What are the best CD rates in Connecticut right now?

As of May 2026, the best CD rates available to Connecticut residents reach approximately 4.50%–4.75% APY at online banks including Ally, Marcus, and Discover Bank. Connecticut has several strong community banks and credit unions, including Ion Bank and CUES (Connecticut credit unions) with competitive share certificate rates. Rates change frequently — verify before opening.

Is CD interest taxable in Connecticut?

Yes. Connecticut taxes CD interest as ordinary income at rates from 3% to 6.99% in 2026. Most middle-income CT residents pay 5% or 5.5% state income tax on CD interest. Connecticut's rates are moderate but meaningful — high enough that Treasury bills (state tax exempt) are worth comparing.

What is Connecticut's income tax rate on CD interest for typical earners?

Connecticut's 2026 income tax rates are: 3% on income up to $10,000 (single) or $20,000 (joint); 5% on $10,001–$50,000 (single) or $20,001–$100,000 (joint); 5.5% on $50,001–$100,000 (single) or $100,001–$200,000 (joint); 6% on $100,001–$200,000 (single); 6.5% on $200,001–$250,000 (single); 6.9% on $250,001–$500,000 (single); 6.99% on income over $500,000 (single). Most CT middle-income residents pay 5%–5.5%.

Are Treasury bills better than CDs for Connecticut residents?

Treasury bill interest is exempt from Connecticut state income tax. For a CT resident paying 5.5% state tax and 22% federal tax, the after-tax yield on a T-bill at 4.35% APY is approximately 3.41% — similar to a CD at 4.65% APY after tax (3.37%). The difference is small for most CT residents, but meaningful for those in the 6.99% top bracket.

What are notable Connecticut banks and credit unions for CDs?

Notable Connecticut options include Ion Bank (Naugatuck-based community bank), Salisbury Bank (northwestern CT), Sikorsky Financial Credit Union (Stratford-based; open to Sikorsky/United Technologies employees and Fairfield County residents), and CUES (Connecticut credit union umbrella serving various membership groups).

Connecticut CD Rates 2026 — Best CDs Available to CT Residents

Connecticut residents pay 3%–6.99% state income tax on CD interest in 2026. The best CD rates available to CT residents reach 4.75% APY through FDIC-insured online banks. Connecticut’s high cost of living and income tax environment make it worth comparing CDs to Treasury bills, which are exempt from CT state income tax.

Rates shown are as of May 2026 and change frequently. Verify current rates directly with the institution before opening.

Best CD Rates Available to Connecticut Residents (May 2026)

Institution	Type	12-Month APY	Min. Deposit
Online banks (Ally, Marcus, Discover, CIT)	Online	4.50–4.75%	$0–$2,500
Ion Bank	CT community bank	3.75–4.25%	$1,000
Sikorsky Financial CU	CT credit union	3.75–4.25%	$500
Salisbury Bank	CT/NY community bank	3.50–4.00%	$1,000
Traditional big banks	National bank	0.01–1.00%	$1,000+

Connecticut State Income Tax on CD Interest (2026, Single Filers)

CT Taxable Income	State Rate
$0–$10,000	3%
$10,001–$50,000	5%
$50,001–$100,000	5.5%
$100,001–$200,000	6%
$200,001–$250,000	6.5%
$250,001–$500,000	6.9%
Over $500,000	6.99%

After-tax yield on a 4.65% CD for a typical CT resident (22% fed + 5.5% CT):

Total marginal rate: ~27.5%
After-tax yield: ~3.37%

T-Bills vs. CDs for Connecticut Residents

	12-Month CD	12-Month T-Bill
Gross yield	4.65%	4.35%
Federal taxable	Yes	Yes
CT state taxable (5.5%)	Yes	No
After-tax yield (22% fed + 5.5% CT)	~3.37%	~3.41%

The after-tax advantage of T-bills is modest for most CT residents but grows for those in the 6.5%–6.99% brackets.

What $10,000 Earns at Top Available CT Rates

Term	APY	Gross Interest	After-Tax (22% fed + 5.5% CT)
6 months	4.40%	~$219	~$159
12 months	4.65%	~$465	~$337
2 years	4.10%	~$838	~$608

Notable Connecticut Institutions

Ion Bank — Naugatuck-based; community bank with competitive CD rates for CT residents
Sikorsky Financial Credit Union — Stratford-based; open to current/former United Technologies/Raytheon employees and family members; also open to Fairfield County residents through community membership
Salisbury Bank — Northwestern CT and Dutchess County, NY; strong community rates for relationship customers
People’s United (now M&T Bank) — Bridgeport-based, now merged into M&T Bank; largest CT-origin bank by assets

Written by WealthVieu

WealthVieu researches and writes data-driven personal finance guides using primary sources including the IRS, Bureau of Labor Statistics, Federal Reserve, and Census Bureau.

The content on Wealthvieu is for informational purposes only and should not be considered financial, tax, or investment advice. Consult a qualified professional before making financial decisions. Full disclaimer · Editorial policy