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South Dakota has no state tax break for 529 contributions, so you can pick any state's plan on fees and investments alone. Here are the facts on South Dakota's direct-sold 529 plan (the one you open yourself, without an advisor).
No state income tax.
Summary of state law from the ICI 2025 state tax survey; it may predate 2026 changes.
2026 limits and parity: Savingforcollege. Manager, fees and minimum: only when stated on the plan's homepage text we read (2026-10-12); otherwise 'not found'. Check the plan's disclosure document for exact fees.
No state tax break for 529 contributions.
No. You can use any state's plan; you may lose your state's tax break if your state doesn't offer tax parity.
Estimates, not financial advice. Taxes, insurance, PMI and fees vary by lender, county and city; confirm with your lender, dealer and state agency before acting.