Question 1

What is the Premium Tax Credit and how is it calculated?

Accepted Answer

The Premium Tax Credit (PTC) under IRC §36B is a refundable federal tax credit that subsidizes ACA marketplace plan premiums for households between 100% and 400% of the Federal Poverty Level (with extended eligibility for households above 400% FPL via the affordability cliff fix in the Inflation Reduction Act / IRA through 2025). The formula: PTC = (premium of second-lowest-cost silver plan in your area) − (applicable percentage of household income). The applicable percentage scales from 0% at 100% FPL up to 8.39% at 400% FPL (2024 value, indexed). For 2024 ACA marketplace open enrollment, the IRA extended subsidies past 2024 through tax year 2025; post-2025 the affordability cliff returns unless Congress extends.

Question 2

What's the 'second-lowest-cost silver plan' benchmark and why does it matter?

Accepted Answer

Per IRC §36B(b)(3)(B), the PTC is benchmarked to the second-lowest-cost silver plan (SLCSP) available to you in the marketplace — NOT the silver plan you choose, and NOT the cheapest plan, and NOT a gold or bronze plan you might prefer. This is a deliberate design choice: it lets you 'shop down' to a bronze plan and pocket the difference, or 'shop up' to a gold plan and pay the difference, while keeping the subsidy fixed. The SLCSP varies by your zip code, age, and tobacco status — the calculator pulls the current-year SLCSP based on your inputs to compute the actual PTC.

Question 3

How do I figure out my expected out-of-pocket costs for a plan?

Accepted Answer

Out-of-pocket is the part where most online plan comparisons go wrong, because it depends on YOUR usage pattern, not the plan's printed maximums. The calculator math: estimate annual claims volume (low / typical / high based on your last 2-3 years of medical usage), then apply the plan's structure: (a) claims up to the deductible: you pay 100%; (b) claims after the deductible until the OOP max: you pay the coinsurance percentage (typically 20-30%); (c) claims above the OOP max: plan pays 100%; (d) routine care with fixed co-pays falls outside this stack. For a household with $3K of typical annual claims and a $5K deductible + $7,500 OOP max plan, expected OOP is ~$3K (under the deductible). For the same household on a $1K deductible + $6K OOP max plan, expected OOP is ~$1K + 20% × $2K = ~$1,400 — meaningfully lower.

Question 4

What's metallic tier (Bronze / Silver / Gold / Platinum) and how does it affect math?

Accepted Answer

ACA marketplace plans are categorized by actuarial value (AV) — the percentage of total covered medical costs the plan pays on average for a standard population. Bronze: ~60% AV (you pay ~40%). Silver: ~70% AV. Gold: ~80% AV. Platinum: ~90% AV. Higher AV = higher premium but lower out-of-pocket per claim. The PTC subsidy is benchmarked to silver, so bronze plans typically have the lowest net premium after subsidy (sometimes $0 for low-income households), while gold/platinum plans have higher net premiums but lower expected OOP. The calculator lets you compare any two metallic tiers head-to-head on total annual cost (premium + expected OOP) rather than just headline premium.

Question 5

What about Cost Sharing Reductions (CSR) below 250% FPL?

Accepted Answer

Per IRC §1402 of the ACA (Sec. 1402, 42 USC §18071), households below 250% of FPL who enroll in a silver plan also qualify for Cost Sharing Reductions (CSR) — enhanced silver plans that effectively have gold-or-platinum AV at silver-level premium. Three CSR tiers: 73% (200-250% FPL), 87% (150-200% FPL), 94% (100-150% FPL or eligible Native American households at any income). The CSR is automatic if you choose a silver plan and your household income falls in range; you don't apply separately. The calculator surfaces the CSR-enhanced silver plan if your inputs qualify, because it's typically the highest-value option for low-to-mid income households — but only if you choose silver. Bronze + CSR doesn't exist; CSR is silver-only.

Question 6

Does this calculator handle the family-glitch fix or short-term plans?

Accepted Answer

Family-glitch fix: YES (in scope). Per the 2022 Treas. Reg. §1.36B-2(c)(3)(v) amendment, the family-coverage affordability test now applies separately from employee-only coverage for purposes of family PTC eligibility. The calculator handles this when household members have access to employer coverage but the family premium fails the 9.12% affordability test (2024 threshold). Short-term plans: NO (out of scope). Short-term limited-duration insurance (STLDI) is not an ACA-compliant plan and doesn't carry the §36B PTC. Catastrophic plans for under-30 enrollees are also out of scope. This calculator focuses on the standard marketplace QHP (Qualified Health Plan) tiers.

Question 7

What about HSA-eligible plans?

Accepted Answer

HSA-eligible High-Deductible Health Plans (HDHPs) are typically bronze-tier ACA marketplace plans meeting the IRC §223(c)(2) HDHP definition: minimum $1,650 self-only / $3,300 family deductible (2025) and maximum $8,300 self-only / $16,600 family OOP (2025). The calculator surfaces whether each plan you're comparing is HSA-eligible (a binary tag from the marketplace plan data). HSA-eligible plans have a separate tax-advantage stack: pre-tax HSA contributions up to the §223 limit ($4,300 self-only / $8,550 family in 2025) reduce both income tax AND FICA tax. The calculator does NOT model the HSA tax benefit — that's a separate optimization. But it tags HSA-eligibility so you know which plans to consider for the HSA stack.

Question 8

Does this calculator tell me which plan to pick?

Accepted Answer

No — by design, and consistent with how Bedrocka Tools handles all YMYL-Insurance content. This calculator produces two outputs: (1) your PTC amount given your inputs, so you know your subsidized premium; (2) total-annual-cost comparison of two specific plans you're considering, so you see premium + expected OOP side-by-side rather than premium alone. The decision of WHICH plan to pick depends on factors this calculator does not model: provider network match to your existing doctors, formulary match to your prescriptions, plan-specific quality ratings, customer service reputation, claim-handling history, and your tolerance for OOP risk vs premium certainty. For plan selection consult a licensed health insurance broker — they don't charge you (commission is paid by the carrier) and they can verify your providers and prescriptions are covered before you enroll.

ACA Marketplace Plan Cost Calculator

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Frequently asked questions