ACA Subsidy Calculator (2026)

Health insurance math changed sharply on January 1, 2026. The enhanced premium tax credits that had applied since 2021 expired at the end of 2025, and Congress did not extend them — so the rules reverted to the original ACA design. Two things came back: the hard subsidy cliff at 400% of the federal poverty level, above which you get nothing regardless of premium cost, and steeper expected contributions of 2.10% to 9.96% of income (IRS Rev. Proc. 2025-25), up from 0%–8.5% under the enhanced rules. For 2026 coverage, the cliff sits at $62,600 for a single person and $128,600 for a family of four in the 48 contiguous states. This calculator applies the actual 2026 schedule: give it your expected household income, household size, and your local benchmark Silver premium, and it returns your applicable percentage, your monthly share, and your estimated subsidy — or a clear warning if you're over the cliff or likely Medicaid-eligible instead.

The stakes of estimating income correctly are higher than they've been in years. A family a dollar under 400% FPL can receive hundreds of dollars a month in subsidy; a dollar over, zero. Subsidies also reconcile on Form 8962 at tax time — underestimate your income and you may repay credit you weren't owed. Auto-renewal is quietly dangerous in 2026: the marketplace carried forward 2025-era estimates for many enrollees, and the same income now buys a much smaller credit. Running the real numbers tells you whether you're near the cliff, whether shifting income (pre-tax 401(k) or HSA contributions lower MAGI) could preserve a subsidy, and what a raise actually costs after the subsidy claw-back.

Divide household MAGI by the poverty level for your household size (2025 guidelines govern 2026 coverage: $15,650 for one person plus $5,500 per additional person, 48 states + DC). That percentage maps to an applicable percentage between 2.10% and 9.96% — the share of income you're expected to pay toward the benchmark second-lowest-cost Silver plan. Your monthly subsidy is the benchmark premium minus that expected contribution, and it can be applied to any metal-tier plan. Outside the 100%–400% band, the credit is zero.

1. Estimate 2026 household MAGI. Adjusted gross income plus tax-exempt interest, untaxed Social Security, and excluded foreign income — for everyone in your tax household, not just the person enrolling.
2. Count your tax household. You, your spouse, and tax dependents — even family members with other coverage count for the poverty-level math.
3. Find your benchmark premium. The second-lowest-cost Silver plan for your household on HealthCare.gov or your state marketplace. It's shown during shopping; use an unsubsidized quote.
4. Read your position vs. the cliff. The result shows income as a percentage of FPL and your distance to 400%. Inside the band, you'll see your applicable percentage, monthly contribution, and subsidy.
5. Stress-test your estimate. Re-run with income 10% higher and lower. If a plausible bonus tips you past the cliff, plan MAGI reducers (401(k), HSA, IRA) before year-end, not at tax time.

• Letting auto-renewal set your subsidy. Carried-forward 2025 estimates use the old generous schedule; the same income yields a smaller 2026 credit and a surprise repayment at tax time.
• Counting only the enrollee's income. Household MAGI includes your spouse and dependents' taxable income even if they aren't on the marketplace plan.
• Forgetting the cliff is a cliff. There's no taper above 400% FPL in 2026 — one extra dollar can erase the entire credit.
• Using the wrong poverty table. 2026 coverage uses the 2025 poverty guidelines, and Alaska and Hawaii have their own higher figures.
• Ignoring Form 8962 reconciliation. Advance credits are trued-up against actual income on your tax return; report mid-year income changes to the marketplace promptly.

• If you're within a few thousand dollars of 400% FPL, pre-tax 401(k), traditional IRA, and HSA contributions directly reduce MAGI — often returning far more in subsidy than they cost.
• Self-employed? The health insurance premium deduction and the subsidy interact circularly; good tax software or a CPA handles the iteration.
• Between 100% and 150% FPL you may also qualify for cost-sharing reductions that slash deductibles — but only on Silver plans.
• Compare paying full price for Bronze against a subsidized Silver: over the cliff, a Bronze or catastrophic plan may be the rational fallback.
• Report income changes mid-year. A subsidy adjusted in July beats a four-figure repayment the following April.

The 2026 rules reward accurate forecasting and punish guesswork: contributions of 2.1%–9.96% of income inside the 100%–400% FPL band, and a sheer drop to zero outside it. Know your percentage of FPL, know your distance to the cliff, and use MAGI levers before December 31 rather than discovering the math on Form 8962. A half-hour with real numbers can be worth thousands.

• Income Tax Calculator — estimate the MAGI that drives your subsidy
• BMI Calculator — more health tools
• SALT Deduction Calculator — another 2026 federal tax change worth checking
• Retirement Calculator — pre-tax retirement savings also lower your MAGI

• HealthCare.gov — See plans and prices (healthcare.gov) — Find your local benchmark Silver premium
• IRS — Premium Tax Credit (irs.gov) — Official credit rules and Form 8962 reconciliation
• HHS — Poverty guidelines (hhs.gov) — Federal poverty levels by household size