Form OP?424 2026

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Send op 424 business entity tax return via email, link, or fax. You can also download it, export it or print it out.

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  1. Click ‘Get Form’ to open Form OP?424 in the editor.
  2. At the top of the form, enter your entity’s taxable period, Connecticut Tax Registration Number, Federal Employer Identification Number (FEIN), and Connecticut Secretary of the State Business Identification Number.
  3. In the 'Business Entity Tax' section, indicate if this is a final return and provide your street address, city/town, state, and zip code.
  4. Fill in the amounts for lines 1 (Business entity tax), 2 (Penalty if late), and 3 (Interest). Calculate the total amount due by adding these amounts together.
  5. Sign the declaration at the bottom of the form. Ensure that it is signed by an authorized individual based on your entity type.

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When it comes to federal income tax, an LLC is a pass-through entity. This means that the LLC itself does not pay taxes on business income and does not have to file a return with the IRS.
For Distributive Share Percentage, see the instructions for Part 4 - Member Information, in the Form CT-PET instructions. Legislation makes the pass-through entity tax optional.
By default, a Connecticut LLC is taxed by the Internal Revenue Service (IRS) based on the number of Members the LLC has. Then the Connecticut Department of Revenue Services honors this and taxes your LLC the same way at the state level. An LLC with 1 owner (Single-Member LLC) is taxed like a Sole Proprietorship.
Connecticut ended the Business Entity Tax (BET) Youre still required to file any outstanding tax from prior years, so Form OP-424 is available in UltraTax CS 2019 and prior. Refer to the Connecticuit DOR website for more information.
Every corporation (or association taxable as a corporation) that carries on business or has the right to carry on business in Connecticut must complete a registration application and file Form CT‑1120, Corporation Business Tax Return.

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The CT business entity tax is a tax required of all limited liability companies that operate in the state of Connecticut. The business entity tax costs $250 and is due every two years.

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