Yes, the government can require you to get a vaccine, but the authority is narrower than most people assume and it does not include physically forcing anyone. State governments hold the primary power here, and they exercise it mainly through conditions: your child cannot enroll in school without required shots, your employer in a federally funded healthcare facility can require them, and refusing can cost you a job or school placement. Federal agencies have far less room to impose broad mandates on the general public, and most states let you claim a medical exemption, with religious and philosophical exemptions available in many.
Where the Authority Comes From
The legal basis is what courts call police power — the broad authority of state governments to protect public health, safety, and general welfare. That power belongs to the states under the Tenth Amendment, which reserves to state governments all authority not specifically granted to the federal government. Public health regulation, including controlling infectious disease, has always been treated as falling within that reserved authority.
Police power is broad but not unlimited. Courts check public health measures to confirm they are reasonable, not arbitrary, and genuinely connected to a legitimate health objective. A state cannot use a health emergency as a pretext for restrictions that bear no relationship to the actual threat.
The Supreme Court settled the core question in 1905. In Jacobson v. Massachusetts, Cambridge required residents to be vaccinated against smallpox. Henning Jacobson refused, was fined five dollars, and argued the law violated his Fourteenth Amendment rights.1Justia U.S. Supreme Court Center. Jacobson v. Massachusetts, 197 U.S. 11 (1905) The Court rejected the challenge, holding that individual liberty is not absolute and that states may impose reasonable regulations for the common good. Elected legislators, not courts, decide the best methods for preventing disease, and a state acting under its police power may require vaccination when it reasonably believes the public is at risk.2Oyez. Jacobson v. Massachusetts
Seventeen years later the Court extended that reasoning to schools. In Zucht v. King, San Antonio required children to present a vaccination certificate before attending any public or private school. Rosalyn Zucht was excluded and challenged the ordinance. The Court held that vaccination as a condition of school attendance is consistent with the Fourteenth Amendment, and that cities may delegate broad discretion to health officials in enforcing such requirements.3Justia U.S. Supreme Court Center. Zucht v. King, 260 U.S. 174 (1922)
What the Federal Government Can and Cannot Do
Two Supreme Court decisions issued the same day in January 2022 drew a sharp line. In National Federation of Independent Business v. OSHA, the Court blocked a federal rule that would have required roughly 84 million workers at large employers to get vaccinated or submit to weekly testing. The Occupational Safety and Health Act, the Court held, authorizes the agency to set workplace safety standards, not to impose broad public health measures addressing risks people face everywhere. When a federal agency claims authority over something of vast economic and political significance, Congress must have clearly granted that authority, and OSHA could not point to any such grant.4Supreme Court of the United States. National Federation of Independent Business v. OSHA, No. 21A244
On the same day, in Biden v. Missouri, the Court reached the opposite result for healthcare workers. The Secretary of Health and Human Services required staff at facilities receiving Medicare and Medicaid funding to be vaccinated, with medical and religious exemptions. The Court upheld the requirement because federal law explicitly authorizes the Secretary to set conditions on participation in those programs that are necessary for patient health and safety. Facilities that refused risked monetary penalties, denial of payment for new admissions, and eventually losing Medicare and Medicaid participation entirely.5Supreme Court of the United States. Biden v. Missouri, No. 21A240
Read together, these cases say the federal government can attach vaccine conditions to federal spending where Congress has clearly authorized it, but a federal agency cannot use vague or broadly worded statutes to create a sweeping mandate on the general public. A nationwide federal requirement that everyone get vaccinated is not legally viable under current law.
Where Mandates Actually Reach You
Schools
School immunization requirements are the most widespread form of vaccine mandate. All fifty states require children to receive certain vaccinations before enrolling in public school, though the specific vaccines and exemptions vary by state. The CDC publishes recommended immunization schedules that most states use as a baseline, covering vaccines for diseases including measles, mumps, rubella, polio, diphtheria, tetanus, pertussis, varicella, hepatitis A, and hepatitis B.6Centers for Disease Control and Prevention. Child and Adolescent Immunization Schedule by Age
Healthcare Facilities
Healthcare facilities routinely require staff to be vaccinated against diseases such as influenza and hepatitis B, because staff have direct contact with patients whose immune systems may already be compromised. Facilities participating in Medicare and Medicaid can be required to enforce vaccination as a condition of receiving federal funds.5Supreme Court of the United States. Biden v. Missouri, No. 21A240
The Military
Service members are subject to extensive vaccination schedules set by the Department of Defense. Readiness depends on personnel being protected against diseases they might encounter on deployment, and close quarters make outbreaks especially dangerous. The authority here flows from the military’s command structure rather than from state police power.
Private Employers
Private employers are not the government, but this is where many people actually encounter a vaccine requirement. Federal equal employment opportunity laws do not prevent an employer from requiring vaccination as a condition of employment. What the law does require is reasonable accommodations for workers who cannot be vaccinated due to a disability under the ADA or a sincerely held religious belief under Title VII.7U.S. Equal Employment Opportunity Commission. What You Should Know About COVID-19 and the ADA, the Rehabilitation Act, and Other EEO Laws
An employer can deny an accommodation only if granting it would cause undue hardship. In 2023, the Supreme Court raised that bar. Under Groff v. DeJoy, an employer must show that the accommodation would result in “substantial increased costs in relation to the conduct of its particular business,” not merely a trivial expense. Coworker resentment toward a religious accommodation, or hostility toward religion generally, cannot count as hardship.8Supreme Court of the United States. Groff v. DeJoy, No. 22-174 Accommodations for unvaccinated workers often take the form of remote work, regular testing, masking, or reassignment to positions with less public contact. An employer does not have to grant the specific accommodation you request, but it must genuinely consider alternatives before rejecting your claim.
Exemptions You Can Claim
Every state allows medical exemptions. If a vaccine would be genuinely dangerous to you because of an allergy, a compromised immune system, or a past serious reaction, a doctor can certify that you should not receive it. The medical conditions that qualify are narrow, and a general preference to avoid vaccines does not count.
Twenty-nine states and Washington, D.C. allow exemptions for religious objections. In most, the process involves a written statement describing the conflict between vaccination and your religious beliefs. Courts have held that states are not constitutionally required to offer religious exemptions. Four states currently allow no non-medical exemptions at all: California removed its personal and religious exemptions in 2015, Maine removed both in 2019, New York removed its religious exemption in 2019, and Connecticut did the same in 2021.
About sixteen states allow exemptions based on personal or philosophical objections unrelated to religion. These are the broadest available, and also the most frequently targeted for removal. States that offer them often attach conditions such as required educational counseling or signed attestations acknowledging the risks of non-vaccination.
When you claim a religious exemption in an employment context, your employer can ask questions to determine whether your belief is genuine. An employer might ask whether you have refused other medical interventions on religious grounds, request a letter from a religious leader, or ask you to explain how vaccination specifically conflicts with your faith. Political, philosophical, or medical objections do not qualify as religious beliefs under federal law, even if deeply felt.
What Happens If You Refuse
You will not be arrested or physically vaccinated. No modern American vaccine mandate works that way. The consequences are indirect, and they depend on the setting.
For school-age children, the most common consequence is exclusion from school. Children who do not meet immunization requirements and do not qualify for an exemption can be denied enrollment or temporarily removed from attendance, particularly during disease outbreaks. This applies to both public and private schools in most states.
For employees, refusing a workplace vaccine requirement without a valid exemption can lead to termination. At Medicare- and Medicaid-funded healthcare facilities, the facility itself risks financial penalties and potential loss of federal funding if it allows noncompliant staff to keep working.5Supreme Court of the United States. Biden v. Missouri, No. 21A240
Military service members who refuse required vaccinations can face disciplinary action through the military justice system, including possible administrative separation.
If a Vaccine Injures You
Because the government requires or encourages certain vaccines, federal law provides a compensation system for people who suffer serious adverse reactions. Two programs exist and which one applies depends on the vaccine.
The National Vaccine Injury Compensation Program (VICP) is a no-fault system covering most routine vaccines recommended for children and pregnant women, including those for measles, polio, pertussis, hepatitis A and B, HPV, and seasonal influenza.9Health Resources & Services Administration. Covered Vaccines To qualify, your injury must have lasted more than six months, resulted in hospitalization with surgery, or resulted in death. The filing deadline is three years from the first symptom of injury, or two years from the date of death.10Health Resources & Services Administration. Who Can File a Petition You must file with the U.S. Court of Federal Claims before you can sue a vaccine manufacturer in any other court; a direct lawsuit will be dismissed if you have not gone through the VICP process first.11Office of the Law Revision Counsel. 42 USC Chapter 6A, Subchapter XIX, Part 2 – National Vaccine Injury Compensation Program
COVID-19 vaccines are not covered by the VICP. Injuries from those products fall under the separate Countermeasures Injury Compensation Program (CICP), which operates under the PREP Act. The PREP Act provides broad immunity from liability, except for willful misconduct, to everyone involved in the development, distribution, and administration of covered countermeasures during a declared public health emergency.12U.S. Department of Health & Human Services. Public Readiness and Emergency Preparedness (PREP) Act The CICP is generally regarded as less favorable to claimants than the VICP: tighter filing deadlines, no judicial review, and historically lower compensation. If you believe you were harmed by a COVID-19 vaccine, filing promptly is important because the window is shorter than the VICP’s three years.