The Affordable Care Act (ACA), also known as Obamacare, includes subsidies that reduce health insurance costs for millions of Americans.
November 12, 2025
high
temporal
General description of ACA subsidies and their purpose
Open enrollment for Affordable Care Act marketplace plans in most U.S. states begins on November 1 each year.
November 01, 2025
high
temporal
Annual start date for ACA marketplace open enrollment windows in most states.
The Affordable Care Act's annual open enrollment period for marketplace health plans typically begins on November 1.
November 01, 2025
high
procedural
Standard annual schedule for the federal ACA marketplace open enrollment window.
The annual open enrollment period for Affordable Care Act (ACA) marketplace plans typically begins on November 1.
November 01, 2025
high
temporal
Start date for the yearly enrollment window for ACA marketplace coverage.
Over 20 million people use Affordable Care Act (ACA) subsidies to make their health insurance more affordable.
October 08, 2025
high
temporal
Describes the scale of ACA premium subsidy usage.
The Affordable Care Act (ACA), often called Obamacare, includes premium tax credits (subsidies) that lower health insurance premiums for people who purchase coverage through health insurance marketplaces.
October 08, 2025
high
definition
Describes the role of premium tax credits within the ACA marketplace framework.
Open enrollment for the federal ACA health insurance marketplaces typically begins on November 1 each year.
October 08, 2025
high
temporal
States the common annual start date for ACA marketplace open enrollment.
In 2025, roughly 24 million people were enrolled in Affordable Care Act (ACA) marketplace coverage in the United States.
October 07, 2025
high
statistical
Aggregate enrollment size for ACA marketplace plans reported during the 2025 open enrollment period.
As of October 7, 2025, a record 24 million people were enrolled in insurance coverage through the Affordable Care Act (ACA) marketplaces.
October 07, 2025
high
temporal
Enrollment total for ACA marketplace coverage reported contemporaneously with ongoing policy debates.
The Inflation Reduction Act, enacted in 2022, extended the enhanced Affordable Care Act (ACA) premium tax credits through 2025.
January 01, 2022
high
policy
Legislative extension of ACA premium subsidies
Higher premium subsidies for Affordable Care Act (ACA) marketplace plans were first implemented in 2021 as part of COVID-19-era policy changes.
March 11, 2021
high
temporal
Federal policy expansion that increased premium assistance for marketplace enrollees.
The Biden administration enhanced Affordable Care Act (ACA) premium tax credits in 2021 with the stated goal of making healthcare more available to a wider swath of Americans during the COVID-19 pandemic.
January 01, 2021
high
policy
Policy change to ACA premium subsidies during the COVID-19 pandemic
A 2021 expansion of the Affordable Care Act established enhanced premium tax credits for people purchasing health insurance through ACA marketplaces.
January 01, 2021
high
temporal
Policy change expanding subsidies for ACA marketplace enrollees.
The Affordable Care Act (ACA) was signed into law on March 23, 2010.
March 23, 2010
high
temporal
Foundational U.S. federal health care law often referred to as 'Obamacare'.
Open enrollment for the Affordable Care Act (ACA) health insurance marketplaces begins on November 1 each year.
high
policy
Annual schedule for enrollment in ACA marketplace health plans.
Obamacare is the informal name for the Affordable Care Act (ACA).
high
definition
Terminology / law name
Enhanced subsidies for the Affordable Care Act (ACA) were implemented as a COVID-19 pandemic-era measure to temporarily increase premium assistance for enrollees.
high
policy
Temporary expansion of ACA premium subsidies tied to pandemic relief efforts.
The Affordable Care Act (ACA) includes premium subsidies for people who purchase health insurance through ACA marketplaces to help lower their insurance costs.
high
temporal
Description of ACA marketplace premium subsidy policy