CD Calculator — South Dakota 2026
Calculate Certificate of Deposit interest for South Dakota residents. South Dakota has no state income tax — CD interest is taxed at the federal level only.
Quick Answer
A $10,000 CD at 4.5% APY earns $459.63 in 12 months (monthly compounding) — ending at $10,459.63 before taxes. As a South Dakota resident with no state income tax, the $459.63 interest is only subject to federal income tax. CDs are FDIC-insured up to $250,000.
Your CD Details
CD Maturity Value — 1 Year
Final Balance
$10,459.40
Interest Earned
$459.40
Effective APY
4.594%
Your $10,000.00 deposit earns $459.40 in interest — a 4.59% total return. Interest is taxable as ordinary income in the year it is received or credited.
Growth Timeline
| Month | Interest This Period | Cumulative Interest | Balance |
|---|---|---|---|
| Month 1 | $37.50 | $37.50 | $10,037.50 |
| Month 3 | $37.78 | $112.92 | $10,112.92 |
| Month 6 | $38.21 | $227.12 | $10,227.12 |
| Month 9 | $38.64 | $342.61 | $10,342.61 |
| Month 12 | $39.08 | $459.40 | $10,459.40 |
CD Taxation in South Dakota
State income tax rate: 0%
CD interest taxed by South Dakota: No — no state income tax
Federal tax on CD interest: Yes — taxed at ordinary income rates (10%–37%)
1099-INT reporting: Your bank reports interest over $10 to the IRS and your state (if applicable)
South Dakota has no state income tax. CD interest faces federal tax only.
CD FAQs — South Dakota
How is CD interest taxed in South Dakota?
CD interest is taxed as ordinary income in South Dakota. South Dakota has no state income tax. CD interest faces federal tax only. At the federal level, CD interest is taxed at your marginal rate (10%–37%). Combined federal and South Dakota state tax on CD interest: 37% maximum (federal only — no state tax). Your bank will issue a 1099-INT for any interest over $10.
What is the best CD rate in South Dakota right now?
CD rates in South Dakota follow national market rates since they are set by banks and credit unions, not state governments. As of 2026, competitive CD rates range from 4.0% to 5.5% APY. Online banks typically offer higher rates than local branches. Check South Dakota-based credit unions for competitive local rates. The FDIC rate tracker and Bankrate provide current top CD rates available to South Dakota residents.
Are CDs FDIC-insured in South Dakota?
Yes — CDs at any FDIC-member bank are federally insured up to $250,000 per depositor, per institution, per ownership category. This applies equally to all South Dakota residents regardless of state laws. Credit union CDs are insured by the NCUA up to the same $250,000 limit. South Dakota residents can open CDs at any FDIC or NCUA-insured institution nationwide — in person or online.
Should I put my savings in a CD or a high-yield savings account in South Dakota?
The choice depends on your liquidity needs and rate expectations. CDs offer a guaranteed, locked-in rate — ideal if you won't need the money for a set period and want certainty. High-yield savings accounts are more flexible (no penalty for withdrawal) but rates can change. In South Dakota with no state income tax, both CDs and savings accounts benefit from the same state tax advantage — only federal taxes apply.
What is the early withdrawal penalty for CDs in South Dakota?
Early withdrawal penalties are set by individual banks, not by South Dakota state law. Common penalties: 3 months of interest for CDs under 1 year, 6 months of interest for 1–2 year CDs, and 12 months of interest for 3–5 year CDs. Some banks offer no-penalty CDs at slightly lower rates. Before opening a CD as a South Dakota resident, understand the penalty terms in case you need the funds before maturity.