CD Calculator — Montana 2026
Calculate Certificate of Deposit interest for Montana residents. Montana taxes CD interest at up to 5.9% state income tax.
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 Montana resident, the $459.63 interest is subject to federal income tax plus Montana state income tax at up to 5.9%. 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 Montana
State income tax rate: 4.7–5.9%
CD interest taxed by Montana: Yes — taxed as ordinary income at up to 5.9%
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)
Montana taxes CD interest at rates up to 5.9%.
CD FAQs — Montana
How is CD interest taxed in Montana?
CD interest is taxed as ordinary income in Montana. Montana taxes CD interest at rates up to 5.9%. At the federal level, CD interest is taxed at your marginal rate (10%–37%). Combined federal and Montana state tax on CD interest: up to 42.9% for top earners. Your bank will issue a 1099-INT for any interest over $10.
What is the best CD rate in Montana right now?
CD rates in Montana 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 Montana-based credit unions for competitive local rates. The FDIC rate tracker and Bankrate provide current top CD rates available to Montana residents.
Are CDs FDIC-insured in Montana?
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 Montana residents regardless of state laws. Credit union CDs are insured by the NCUA up to the same $250,000 limit. Montana 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 Montana?
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 Montana with a 5.9% state tax rate, both CD and savings account interest are taxed identically as ordinary income.
What is the early withdrawal penalty for CDs in Montana?
Early withdrawal penalties are set by individual banks, not by Montana 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 Montana resident, understand the penalty terms in case you need the funds before maturity.