Health insurance first became mandatory nationwide in the United States on January 1, 2014, under the Affordable Care Act (ACA). That federal requirement lasted five years before the penalty was effectively eliminated in 2019. But the full story is more layered: Massachusetts had its own mandate eight years earlier, and today several states still require residents to carry coverage.
Massachusetts Started It in 2006
Massachusetts became the first state to require health insurance when its Health Care Reform Law took effect in 2006. The law requires most residents over 18 to maintain coverage for the entire calendar year or face a tax penalty. Plans must meet a minimum standard of coverage set by the state’s Health Connector, and the mandate only applies if insurance is deemed affordable for that person based on income thresholds.
The Massachusetts model included a three-month grace period, so a brief lapse in coverage wouldn’t trigger a penalty. New residents also get 63 days to enroll after moving to the state or losing prior coverage. This framework became the direct blueprint for the national mandate that followed.
The Federal Mandate: 2014 to 2018
The Affordable Care Act, signed into law in March 2010, included what’s formally called the “individual shared responsibility provision.” It required most Americans to maintain qualifying health insurance starting January 1, 2014. Anyone who didn’t carry coverage owed a penalty on their federal tax return.
The penalty started small and grew each year. In 2014, it was the greater of $95 per adult or 1% of household income above the filing threshold. By 2016, it had risen to $695 per adult or 2.5% of income, whichever was higher. For families, the flat-dollar penalty was capped at three times the per-adult amount. These escalating penalties were designed to push healthier people into the insurance market, which would in turn lower premiums for everyone.
Not everyone owed the penalty. The IRS recognized several exemptions: members of religious sects opposed to insurance benefits, people who experienced a coverage gap shorter than three consecutive months, those who faced financial hardship, and anyone for whom the cheapest available plan exceeded a set percentage of household income (the “affordability” exemption).
Employers Had Their Own Requirement
The ACA didn’t just target individuals. Employers with 50 or more full-time workers (including full-time equivalents) were required to offer affordable health coverage to their employees or face penalties of their own. This “employer shared responsibility provision” was originally set to begin alongside the individual mandate in 2014, but the Treasury Department granted transition relief that year. Full enforcement for large employers began in 2015, with smaller large employers (50 to 99 workers) phasing in by 2016.
Unlike the individual mandate, the employer mandate remains in effect today. If you work for a company with 50 or more employees, your employer is still legally required to offer you health coverage that meets minimum value and affordability standards.
The Federal Penalty Dropped to Zero in 2019
In December 2017, Congress passed the Tax Cuts and Jobs Act, which reduced the individual mandate penalty to $0 starting in 2019. The law technically didn’t repeal the mandate itself. You’re still “supposed” to have coverage under federal law, but there’s no financial consequence for going without it.
The penalty had been generating roughly $5 billion in federal revenue each year, so zeroing it out was a significant fiscal decision. Critics warned it would cause healthier people to drop coverage, raising premiums for those who remained insured. Supporters argued the penalty was an unfair burden on people who genuinely couldn’t afford plans, even with subsidies.
How the Mandate Affected Coverage Rates
The mandate years did coincide with a substantial drop in the number of uninsured Americans. Before the ACA’s major coverage expansions began, the uninsured rate was significantly higher than the 11.1% (about 30 million people under 65) recorded by mid-2020. Most of that progress happened between 2014 and 2016, when the mandate penalties were ramping up and Medicaid expansion was rolling out across states. Disentangling the mandate’s specific effect from other ACA provisions like subsidized marketplace plans and Medicaid expansion is difficult, but the overall trend was clear: more people carried insurance during the years when skipping it cost money.
States That Still Require Coverage
After the federal penalty was zeroed out, several states stepped in with their own mandates. Today, five states and the District of Columbia enforce individual health insurance requirements:
- Massachusetts has continuously enforced its mandate since 2006, independent of whatever happened at the federal level.
- New Jersey passed the Health Insurance Market Preservation Act in 2018, creating a state-level penalty that took effect when the federal one disappeared.
- California reinstated an individual mandate in 2020, with penalties collected through the state tax return.
- Rhode Island implemented its mandate in January 2020.
- Washington, D.C. began enforcing its mandate in January 2020.
- Vermont technically requires residents to have coverage but imposes no financial penalty for noncompliance.
If you live in one of these states, going without insurance still carries a real tax penalty. The amounts and calculations vary by state, so the specifics depend on where you file.
Medicare’s Indirect Mandate
While most people think of the ACA when they hear “mandatory health insurance,” Medicare has its own version of compulsory enrollment for people 65 and older. You’re not technically required to sign up, but the penalties for delaying are steep enough that it functions like a mandate in practice.
If you delay enrolling in Medicare Part B beyond your initial enrollment window without qualifying employer coverage, you’ll pay an extra 10% on your monthly premium for every full year you waited. That penalty is permanent: it’s added to your premium for as long as you have Part B. At the 2026 standard premium of $202.90 per month, a two-year delay adds about $40.60 monthly for life. Part D (prescription drug coverage) works similarly, adding 1% per month of delay to a base figure, and that penalty also sticks with you indefinitely.
These escalating, lifelong penalties create a strong financial incentive to enroll on time. For most Americans turning 65, signing up for Medicare during the initial enrollment period isn’t optional in any practical sense.