The second-lowest-cost silver plan, often shortened to SLCSP, is the benchmark Marketplace plan the government uses to size your Affordable Care Act premium tax credit. Your subsidy equals that plan’s monthly premium minus the share of income you’re expected to contribute, and the figure stays anchored to the benchmark no matter which plan you actually buy. Pick Bronze, Gold, or a different Silver plan, and the credit amount doesn’t move.
How the Benchmark Sets Your Credit
The premium tax credit formula has two moving parts. The first is the monthly premium of the second-lowest-cost silver plan available to your coverage family in your area. The second is your expected contribution, calculated as a percentage of household income that rises on a sliding scale as income climbs relative to the federal poverty level.1U.S. Government Publishing Office. 26 USC 36B – Refundable Credit for Coverage Under a Qualified Health Plan Subtract the second from the first and you have your monthly credit.
Say the SLCSP in your area costs $500 a month, and your income puts your expected contribution at $200. Your credit is $300. Buy a Bronze plan at $350 and you pay $50 out of pocket. Buy a Gold plan at $600 and you pay $300. The $300 credit doesn’t change with the plan you select; only the benchmark feeds the math.
Because the benchmark is a specific plan in a specific place, two households with identical incomes in different counties can receive very different subsidies. When benchmark premiums rise in your area, your credit grows with them. When they fall, it shrinks.
Where to Find Your SLCSP Premium
If anyone in your household had Marketplace coverage during the year, Form 1095-A arrives by mid-February. Part III of the form has three columns, and Column B is the SLCSP: the monthly benchmark premium for each month you were enrolled.2HealthCare.gov. How to Use Form 1095-A, Health Insurance Marketplace Statement If every month shows a dollar amount, carry those figures to Form 8962 when you file.
Column B is sometimes blank or shows zero. When that happens, the Marketplace provides a tax tool at healthcare.gov/tax-tool that generates the correct monthly premiums.3HealthCare.gov. Health Coverage Tax Tool You enter your zip code and county for each month, plus the names and birthdates of everyone covered under the policy. The tool returns a month-by-month list of SLCSP premiums that replaces whatever appeared, or didn’t appear, in Column B. State-based exchanges may offer their own version.2HealthCare.gov. How to Use Form 1095-A, Health Insurance Marketplace Statement
What Determines the Benchmark Amount
Several variables drive the number in Column B. Your geographic rating area, typically defined by county or a combination of zip codes, controls which insurers and plans are available in the first place.4Centers for Medicare & Medicaid Services. State Specific Geographic Rating Areas Premiums also reflect the ages of everyone in the coverage family, since older enrollees pay more. A 60-year-old and a 30-year-old living in the same zip code will see different SLCSP premiums even with identical incomes.
The coverage family itself is narrower than your household. It only includes members enrolled in a Marketplace plan who are not eligible for other minimum essential coverage. If someone in your household gains access to Medicare, Medicaid, CHIP, or qualifying employer-sponsored insurance, they drop out of the SLCSP calculation for those months.5Internal Revenue Service. Publication 974 (2025), Premium Tax Credit (PTC)
Life Changes That Shift the Benchmark Month to Month
Your SLCSP is not locked in for a full year. Each month gets its own calculation, so a mid-year change produces a different benchmark for the months that follow.
Moving to a new zip code or county is one of the most common triggers. Insurance markets are local, and the second-lowest-cost silver plan in your new area may cost significantly more or less than in your old one. A move also qualifies you for a special enrollment period, giving you 60 days to pick a new plan.6HealthCare.gov. Getting Health Coverage Outside Open Enrollment
Changes in household composition reset the benchmark too. Having a baby, getting married or divorced, or adding a dependent all change who the reference plan has to cover. Adding a family member generally raises the SLCSP premium; losing one lowers it. The Marketplace guidance says to report these changes right away, and special enrollment periods generally give you 60 days from the qualifying event to adjust your plan.6HealthCare.gov. Getting Health Coverage Outside Open Enrollment
Each month also has to be evaluated separately when someone picks up or loses other coverage. The benchmark in March, when your spouse had no employer offer, may be very different from the benchmark in April after your spouse started a job with benefits.
Why Getting the SLCSP Right Matters More in 2026
Two rule changes raise the stakes for the 2026 tax year. The income cap for premium tax credits is back at 400 percent of the federal poverty level. From 2021 through 2025 there was no hard cutoff; households above 400 percent of FPL still qualified if their benchmark premium exceeded 8.5 percent of income. That expansion expired on January 1, 2026.7Internal Revenue Service. Questions and Answers on the Premium Tax Credit For 2026, a single person earning more than $63,840 or a family of four earning more than $132,000 loses all subsidy eligibility.8U.S. Department of Health and Human Services. 2026 Poverty Guidelines The cliff is abrupt. One dollar over costs you the entire credit.
The second change: there’s no repayment cap. Through 2025, taxpayers who received too much in advance credits had their repayment capped at amounts ranging from $375 to $3,250 depending on income and filing status. Starting with tax year 2026, Section 71305 of Public Law 119-21 eliminated the limitation entirely.9Office of the Law Revision Counsel. 26 USC 36B – Refundable Credit for Coverage Under a Qualified Health Plan If your advance credits exceed what you were actually entitled to, you owe back every dollar of the difference.7Internal Revenue Service. Questions and Answers on the Premium Tax Credit
Together these changes mean an incorrect SLCSP figure, an unreported move, or a baby you forgot to add can translate directly into a sizable tax bill. Catching a bad Column B figure before you file is far easier than amending a return later.
The Silver-Only Side Benefit: Cost-Sharing Reductions
The benchmark sets your credit no matter which metal tier you choose, but one financial advantage is only available if you actually enroll in a Silver plan. Cost-sharing reductions lower your deductibles, copays, and out-of-pocket maximums, effectively upgrading a standard Silver plan. Enroll in Bronze or Gold and you forfeit the reductions, even if your income qualifies.10HealthCare.gov. Cost-Sharing Reductions
Eligibility runs from 100 percent to 250 percent of the federal poverty level. At the lower end of that range, a Silver plan with cost-sharing reductions can rival Platinum-level coverage in what you actually pay when you see a doctor or fill a prescription. If your income falls in that band, picking a cheaper Bronze plan can save you on premiums but cost far more the first time you need care.