The ACA premium subsidy (officially called the Advance Premium Tax Credit or APTC) is a federal tax credit that lowers your monthly health insurance premium on the Health Insurance Marketplace. It's based on your household income and the cost of the second-lowest-cost Silver plan (the "benchmark plan") in your area.
How the math works:
- The federal government calculates an "expected contribution" — the maximum percentage of your household income you should have to pay for the benchmark Silver plan. Under the IRA-extended 2026 schedule:
- Subsidy = (cost of benchmark Silver plan) − (your expected contribution)
- You can apply your subsidy to any Marketplace plan in your area — Bronze, Silver, Gold, or Platinum. If you pick Bronze (cheaper than benchmark Silver), your premium might drop to $0/month. If you pick Gold (more expensive), you pay the difference between Gold and your subsidy.
Federal Poverty Level (FPL) for 2026 (48 states + DC, used for 2026 plan year):
- 1 person: $15,650
- 2 people: $21,150
- 3 people: $26,650
- 4 people: $32,150
- 5 people: $37,650
- Each additional: +$5,500
Examples (single person, age 40, in a typical metro):
- Income $25,000 (160% FPL): Expected contribution ~1% = $20/mo; benchmark Silver ~$430/mo; subsidy = $410/mo, so you pay $20/mo for Silver or as little as $0/mo for some Bronze plans.
- Income $50,000 (320% FPL): Expected contribution ~6.5% = $271/mo; benchmark Silver ~$430/mo; subsidy = $159/mo, so you pay $271/mo for Silver or roughly $200/mo for Bronze.
- Income $75,000 (479% FPL): If 8.5% cap applies (current law): expected contribution $531/mo > benchmark $430 = $0 subsidy; you pay full price. If subsidy cliff returns in 2026 (current scheduled): same result — no subsidy above 400% FPL.
Cost-Sharing Reduction (CSR) bonus for Silver plans under 250% FPL:
If you're under 250% FPL AND pick a Silver plan, you also get CSR which lowers your deductible, copays, and out-of-pocket maximum. CSR Silver plans often have:
- $0–$300 deductible (vs. $7,000+ on standard Silver)
- $5–$10 PCP visits
- $1,500–$3,500 out-of-pocket max (vs. $9,200)
CSR is one of the most underused features of the ACA. Many people under 250% FPL pick Bronze for the lower premium and miss out on CSR Silver, which is often the better total value.
The 2026 subsidy cliff watch:
The IRA-extended subsidies (8.5% cap above 400% FPL) expire at end of 2025 unless Congress extends them. If they expire, anyone earning above 400% FPL loses ALL subsidy starting January 1, 2026 — premiums could increase by $500–$2,000+/month for higher-earning self-employed buyers and early retirees. As of mid-2026, watch for legislative action.
What to do next: [Use our free 60-second subsidy calculator](/aca/subsidy-calculator/) to see your estimated subsidy, or call (866) 534-1886 — we run your exact numbers including CSR eligibility and project the 2026 cliff impact. Free, no obligation.