate:
- Massachusetts: up to $211/month for high earners
- New Jersey: $695 to $4,908 depending on household
- California: greater of $950/adult or 2.5% of income above the filing threshold
- Rhode Island: penalty applies, exact formula not published
- DC: up to $2,385 per family or 2.5% of income
Reviewing your options every year, even if you're happy with your current plan, is worth the ten minutes it takes.
Frequently Asked Questions
What is ACA enrollment?
ACA enrollment is the process of signing up for a marketplace health plan, either during the annual open enrollment window or through a Special Enrollment Period triggered by a qualifying life event.
What happens if you do nothing during open enrollment?
Most plans auto-renew, but you risk losing cost-sharing reduction benefits or staying in a plan with outdated pricing or network coverage. You could also miss a cheaper or better-fitting plan.
What is the difference between annual enrollment and open enrollment?
ACA open enrollment covers marketplace plans for people under 65 without employer coverage. Medicare's Annual Enrollment Period (Oct 15–Dec 7) is for Medicare-eligible seniors changing Medicare Advantage or Part D plans.
What are the changes to Covered California in 2026?
For 2026, Covered California reported a preliminary 10.3% average rate increase and 11 participating insurers. Aetna’s exit affects roughly 21,000 enrollees, and the state allocated $190 million toward subsidies for lower-income residents.
How do I know if I qualify for a $0/month plan?
Eligibility depends on your household income and family size relative to the federal poverty level. A licensed advisor at TrueCost Group can check your eligibility quickly at no cost.
Can I still get coverage if I missed open enrollment?
Yes, if you have a qualifying life event like job loss, marriage, or moving, you get a 60-day Special Enrollment Period. Otherwise, short-term or off-marketplace options may bridge the gap until next enrollment.
