Filing your Connecticut sales tax return is simple with the state’s online system. You can file and pay directly through Connecticut’s myconneCT, as long as your business is registered to collect and remit sales tax.
This guide walks you through the step-by-step process of filing online so you can submit returns on time, avoid penalties, and stay compliant with Pennsylvania’s sales tax rules.
What You Need Before Filing
Before filing your sales tax return, you must prepare specific records to ensure your report is accurate. Here are the standard documents and information required to file a sales tax return in Connecticut.
- Connecticut Sales and Use Tax Permit – You’re required to provide your Connecticut Business Registration Number to file your sales tax return. This number is available immediately online after you complete your business registration, and a temporary permit can be printed for your records. The permanent permit is then mailed to you. This number can be found on your Connecticut Sales Tax Permit document.
- myconneCT Account Log-in Details – The primary way to file your Connecticut sales tax return online is by logging into your myconneCT account. To access the site, ensure you have your log-in credentials ready (e.g., your username and password).
- Total Sales – Gather your total revenue during the filing period. This includes all sales, whether they’re taxable or not. Even if you currently have no sales records, you’re still required to file a return.
- Taxable Sales – Compile the total taxable sales your business made within the filing period.
- Taxable Purchases – Verify the total amount of taxable purchases your business spent within the filing period. This applies to both in-state and out-of-state transactions.
- Local Sales Tax Report – Connecticut requires businesses to file a local sales tax report. This means you must list all your sales in each city, county, or other local jurisdiction in Connecticut.
- Mode of Payment – You can pay Connecticut sales tax on myconneCT by direct bank account debit (ACH), credit/debit card, or scheduled payment, with confirmation provided. Please note that the credit card service provider charges a convenience fee for payments made with a credit or debit card.
Step-by-Step: How to File Connecticut Sales Tax Online
Step 1. Go to the Connecticut Department of Revenue Services – myconneCT website. Step 2. Enter your Account Credentials: Log in using your username and password. Check your shared email/phone number and enter the OTP when applicable.
Step 3. Prepare your Ecommerce Sales Tax Data (e.g., Taxes Report from Shopify).
Step 4. Under Sales & Use, click File Now to begin the filing process.
Step 5. Select General Sales by ticking the checkbox, then click Next to proceed.
Step 6. Enter the correct sales amounts for each county or city as shown in your tax report, then click Next.
Step 7. Enter the client’s name in the designated field, then click Submit.
Step 8. Provide the client’s bank details as required, then click Next to continue.
Step 9. Save the confirmation in your preferred location for recordkeeping purposes. Keeping online records using Google Drive is a common option.
Helpful tip: If the filing process is interrupted by internet issues, website downtime, or other disruptions. You can always click on “Save and Submit Later” to avoid losing your progress.
Due Dates
Connecticut assigns a filing frequency (monthly, quarterly, or annually) based on your business’s sales tax liability.
The returns and payments are due on the last day of the month following the reporting period. If the due date falls on a weekend or legal holiday, the due date is the next business day.| FREQUENCY | REQUIREMENT | REPORTING PERIOD | DUE DATE |
| Monthly | More than $4,000 in sales tax liability for the previous 12-month period. | Monthly | Last day of the month following the reporting period |
| Quarterly | $1,000 to $4,000 in sales tax liability for the previous 12-month period. |
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| Annually | Less than $1,000 in sales tax liability for the previous 12-month period. | January 1 to December 31 | January 31 |
Timely Filing Discount
Some states offer businesses a discount for timely sales tax collection, filing, and remittance. Currently, Connecticut does not provide any timely filing discount.Filing Amended Returns
If you make an error on your return, you must file an amended return. The process for amending a sales tax return differs from that of a regular return. You can do this through the myconneCT website or by completing a new Connecticut Sales and Use Tax Return (Form OS-114). Be sure to check the amended return box and enter the correct figures for that reporting period. When filing electronically, the system will recognize that a return has already been filed for the period and will prompt you to amend it. You can then edit the original return’s figures to reflect the correct information.Refunds
The Sales and Use Tax Refund Policy outlines the Department’s procedures for handling refunds for taxes that were overpaid or collected in error. Refunds or credits must be requested in writing within three years of the original due date, unless the request is connected to an assessment, which must be filed within six months after finalization. Retailers or purchasers can submit refund claims under certain conditions. Retailers may file on behalf of purchasers if they prove the tax was collected, remitted, and refunded to the purchaser.Filing Zero Returns in Connecticut
Another important requirement in Connecticut is the mandatory filing of returns for every reporting period, even if a business has made no taxable sales and has no tax liability. Businesses must complete and file Form OS-114 to report all sales activity in Connecticut, even if no sales were made or no tax is due. Both taxable and nontaxable sales must be reported in accordance with your monthly, quarterly, or annual filing frequency assigned by DRS.Other Filing Methods in Connecticut
The Connecticut Sales and Use Tax Return (Form OS‑114) must be filed and paid electronically through myconneCT. It allows taxpayers to file, pay, and manage state tax responsibilities electronically. There are no official exceptions to the electronic filing mandate. If you’re having difficulties filing your Connecticut sales tax return online, you can try other options:- File with TaxHero – Let expert accountants in TaxHero prepare your sales tax returns for you. We’ll take everything off your hands so that you can spend your time more efficiently managing your business.
- File using a Third-Party Tax Software – If you need assistance with the filing process, you can hire a professional tax preparer or use a third-party tax software service. These services prepare your return and file it through the myconneCT system on your behalf, ensuring compliance with the electronic filing requirement.