What Is Second Lowest Cost Silver Plan (SLCSP)?
The one-minute explanation of second lowest cost silver plan (slcsp) — no jargon.
Second Lowest Cost Silver Plan (SLCSP): The second-cheapest Silver plan in your area — this specific plan's price is the benchmark that sets everyone's premium tax credit.
In Plain English
SLCSP is exactly what it sounds like: of all the Silver plans sold in your rating area, the second cheapest. Its price is the official benchmark for premium tax credits. Your Form 1095-A reports this number every month, and your Form 8962 uses it to reconcile your credit at tax time.
A Real Example
Your area has Silver plans at $520, $560, $590, and $640. The SLCSP is the $560 plan — that $560 is the benchmark. If your income says you should pay $200, your credit is $360/month. Next year the cheapest plans reshuffle and the new SLCSP is $610: your credit grows even if your income didn't change.
Why It Matters When You Shop
You don't have to buy the SLCSP — it's just the measuring stick. But knowing the benchmark helps you understand why your net prices moved. When clients ask "why did my premium change when nothing about me changed?", the answer is almost always the SLCSP.
Watch Out For
If you stay in the same plan year after year without checking, a shifting SLCSP can quietly erode your credit while your plan's price creeps up — a double hit. Annual review isn't optional; it's how you catch this.
Related: Benchmark Plan · Premium Tax Credit · Form 8962
Common Questions
Is the SLCSP the same plan every year? No — it's whichever plan happens to be second-cheapest Silver in your area that year. Carriers reprice annually, so the SLCSP identity changes often.
What if there are fewer than two Silver plans in my area? The Marketplace has fallback rules for thin markets — the benchmark is still computed, just with fewer data points. Your credit still works normally.
Does the SLCSP affect cost-sharing reductions? No — CSRs depend on your income and choosing Silver, not on the benchmark. The benchmark only drives the premium credit.
Put It to Work
Your 1095-A lists the SLCSP premium for each month — keep it with your tax documents. If you changed plans mid-year, you'll see different SLCSP figures by month, and that's normal: the benchmark follows your rating area, not your plan. When a tax preparer asks "what's the SLCSP?", point them to Part III of the 1095-A. And if you're the analytical type, tracking your area's SLCSP year over year tells you more about local market competition than any news article.
How I Explain It to Clients
"You don't buy the benchmark — it's just the ruler," I explain. "But when your premium jumps and nothing about you changed, the ruler moved." I check the SLCSP every fall for my clients because it explains 90% of mysterious premium changes, and understanding it turns confusion into a shopping strategy.
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