Connecticut sales tax return

File the Connecticut sales tax return and remit the tax collected, on the monthly, quarterly or annual schedule the state assigned.

When: By the last day of the 1st month after each quarter.
Agency: Connecticut Department of Revenue Services
Applies to: Every company collecting sales tax in Connecticut.
If missed: Late filing and payment penalties plus interest; personal liability for the owners for tax collected and not remitted
Source: portal.ct.gov, read October 22, 2026

Jay explains

A business that collects Connecticut sales tax files returns on a schedule the Connecticut Department of Revenue Services assigns from its volume: monthly for larger sellers, quarterly for most small ones, annually for the smallest. Dates here assume quarterly, due the last day of the month after the quarter. Sales tax collected belongs to the state, and owners can be held personally liable for it.

Next dates

For a calendar year company. Shown as the agency states them; if a date falls on a weekend, file before it.

October 31, 2026
January 31, 2027
April 30, 2027
July 31, 2027
October 31, 2027
January 31, 2028
April 30, 2028
July 31, 2028

Also in Connecticut

Connecticut annual report Connecticut annual report Connecticut annual report Connecticut nonprofit annual report Connecticut charitable organization registration renewal Connecticut corporate income tax return Connecticut corporate estimated tax payment Connecticut pass through entity return Connecticut personal income tax return with business income Connecticut unemployment insurance wage report Connecticut annual withholding reconciliation Connecticut Paid Leave contributions

See it on your company's calendar

Your company's compliance calendar

Three answers to start. Refine it after.

What kind of organization is it?

An LLC's tax treatment decides which federal return it files. Choose the line that matches yours. Nonprofits are covered too.

State of formation

Employees

Count everyone on payroll. An S corporation's working owners are employees: they are paid a salary.

Where is it based? The state of the office, or of most of the people

A company based outside its state of formation is registered in both and files in both.

More about the company: other states, payroll, dates, abroad

Company name

Date registered in each other state

Optional. Some states key their report to the day you registered there rather than your date of formation; without it, the formation date stands in and the calendar says so.

Who runs payroll?

Fiscal year ends in

Date of formation

Connecticut keys its report to this date. Add it and the calendar places it.

Annual revenue

Some taxes start at a revenue threshold.

We pay independent contractors We offer a retirement plan (401(k), SIMPLE, SEP)

Outside the United States We hold a bank or financial account outside the US A person or company outside the US owns 25% or more of it We own 10% or more of a company outside the US We pay people or companies outside the US

Each adds the FinCEN or IRS form that comes with it: the FBAR, Form 5472, Form 5471, Forms 1042 and 1042-S.

No account needed. Nothing is stored until you save it.

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