Head-to-head, from CMS Plan Year 2026 data.
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Indiana is the cheaper of the two: a 40-year-old pays about $558/month for the median Silver plan, versus $725 — a difference of $167/month (30%) before subsidies.
| Indiana | South Dakota | |
|---|---|---|
| Median Silver @40 | $558 | $725 |
| Cheapest Silver @40 | $440 | $512 |
| Most expensive county @40 | $699 | $882 |
| Age 27 | $361 | $420 |
| Age 60 | $934 | $1,087 |
| Carriers | 5 | 3 |
| Counties | 92 | 66 |
| 1-carrier counties | 0 | 0 |
| Plan types | EPO, HMO, POS | EPO, HMO, PPO |
Network note: Indiana has no PPO plans in 2026 while South Dakota does. If you work across county or state lines that difference matters more than the premium gap.
Source: CMS Plan Year 2026 Qualified Health Plan Landscape. Full-price filed rates before premium tax credits; not a quote or an offer of coverage.
This page sets two states against each other. For county-by-county carriers, plan data and help actually enrolling, I publish a page for each state on Coverage by County: Indiana or South Dakota. There is also a blog covering deductibles, subsidies and special enrollment periods.
Put your ZIP code in and I will show you the carriers filing in your county, what the cheapest plan costs, and what you would actually pay after any help you qualify for. No cost, and you talk to me — not a call center.
Moving permanently from Indiana to South Dakota is a qualifying life event, so you get a 60-day special enrollment window counted from the move date — time enough to work through the 3 carriers filing in South Dakota without waiting for open enrollment. Two conditions trip people up: you generally need to have held qualifying coverage for at least one day in the 60 days before the move, and relocating purely for treatment or a holiday will not qualify.
Coverage does not port across the state line. Ending in Indiana and starting in South Dakota is two separate transactions, and the plan you end up with in South Dakota is priced on its own county, not on what you paid before.
The carrier lists do not intersect — 5 in Indiana, 3 in South Dakota, none shared. Expect to start a relationship with a new insurer, likely one of Avera Health Plans and Sanford Health Plan.
This is the asymmetry that bites. South Dakota has PPO plans across all 66 counties; Indiana sells none in any of its 92. The PPO is the plan type most likely to pay outside its own network, so heading toward Indiana usually costs you the ability to see South Dakota providers for anything short of an emergency.
Splitting the year does not mean splitting the coverage. You can hold a marketplace plan only in your state of primary residence — the address you file from — not one in Indiana and another in South Dakota. The cost lands on care received in whichever of the two you did not choose.
State averages hide enormous county-level spread. Whichever of Indiana or South Dakota you are in, your ZIP is what sets your premium.