South Dakota 529 plan: no state income tax, what counts in 2026
One state-sponsored plan, mostly sold through advisors, and a tax return with no line for it.
In the 529 at age 18
$46,550
$0 more than the same money in a taxable account, plus $0 of South Dakota tax saved along the way.
| You put in | $31,200 |
| Growth, tax-free for school costs | $15,350 |
| Taxable account after tax | $46,550 |
| South Dakota tax saved, 13 years | $0 |
Taxable account: dividends taxed every year and the remaining gain taxed at sale, at the 2026 federal capital gains rate for this income, NIIT where it applies, and your state marginal rate.
| Year | Child’s age | Put in | 529 balance |
|---|---|---|---|
| 3 | 8 | $7,200 | $7,849 |
| 6 | 11 | $14,400 | $17,196 |
| 9 | 14 | $21,600 | $28,330 |
| 12 | 17 | $28,800 | $41,590 |
| 13 | 18 | $31,200 | $46,550 |
Worked out by Radif Partners · How we calculate · South Dakota rule read on October 19, 2026, brackets of tax year 2026 · not tax advice
South Dakota does not tax wages, so contributing to a 529 changes nothing on a state return: there is no deduction, no credit and, later, nothing to give back when money comes out. The state sponsors one program, CollegeAccess 529, which is sold through financial professionals and, for South Dakota residents only, also offers a way to invest directly. Accounts for the same beneficiary stop accepting new money at $350,000. The tax value of a 529 in South Dakota is entirely federal: growth is not taxed while invested, and withdrawals for qualified costs come out tax-free, including up to $20,000 a year of K-12 costs per child from 2026. A Sioux Falls couple who save $200 a month from a child's fifth birthday would have about $46,550 at 18, assuming a 6 % yearly return, against $46,550 in a taxable account after federal tax. Any other state's plan can be used with no state tax cost.
| State income tax on wages | None |
|---|---|
| Benefit for contributions | None (no income tax) |
| State plans (official names, no recommendation) | CollegeAccess 529 |
| Account balance limit | $350,000 |
CollegeAccess and its two doors
The South Dakota Department of Revenue lists no individual income tax among the taxes it collects, and the CollegeAccess 529 FAQ describes the plan as sponsored by the State of South Dakota. Most of its share classes are sold through financial professionals. The plan's home page also mentions a direct option for South Dakota residents only, with resident share classes; the plan does not publish it under a separate plan name, so we refer to it simply as the residents' direct option.
The plan highlights page sets the ceiling at $350,000 per beneficiary. Past that level new contributions are refused, though market gains can carry the balance higher.
Thirteen years of saving, with no state line on the return
With no South Dakota income tax on either side, the comparison between a 529 and a regular brokerage account is a purely federal one. The couple saving $200 a month put in $31,200 over thirteen years. At a 6 % return, an assumption and not a forecast, the 529 holds $46,550, of which $15,350 is growth that stays untaxed if it pays for school. In a taxable account the same deposits would leave $46,550 after federal tax on dividends each year and on the gain at sale.
A South Dakota account with savings already in it
In the 529 at age 18
$58,589
| You put in | $45,800 |
| Growth, tax-free for school costs | $12,789 |
| Taxable account after tax | $58,589 |
| South Dakota tax saved, 7 years | $0 |
Why parity and recapture do not come up
In states with an income tax, families weigh the home plan's deduction against fees elsewhere, and worry about an add-back if the account later moves. South Dakota residents have neither concern. Another state's direct plan costs them nothing on a state return, and rolling a CollegeAccess account into a different plan triggers no South Dakota tax, because nothing was ever deducted. The choice rests on fees, investment menus and how the account is bought, which each plan prints in its disclosure.
A move east changes the arithmetic
If the family relocates to a state that taxes income, new deposits may start earning something, and the rule of the new state decides how much. Using its own plan, the couple at $80,000 putting $2,400 a year in would save $91 in Iowa. In Nebraska, keeping the CollegeAccess account and adding to it there would save $0, since Nebraska counts only its own plan. The existing balance can stay in CollegeAccess or be rolled over; the out-of-state plan page walks through that decision, and the 529 calculator projects the balance from any starting age.