Public Health Insurance Premium Calculator
Estimate your monthly Marketplace health insurance premium after ACA income-based subsidies (Premium Tax Credits).
Formulas Used
1. Federal Poverty Level (FPL):
FPL = $15,060 + ($5,380 × (household_size − 1)) [2024 contiguous US]
2. Full Monthly Premium:
Full Premium = Base ($450) × Age Factor × Tier Multiplier × Tobacco Surcharge
Age Factor: ACA 3:1 age-rating curve (age 21 = 1.000, age 64 ≈ 3.000)
Tier Multipliers: Bronze 0.82 | Silver 1.00 | Gold 1.15 | Platinum 1.30
Tobacco Surcharge: ×1.50 if applicable
3. Required Contribution % (ACA 2024 schedule):
<150% FPL → 0% | 150–200% → 0–2% | 200–250% → 2–4%
250–300% → 4–6% | 300–400% → 6–8.5% | >400% → 8.5%
4. Monthly Premium Tax Credit (Subsidy):
Subsidy = max(0, Benchmark Silver Premium − (Income × Cap%) / 12)
5. Net Monthly Premium:
Net Premium = max(0, Full Premium − Subsidy)
Assumptions & References
- 2024 Federal Poverty Level guidelines (HHS): $15,060 base + $5,380/additional person (contiguous US).
- National average Silver benchmark premium of $450/month for a 21-year-old used as reference; actual premiums vary significantly by state and insurer.
- ACA 3:1 age-rating band: oldest enrollees pay no more than 3× youngest adult rate (45 CFR §147.102).
- Premium Tax Credit schedule per IRS Rev. Proc. 2023-29 (2024 parameters).
- American Rescue Plan Act (ARP) subsidy expansion (no 400% FPL cliff) extended through 2025 under the Inflation Reduction Act.
- Tobacco surcharge capped at 50% per ACA rules; some states prohibit it.
- Medicaid eligibility threshold is generally 138% FPL in expansion states; 100% FPL used as conservative floor here.
- Does not account for cost-sharing reductions (CSR), employer coverage offers, or state-specific programs.
- Source: Healthcare.gov FPL, IRS Rev. Proc. 2023-29.