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Locking money up in South Dakota
CD rates are set nationally and the best offers are available to savers in every state, so geography barely touches the headline number. What South Dakota does change is what you keep: state income tax on interest, and which credit unions you are eligible to join.
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In South Dakota
State figures
What changes at the state line
What South Dakota controls, and what it does not
Much of this market is federal and identical everywhere. These are the parts your state actually decides — worth checking before you assume a national figure applies to you.
State tax on interest
Nine states levy no individual income tax on interest at all. Everywhere else, some of your yield goes to the state as well as the IRS.
Credit union eligibility
Membership is often tied to where you live or work. Local credit unions frequently pay well above national bank averages.
Treasury alternatives
Interest on U.S. Treasury securities is exempt from state and local income tax, which shifts the comparison against a CD in high-tax states.
State-chartered institutions
Which banks and credit unions compete for deposits locally differs, and local competition affects the rates you are offered.
After tax
What South Dakota takes of your interest
South Dakota is one of nine states with no individual income tax on interest income, so deposit interest is taxed federally but not by the state. The usual advantage of Treasury securities — exemption from state and local income tax — therefore does not apply to you, which makes the straight rate comparison between a CD and a Treasury simpler here than in most states.
Tax treatment depends on your own circumstances and on rules that change. This is general information, not tax advice — confirm your position with a tax professional before acting on it.
By the numbers
The national picture
These figures apply nationwide, including in South Dakota. They are the benchmark to measure any offer against.
| Measure | Figure | Source |
|---|---|---|
| 1-year CD, national average | 1.65% | FDIC, mid-June 2026 |
| 5-year CD, national average | 1.35% | FDIC, mid-June 2026 |
| Best widely available | ~4.30% | Bankrate / Forbes Advisor, July 2026 |
| Federal funds target | 3.50–3.75% | FOMC, July 2026 |
Published state-level averages for these products vary considerably between data providers, so we show national benchmarks rather than a state figure we cannot stand behind. Where a verified South Dakota figure is available it appears above.
Work it out
Average rate against best available
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What shopping around is worth
- Interest at the average
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- Interest at the best rate
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- Difference
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Free and official
Where to check things in South Dakota
None of these charges anything, and none of them is selling you a product.
State regulator
South Dakota Division of Banking
Licenses lenders and financial institutions operating in South Dakota, and holds a searchable register you can check a company against before applying.
Visit →Federal
Consumer Financial Protection Bureau
Takes complaints about lenders, card issuers, banks, and collectors nationwide, and requires a response. Also publishes plain-language guidance.
consumerfinance.gov →State
South Dakota attorney general
Handles consumer complaints locally and can act on practices affecting residents of South Dakota specifically.
Your credit file
annualcreditreport.com
The federally authorised source for free reports from all three bureaus. Checking your own file is a soft inquiry and has no effect on your score.
Get your reports →Go deeper
The full cds & investments guide
The national guide covers the mechanics in detail — the decoder, the full data, and the complete calculator.
Go deeper
Look up your state
Rules, caps, and protections differ across state lines. Pick another state to see what applies there.
Common questions
Questions South Dakota readers ask
Are CD rates different in South Dakota?
Barely. The most competitive CDs are offered nationally by online banks and credit unions, and a saver in South Dakota can generally open them. Local institutions sometimes beat national rates, which is worth a check, but geography is not the main variable — shopping around is.
Do I pay South Dakota tax on CD interest?
Deposit interest is taxable federally as ordinary income everywhere. Whether your state taxes it too depends on the state, and it changes the after-tax comparison against Treasury securities, whose interest is exempt from state and local tax. Speak to a tax professional about your position.
Is a CD insured in South Dakota?
Deposit insurance is federal and identical in every state — FDIC at a bank, NCUA at a credit union, up to the standard limit per depositor, per institution, per ownership category. Verify any institution on the FDIC or NCUA website before depositing.
Where these numbers come from
Sources
- 1-year CD, national averageFDIC, mid-June 2026
- 5-year CD, national averageFDIC, mid-June 2026
- Best widely availableBankrate / Forbes Advisor, July 2026
- Federal funds targetFOMC, July 2026
- State rulesState statutes on consumer lending, interest rate caps, limitation periods, and garnishment; state banking and financial regulation departments.
How this page is made
This is an educational reference page. It does not rank, score, rate, or recommend any company, policy, or program, and nothing here is an offer of coverage or credit.
Figures are national averages published by the sources listed above. Averages describe a market, not a person — your own numbers depend on details an average cannot see. Where published estimates disagree, we show the disagreement rather than picking one.
Brandcomparisons.org is not an insurer, lender, insurance agency, debt relief provider, or financial adviser, and is not a government agency. Last reviewed August 2026. Spot something out of date? Tell us and we will correct it.