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Mark two dates on your calendar: December 15 and January 15. HealthCare.gov puts it plainly: “Enroll by December 15 for coverage that starts January 1.” Wait until the 16th and you land in the second bucket, because “if you enroll by January 15, coverage starts February 1.” Open enrollment for 2027 plans begins November 1, so these ACA enrollment deadlines give you about six weeks to get the first one right.
What the ACA enrollment deadlines cost you in January
The difference is a month of insurance. Picture a plan that ends December 31. Pick a new one on December 14 and nothing changes. Pick on January 10 and January goes uncovered, so a doctor visit or a prescription that month is yours to pay for unless other insurance steps in. HealthCare.gov defines the period as “November 1 – January 15 each year,” and says “plans and prices for 2027 will be available for preview shortly before Open Enrollment starts on November 1.” Our guide to ACA open enrollment for 2027 digs into premiums, and the November money calendar has the month’s other deadlines.
Income is where applications go sideways. The site wants your “expected household income for the year you want coverage, not last year’s income,” which trips up anyone whose pay is about to change. You can apply online, by phone, through a trained assister in your community, or on paper, and the page links an income calculator.
If you miss both dates, the door mostly closes. “Outside of Open Enrollment, you can enroll in Marketplace coverage only if you qualify for a Special Enrollment Period,” HealthCare.gov says, and its examples are life changes “like having a baby, getting married, or losing health coverage.” Medicaid and CHIP are different, with applications accepted “any time of the year.” This is general information, not insurance advice.
Editor’s take
Circle December 15, not January 15. The later date looks like a bonus, but all it buys is a February start, and January is when you’ll most want a card in your wallet.
