Health Insurance Subsidy Calculator (ACA)
Estimate your ACA premium tax credit (health insurance subsidy) from your household income, expected contribution percentage, and the benchmark plan premium.
How to use this tool
- Estimate your household annual income (MAGI) for the coverage year.
- Enter the applicable contribution percentage from the ACA sliding scale (about 2% to 8.5%).
- Enter the monthly premium of the benchmark (second-lowest-cost Silver) plan.
- Read your estimated monthly subsidy and net premium, then confirm at HealthCare.gov.
Under the Affordable Care Act, the premium tax credit caps what you pay for a benchmark Marketplace plan at a sliding-scale percentage of your income. This calculator estimates that subsidy: it works out your expected contribution, then credits you the rest of the benchmark premium. Enter the figures from your Marketplace application for a personalized estimate.
Formula
ACA premium tax credit
Expected monthly contribution = Annual income × Contribution% ÷ 12
Monthly subsidy = max(0, Benchmark premium − Expected contribution)
Net premium = Benchmark premium − Monthly subsidy
The subsidy is floored at zero — if your expected contribution exceeds the benchmark premium, you receive no credit.
How it works
The Affordable Care Act's premium tax credit is designed so that an eligible household never pays more than a set percentage of its income for the benchmark plan — the second-lowest-cost Silver plan in its area. That applicable percentage rises on a sliding scale with income. The government pays the difference between this expected contribution and the benchmark premium as an advance tax credit sent directly to your insurer.
This calculator implements that rule directly: you supply the income, the applicable percentage from the ACA sliding scale, and the benchmark premium, and it returns the subsidy and your net cost. Because the contribution percentage and benchmark premiums are set annually and vary by household size and location, this is an estimate — the official figure is calculated by the Marketplace from current-year tables when you apply. The credit is also reconciled on your tax return against your actual income, so a mid-year income change can increase or decrease what you ultimately owe or get back.
You can apply the credit to a plan at any metal level, not just Silver; if you pick a cheaper Bronze plan, the same subsidy can cover a larger share — sometimes all — of the premium. For the authoritative determination and to enroll, use the official Marketplace at HealthCare.gov or your state exchange.
Worked example
$40,000 income, 6% expected contribution, $600 benchmark
- Expected annual contribution: $40,000 × 6% = $2,400 per year.
- Convert to monthly: $2,400 / 12 = $200 expected each month.
- Subtract from the benchmark premium: $600 − $200 = $400 monthly subsidy.
- Your net monthly premium for the benchmark plan: $600 − $400 = $200.
Monthly subsidy (tax credit): $400.00
Estimated monthly subsidy by income and contribution % ($600 benchmark plan)
| Annual income | 2% contribution | 4% contribution | 6% contribution | 8.5% contribution |
|---|---|---|---|---|
| $24,000 | $560.00 | $520.00 | $480.00 | $430.00 |
| $40,000 | $533.33 | $466.67 | $400.00 | $316.67 |
| $60,000 | $500.00 | $400.00 | $300.00 | $175.00 |
| $80,000 | $466.67 | $333.33 | $200.00 | $33.33 |
| $100,000 | $433.33 | $266.67 | $100.00 | $0.00 |
Key terms
- Premium tax credit
- A federal subsidy that lowers your monthly Marketplace health-insurance premium based on income.
- Benchmark plan
- The second-lowest-cost Silver plan available to your household; the subsidy is calculated against its premium.
- MAGI
- Modified Adjusted Gross Income — the household income measure the Marketplace uses to size your subsidy.
- Applicable percentage
- The sliding-scale share of income (roughly 2% to 8.5%) you're expected to put toward the benchmark premium.
Frequently asked questions
- How is the ACA subsidy calculated?
- The Marketplace caps your cost for the benchmark Silver plan at a percentage of your income that rises with income. The premium tax credit pays the difference between that expected contribution and the benchmark premium.
- What is the benchmark plan?
- It's the second-lowest-cost Silver plan offered in your area for your household. Your subsidy is tied to its premium, but you can apply the credit to any plan you choose.
- Why might my subsidy be zero?
- If your expected contribution (income times the applicable percentage) is higher than the benchmark premium, there's nothing left for the credit to cover, so the subsidy is zero.