If you have health insurance through the Affordable Care Act (ACA) Marketplace, 2027 looks like another year of ACA changes.
Premiums, subsidies, plan options, eligibility rules, and even the Open Enrollment timeline are changing. For Tennessee residents who buy their own health insurance, that means it is more important than ever to review your coverage rather than simply letting your current plan renew.
Here’s what you need to know before ACA Open Enrollment begins.
ACA Open Enrollment Dates for 2027
The ACA Open Enrollment timeline for 2027 is something to keep in mind as you review your coverage.
For Tennessee and other states that use the federal Marketplace at HealthCare.gov, Open Enrollment runs from:
November 1, 2026 – January 15, 2027
If you want your coverage to begin January 1, 2027, you’ll need to enroll or make a plan change by December 15, 2026.
You can still enroll through January 15, but coverage selected after December 15 will generally have a February 1, 2027 effective date.
So, if January 1 coverage is important to you, December 15 is the date to keep on your calendar.
2027 ACA Open Enrollment Dates at a Glance
- November 1, 2026: Open Enrollment begins
- December 15, 2026: Last day to enroll for January 1 coverage
- January 1, 2027: Coverage begins for those who enroll by December 15 and pay their first premium
- January 15, 2027: Open Enrollment ends
- February 1, 2027: Coverage begins for those who enroll between December 16 and January 15
After January 15, you generally need to qualify for a Special Enrollment Period to enroll in or change Marketplace coverage.
Premiums Are Expected to Remain a Concern
ACA Marketplace premiums have already increased significantly for many people, and 2027 is expected to bring additional increases.
KFF’s analysis of insurers’ 2027 filings found a median proposed premium increase of 15% nationwide. These are proposed rates rather than a prediction of what every person will actually pay, and rates can vary considerably by state, carrier, age, location, and plan.
Insurers have pointed to several factors behind the proposed increases, including higher healthcare and prescription drug costs, inflation, labor costs, and changes in the Marketplace risk pool.
For Tennessee consumers, the amount you actually pay will depend on the plans available in your rating area and whether you qualify for a premium tax credit.
The Enhanced ACA Subsidies Are Still Gone
Another major factor going into 2027 is the expiration of the enhanced ACA premium tax credits that were available through 2025.
The regular ACA premium tax credit remains available to people who qualify, but the enhanced subsidies that had provided additional financial assistance expired at the end of 2025.
That change has already affected what many people pay for Marketplace coverage. People with higher household incomes can be particularly affected because some households that previously qualified for assistance no longer qualify for a premium tax credit.
For 2027, your subsidy will depend on factors including your household income, household size, age, location, and the cost of benchmark coverage in your area.
This is one reason it is important to update your Marketplace application every year rather than assuming your current premium will carry over.
Don’t Assume Your Current Plan Is Your Best Option for 2027
Marketplace plans can change from year to year.
A plan may have a different:
- Monthly premium
- Deductible
- Out-of-pocket maximum
- Copays or coinsurance
- Prescription drug coverage
- Provider network
- Hospital network
- Available doctors and specialists
And the carrier or plan you have today may not be offered in your area for 2027.
Tennessee uses the federally facilitated Marketplace, and the Tennessee Department of Commerce and Insurance has published 2027 ACA filing information and carrier information. Carrier availability varies by rating area, so the options available to someone in Nashville may not be exactly the same as those available elsewhere in Tennessee.
That’s why simply looking at the monthly premium isn’t enough.
A plan that saves you $50 a month may not save you money if your doctor is out of network, your prescriptions are more expensive, or the deductible is significantly higher.
There Are Also ACA Changes to Marketplace Eligibility and Verification
Some of the 2027 ACA changes involve how eligibility and enrollment are verified.
For example, federal rules are adding additional income verification requirements in certain situations and continuing efforts to verify eligibility for Special Enrollment Periods.
The federal Marketplace will also continue using stricter rules surrounding eligibility for premium tax credits and verification of information provided on applications.
This makes it especially important to provide accurate information about your household, income, and current coverage when applying for Marketplace insurance.
Some Marketplace Plan Designs May Look Different
The Centers for Medicare & Medicaid Services (CMS) has also finalized several ACA changes that will affect Marketplace plans beginning in 2027.
Among other ACA changes, federal requirements for standardized plan options are being discontinued. That could mean more variation in how plans are structured and how deductibles, copays, and other cost-sharing features are designed.
CMS is also changing certain cost-sharing rules for Bronze plans beginning in 2027.
For consumers, the takeaway is simple: don’t compare plans based on premium alone.
Look at the entire picture.
What Should You Do Before ACA Open Enrollment?
You don’t have to wait until November 1 to start preparing.
Before Open Enrollment begins, take a few minutes to consider how the ACA changes affect you.
1. Estimate your 2027 household income
Your income can affect both your eligibility for financial assistance and how much you pay for coverage.
If your income is changing because of a new job, retirement, self-employment, Social Security, or another reason, make sure your Marketplace application reflects your best estimate for 2027.
2. Make a list of your doctors and prescriptions
Before choosing a plan, check whether your preferred doctors, hospitals, and medications are covered.
Provider networks can vary significantly between plans, even when the insurance company is the same.
3. Look beyond the monthly premium
Compare the:
- Deductible
- Out-of-pocket maximum
- Copays
- Coinsurance
- Prescription costs
- Doctor and hospital networks
- Overall coverage
A lower monthly premium isn’t necessarily the lowest-cost option once you actually use your insurance.
4. Don’t automatically renew your current plan
Auto-renewal can be convenient, but it doesn’t mean your current plan will still be the right fit for 2027.
Take the time to compare what is available.
5. Don’t wait until the last minute
If you want coverage effective January 1, remember the new December 15 deadline.
Waiting until January can mean waiting until February 1 for your new coverage to begin.
ACA Open Enrollment Doesn’t Have to Be Complicated
There are a lot of moving pieces going into 2027, and the ACA changes can be difficult to keep up with.
The good news is you don’t have to figure everything out on your own.
If you already have an ACA Marketplace plan, this is a good time to review your coverage and see what is changing for 2027. If you’re shopping for coverage for the first time, comparing plans carefully can help you understand what you’re actually getting for your monthly premium.
If you have questions about your ACA coverage or want help reviewing your options for 2027, grab a spot on my calendar. I can help you look at the plans available and understand the differences before you make a decision.
ACA Open Enrollment begins November 1, 2026. Don’t wait until December to start looking at your options.
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