Connecticut LLC Tax Guide for Non-Resident Entrepreneurs

Why Choose Connecticut for Your LLC?

Strategic location between New York and Boston with access to financial services talent, top universities (Yale), and a wealthy consumer base.

Connecticut Tax Overview

Understanding Connecticut's tax structure is essential for non-resident LLC owners. Here's a comprehensive breakdown of all applicable taxes.

Personal Income Tax

Connecticut imposes a personal income tax at rates of 3% – 6.99%. If your LLC is taxed as a disregarded entity or partnership, your share of the LLC's Connecticut-sourced income may be subject to state income tax. Non-residents are generally only taxed on income sourced within Connecticut.

If your LLC has no physical presence, employees, or customers in Connecticut, you likely won't owe state income tax — but you should confirm this with a tax professional familiar with Connecticut nexus rules.

Corporate / Entity Tax

Connecticut imposes a corporate tax rate of 7.5%. This applies to LLCs that have elected to be taxed as C-corporations. Single-member LLCs treated as disregarded entities for federal tax purposes are generally not subject to the state corporate income tax.

Sales Tax

Connecticut has a state sales tax rate of 6.35%. Local jurisdictions may impose additional sales taxes. If your LLC sells taxable goods or services in Connecticut, you'll need to collect and remit sales tax. Remote sellers may be required to collect Connecticut sales tax if they exceed the state's economic nexus thresholds (typically $100,000 in sales or 200 transactions).

LLC Formation Requirements

Forming an LLC in Connecticut involves the following steps and costs:

• Formation fee: $120
• File with: Connecticut Secretary of the State
• Registered agent: Required (must have a physical address in Connecticut)
• Operating agreement: Recommended but not always required to be filed with the state
• EIN application: Required for tax filing (Form SS-4)

Annual Requirements & Fees

After forming your Connecticut LLC, you'll need to maintain compliance with these ongoing requirements:

Federal Tax Obligations

Regardless of which state your LLC is formed in, non-resident LLC owners must comply with these federal requirements:

• Form 5472: Required for all foreign-owned single-member LLCs to report transactions between the LLC and its foreign owner. Penalty for non-filing: $25,000.
• Pro Forma Form 1120: Filed together with Form 5472 as an information return for disregarded entities.
• ITIN (Form W-7): Non-residents need an Individual Taxpayer Identification Number to file US tax returns.
• EIN (Form SS-4): Required for all LLCs to open bank accounts and file taxes.
• FBAR (FinCEN 114): Required if your US financial accounts exceed $10,000 at any point during the year.

Pros and Cons of a Connecticut LLC

Advantages

• Strategic Northeast location
• Access to financial services talent
• Strong legal protections
• Proximity to NYC and Boston

Disadvantages

• High tax rates
• High cost of living
• $80 annual report fee
• Business Entities Tax may apply