SLCSP is the second lowest cost Silver plan available to a household in its Marketplace rating area for a given coverage year. The IRS uses the SLCSP premium as the benchmark when it calculates the premium tax credit on Form 8962. That sentence is the entire definition. The rest of this post is the parts of the definition that trip brokers and consumers up.
The most common confusion is the word “available.” SLCSP is not a national number, not a state number, and not a number that depends on the plan the household actually buys. It is rating area specific, household specific, and tier specific. Change any of the three and the SLCSP number changes with it.
Key Takeaways
- SLCSP is the second lowest cost Silver plan in the household rating area for the coverage year.
- It is the IRS benchmark on Form 8962, no matter which plan the client actually buys.
- SLCSP is household specific because Silver premiums depend on ages and tobacco status.
- Carrier exits and new filings can move SLCSP year over year. Cached numbers go stale.
- Line 11 of Form 1095-A is the source of truth at tax time.
What “rating area” actually means
A rating area is how the Marketplace groups counties (and sometimes ZIP codes) into a single pricing zone. CMS publishes the boundaries per state. Florida has 67 counties spread across multiple rating areas. Texas has 26 rating areas. Some states are a single rating area. Every Silver plan a household sees is the Silver plan filed for the rating area its ZIP rolls up to.
The practical implication is that two households with identical income and identical household composition can have different SLCSP numbers if they live in different rating areas. A client moving from Broward to Miami-Dade may be jumping rating areas without realizing it. The quoting tool should detect the move and refresh. Most do not unless the broker explicitly re-runs the quote.
Why “second lowest,” not lowest
Congress picked the second lowest Silver as the benchmark when the ACA premium tax credit math was written into law. The logic was that anchoring to the cheapest Silver in each market would push every carrier to compete on a single bottom price, which would crater plan diversity. Anchoring to the second cheapest gives carriers room to offer a mid-priced plan with a meaningfully different network without making the math harder.
Whether the legislative reasoning has aged well is a separate question. The mechanical answer for brokers and consumers is that the IRS uses second lowest, full stop. The plan the household actually buys can be any metal tier. The credit math still references SLCSP.
How SLCSP gets picked, step by step
Inside a rating area, the Marketplace ranks Silver tier plans by the household premium. The household premium reflects ages, tobacco use where allowed, and family composition. Then it picks rank 2.
A worked example for a hypothetical 35 year old in FL Rating Area 22, non tobacco, MAGI $42,000:
| Rank | Silver plan | Monthly premium | Broker note |
|---|---|---|---|
| 1 | Florida Blue myBlue HMO 1416 | $472 | Lowest cost Silver. Skipped over by the benchmark math. |
| 2 | Ambetter Balanced Care 11 | $498 | This is SLCSP. The IRS uses $498 as the benchmark. |
| 3 | Aetna CVS Health Silver Choice | $515 | Same family rating, slightly broader network. |
| 4 | Oscar Standard Silver 4 | $541 | Carrier entered the rating area in 2026. |
The cheapest Silver is $472. The IRS does not use $472. SLCSP is $498, the Ambetter Balanced Care 11. If this household buys the Aetna Silver Choice at $515, the credit math still references the $498 benchmark. If the household buys a Bronze plan at $310, the credit math still references the $498 benchmark. The benchmark does not move when the household picks differently.
When SLCSP shifts year over year
Four things move SLCSP between coverage years. A carrier exits the rating area, removing several Silver plans from the ranked list. A carrier enters with a low filed rate that becomes the new second cheapest. The state regulator approves a base rate change that ripples across the whole tier. Or CMS reclassifies a plan from Standard Silver to Silver Expanded, changing what counts in the rank.
In Florida Rating Area 22 for 2026, the Oscar entry shifted the rank 2 plan slightly. The Ambetter premium did not move much, but the broader plan list got more competitive, which pushed projected APTC higher for some households. The same family who got a $214 net Silver premium projection in October may see $189 once the new filings land. Brokers who refresh quotes catch the shift. Brokers who quote from a cached SLCSP do not.
Where to find SLCSP at tax time
Line 11 of Form 1095-A. The IRS populates Column B with the SLCSP premium for each month the household had coverage. The household uses that number on Form 8962 to reconcile the advance premium tax credit against the final premium tax credit owed.
If line 11 is blank, the IRS provides a separate SLCSP lookup tool on Healthcare.gov for the relevant coverage year. The tool accepts rating area and household composition and returns the same number the IRS would have populated. Both paths land on the same answer.
Common mistakes brokers make with SLCSP
Three patterns show up over and over. Quoting with last year's SLCSP. The tool cached the November 2025 number into December and the broker did not notice the January refresh. By February, the cached number is the wrong number for many rating areas.
Assuming SLCSP equals second cheapest Silver in the plan finder UI. The UI ranks plans by base premium for a sample household. SLCSP is the second cheapest for the actual household, which can be a different plan once ages, tobacco status, and family composition are applied.
Confusing SLCSP with the plan the client picks. SLCSP is a benchmark, not a selection. The client can buy any metal tier and the credit math still references SLCSP. Brokers who explain this once to a client save themselves three follow up calls in February.
What to do with this
Two things, for brokers. Use a quoting tool that refreshes SLCSP from live CMS data on every quote, not a cached snapshot. And explain to clients in the quote conversation that the credit math does not change if they pick a different plan. The pillar with the side by side lookup is the SLCSP calculator. The full APTC walkthrough is the APTC calculator. For how APTC differs from CSR on Silver plans, see APTC vs CSR for brokers. When carrier filings change plan IDs mid year, see how to read a CMS Marketplace plan ID. For the broader subsidy picture, see the ACA subsidy calculator.
FAQ
What brokers ask when SLCSP shows up on a quote or at tax time.
Does a client have to enroll in the SLCSP plan?
No. SLCSP is a benchmark for APTC math, not a plan recommendation. The household can enroll in any eligible Marketplace metal tier. Form 8962 still uses the SLCSP premium from the coverage year when reconciling the advance credit.
How is SLCSP different from the plan the client actually picks?
SLCSP is always a Silver plan in the household rating area for the coverage year. The enrolled plan can be Bronze, Gold, or Platinum. APTC is calculated from SLCSP even when the client buys a different tier.
Where does SLCSP show up at tax time?
Line 11 on Form 1095-A reports the SLCSP premium used for the household. That value feeds Part II of Form 8962 when the client reconciles advance APTC against actual income.
Why does SLCSP change when carriers exit a rating area?
SLCSP is the second lowest cost Silver plan filed for the year. When a carrier pulls plans or a new Silver enters the market, the second place plan can change. Cached SLCSP from an earlier month may no longer match CMS filings.
Can two households with the same income have different SLCSP values?
Yes. SLCSP depends on rating area, member ages, and tobacco status on the application. Income alone does not set the benchmark premium.
