What is the sales tax rate in Cos Cob, Connecticut?

The combined sales tax rate in Cos Cob, Connecticut is 6.400% as of 2026. This includes the Connecticut state rate of 6.400% plus local jurisdiction taxes.

How is the Cos Cob sales tax calculated?

Multiply your purchase amount by 6.400% (or 0.00640) to get the tax owed. For example, a $100 purchase incurs $6.40 in sales tax.

What is the Connecticut state sales tax rate?

The base Connecticut state sales tax rate is 6.400%. Local jurisdictions may add additional taxes on top of this rate.

Does Cos Cob have a county sales tax?

Cos Cob does not levy an additional county-level sales tax beyond the state base rate.

When was the Cos Cob sales tax rate last updated?

The Cos Cob sales tax rate was last verified on March 27, 2026. We cross-reference all rates against the official State Department of Revenue data.

Live Data: April 2026

Cos Cob, CT Sales Tax Rate 2026

The combined sales tax rate in Cos Cob, Connecticut is 6.400%.

Combined Rate 6.400%

State6.400%

Cos Cob Sales Tax Breakdown

Jurisdiction	Rate
Connecticut State Sales Tax	6.400%
Total Combined Rate	6.400%

Which County Is Cos Cob In?

Cos Cob falls within Western Connecticut, Connecticut. Western Connecticut imposes a 0.000% county-level sales tax in addition to the Connecticut state base rate.

Cos Cob ZIP Codes

The following ZIP codes are mapped to Cos Cob for sales tax purposes. All listed codes apply the 6.400% combined rate.

06807

Nearby Tax Rates

Combined Rate

Combined Rate

Business Nexus in Connecticut

Economic Nexus Threshold

Selling into Connecticut from out of state? Once you exceed $100,000 in annual sales or 200 transactions, you must register and collect Connecticut sales tax.

FAQ: Cos Cob Sales Tax

The combined sales tax rate in Cos Cob, Connecticut is 6.400% as of 2026.

Multiply your purchase price by 6.400% to find the tax owed. A $500 purchase would include $32.00 in sales tax.

Groceries are generally taxable in Connecticut. Check the official Department of Revenue for specific exemptions.

Vehicle purchases in Cos Cob are subject to the 6.400% combined rate, though some states apply different rules for vehicle sales. Verify with the Connecticut Department of Revenue or DMV.

Register for a sales tax permit through the official Connecticut Department of Revenue website. Registration is typically free and required before collecting any sales tax.

Sales Tax Calculator

Using 6.400% rate for Cos Cob, CT

Purchase Amount ($)

Tax Amount $0.00

Total with Tax $100.00

Rate applied: 6.400% combined

Official Tax Authority

Connecticut Department of Revenue Services

Filing Deadline: Monthly returns due the last day of the following month. File via myconneCT portal.

Visit Official Portal (860) 297-5962