South Dakota Cliff Calculator — 2026 ACA Subsidy

By Severance Calculator Editorial · Updated

South Dakota Marketplace: HealthCare.gov

South Dakota uses a federally-facilitated marketplace (FFM) called HealthCare.gov. South Dakota residents enroll at HealthCare.gov.

Medicaid in South Dakota: South Dakota Medicaid (Expansion Adults)

South Dakota expanded Medicaid under the ACA. South Dakota Medicaid (Expansion Adults) covers adults to 138% FPL.

2026 SLCSP Benchmark Premiums (South Dakota)

Statewide average monthly second-lowest-cost Silver plan (SLCSP) premiums by age. Actual premiums vary by rating area.

Age2130405060
Monthly SLCSP$420$476$537$750$1,140

2026 ACA Cliff Thresholds by Household Size (South Dakota)

MAGI above these amounts zeros out the federal Premium Tax Credit. FPL region: contiguous48.

Household size12345
400% FPL cliff$62,600$84,600$106,600$128,600$150,600

Key Facts: South Dakota ACA

South Dakota became the most recent state to implement Medicaid expansion, following a voter-driven constitutional amendment. In November 2022, South Dakota voters approved Amendment D, embedding the ACA's Medicaid expansion into the state constitution with approximately 56% of the vote — making it among the highest margins for any state ballot expansion. Implementation began July 1, 2023, under Governor Kristi Noem, who had opposed expansion but was constitutionally obligated to implement it.

Approximately 52,000 low-income South Dakotans were expected to gain coverage through the expansion. As of March 2025, 31,202 adults were enrolled — lower than initial projections, reflecting a common enrollment ramp-up pattern in newly expanded states. Adults earning up to 138% FPL who previously fell into the coverage gap now qualify for South Dakota Medicaid.

South Dakota uses HealthCare.gov (FFM) for marketplace enrollment and has no state-funded premium subsidy backfill for 2026. The enhanced PTCs under the American Rescue Plan expired December 31, 2025, and South Dakota residents above 400% FPL receive no premium assistance in 2026.

Calculate your South Dakota ACA cliff

Inputs default to South Dakota; adjust to your household specifics. Cliff = $62,600 (HH=1) / $128,600 (HH=4).

Your situation

Member ages
self

Coverage

Income

You're under the cliff

100%138%200%300%400%

You are at 319% of the federal poverty level.

Annual PTC
$2,220
$185 / month
MAGI headroom before cliff
$12,600
until you hit 400% FPL

PTC dollar values use a state-level SLCSP estimate; verify your exact second-lowest-cost Silver plan on healthcare.gov for your zip.

Primary Sources

  1. healthinsurance.org — South Dakota Marketplace
    “The ACA's Medicaid expansion took effect in South Dakota in mid-2023 following voter approval in the 2022 election.”

FAQ — South Dakota ACA Cliff

What is the 2026 ACA subsidy cliff in South Dakota?
For a household of 1, MAGI above $62,600 (400% of the 2025 FPL contiguous-48 base) zeros out the federal Premium Tax Credit under IRS Rev. Proc. 2025-25. Household of 4: $128,600. South Dakota has no state subsidy backfill, so crossing this threshold eliminates all premium assistance.
What was South Dakota Amendment D (2022)?
Amendment D was a constitutional ballot initiative approved by South Dakota voters in November 2022 with approximately 56% of the vote. It embedded the ACA's Medicaid expansion into the South Dakota Constitution, requiring coverage for adults earning up to 138% FPL. Implementation began July 1, 2023 — making South Dakota the most recent state to implement Medicaid expansion.
How many people have enrolled in South Dakota's Medicaid expansion?
As of March 2025, approximately 31,202 adults were enrolled in South Dakota's Medicaid expansion, lower than the initial projection of 52,000 eligible residents. Enrollment continues to ramp up as residents become aware of eligibility — a pattern common in newly expanded states.
How do I enroll in 2026 marketplace coverage in South Dakota?
South Dakota uses HealthCare.gov (the federal FFM marketplace). Open enrollment runs November 1 through January 15. To apply for South Dakota Medicaid (including the expansion), visit dss.sd.gov year-round.
Does South Dakota have a state subsidy on top of the federal PTC?
No. South Dakota has no state-funded premium subsidy backfill for 2026. Residents rely entirely on federal APTC, which ends above 400% FPL ($62,600 for HH=1). The American Rescue Plan enhanced PTCs expired December 31, 2025.
How is SLCSP calculated for South Dakota?
The 2026 statewide SLCSP age-band averages for South Dakota are: Age 21: $420/mo, Age 30: $476/mo, Age 40: $537/mo, Age 50: $750/mo, Age 60: $1,140/mo. These are statewide averages; your specific county may vary. The federal cliff distance (income vs. 400% FPL) is exact regardless of SLCSP precision.
Can I reduce my MAGI to stay below the 2026 cliff in South Dakota?
Yes — common strategies include maximizing HSA contributions, deductible IRA or SEP-IRA/Solo 401(k) contributions if self-employed, harvesting capital losses, and deferring Roth conversions. Because South Dakota has no state subsidy above 400% FPL, staying below the federal cliff has full dollar impact.

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