Health Insurance Subsidy Calculator
Calculate your ACA Marketplace premium tax credit to see how much the federal government will subsidize your health insurance. Useful during Open Enrollment or after an income change.
About this calculator
Under the Affordable Care Act, premium tax credits are designed to cap the share of income households spend on a benchmark Silver plan. The formula here is: Subsidy = max(0, (benchmarkPremium × 12) − (annualIncome × (0.095 + 0.015 × (householdSize − 1)))). The benchmark plan is the second-lowest-cost Silver plan available in your area. The required contribution percentage starts at 9.5% of income for a single person and increases by 1.5 percentage points for each additional household member. If your benchmark plan's annual cost exceeds what you are expected to contribute, the difference is paid as a tax credit. If the expected contribution already covers the full premium, the subsidy is zero. Eligibility generally applies to households with incomes between 100% and 400% of the Federal Poverty Level, though the American Rescue Plan temporarily expanded upper limits.
How to use
Suppose a household of 3 has an annual income of $60,000 and a benchmark Silver plan premium of $650/month. Expected contribution rate = 0.095 + 0.015 × (3 − 1) = 0.095 + 0.03 = 0.125 (12.5%). Annual expected contribution = $60,000 × 0.125 = $7,500. Annual benchmark cost = $650 × 12 = $7,800. Subsidy = max(0, $7,800 − $7,500) = $300 per year, or $25/month off your premium. Entering these values into the calculator confirms the subsidy and helps you compare plan options.
Frequently asked questions
How does household size affect my ACA health insurance subsidy amount?
Larger households receive a slightly higher subsidy because the formula increases the required contribution percentage by 1.5% for each additional member, which lowers the income-based threshold the government expects you to pay. This reflects the reality that supporting more people on the same income leaves less room for insurance costs. A family of four with $70,000 in income will receive a larger subsidy than a single person earning $70,000. Always report your full household size accurately on your Marketplace application to receive the correct credit.
What is the benchmark Silver plan and why does it matter for subsidy calculations?
The benchmark plan is the second-lowest-cost Silver-tier health plan available on the ACA Marketplace in your county. The government uses its premium to calculate your tax credit, but you can apply that credit toward any Marketplace plan. If you choose a cheaper Bronze plan, your out-of-pocket premium will be lower than if you apply the credit to a Gold plan. The benchmark premium varies significantly by location and age, which is why the calculator asks for the oldest adult's age — older applicants face higher rated premiums.
What income level makes you eligible for ACA premium tax credits?
Generally, eligibility begins at 100% of the Federal Poverty Level (FPL) and extends to 400% FPL under original ACA rules. The American Rescue Plan Act of 2021 eliminated the 400% FPL cliff, making subsidies available to higher-income households if their benchmark premium exceeds 8.5% of income. For 2024, 100% FPL is approximately $15,060 for an individual and $31,200 for a family of four. Medicaid typically covers those below 138% FPL in expansion states, so the subsidy range effectively starts there for most applicants.