Connecticut State Business Income Tax

What kind of tax will you owe on Connecticut business income?

Most states tax at least some types of business income derived from the state. As a rule, the details of how income from a specific business is taxed depend in part on the business’s legal form. In most states corporations are subject to a corporate income tax, while income from pass-through entities such as S corporations, limited liability companies (LLCs), partnerships, and sole proprietorships is subject to a state’s tax on personal income. Tax rates for both corporate income and personal income vary widely among states. Corporate rates, which most often are flat regardless of the amount of income, generally range from roughly 4% to 10%. Personal rates, which generally vary depending on the amount of income, can range from 0% (for small amounts of taxable income) to around 9% or more in some states.

Currently, six states – Nevada, Ohio, South Dakota, Texas, Washington, and Wyoming – do not have a corporate income tax. However, four of those states – Nevada, Ohio, Texas, and Washington – do have some form of gross receipts tax on corporations. Moreover, five of those states – Nevada, South Dakota, Texas, Washington, and Wyoming – as well as Alaska and Florida currently have no personal income tax. Individuals in New Hampshire and Tennessee are only taxed on interest and dividend income.

Apart from taxing business income through a corporate income tax or a personal income tax, many states impose a separate tax on at least some businesses, sometimes called a franchise tax or privilege tax. This is frequently justified as a tax simply for the privilege of doing business in the state. As with state taxes on business income, the specifics of a state’s franchise tax often depend in part on the legal form of the business. Franchise taxes are generally either a flat fee or an amount based on a business’s net worth.

Connecticut has both a corporate income tax (which Connecticut calls its corporation business tax) and a business entity tax (BET). Your business may be subject to one, both, or neither of these taxes. Additionally, if income from your business passes through to you personally, that income will be subject to taxation on your personal state tax return.

Connecticut’s corporation business tax annually taxes corporations at the greatest of the following three amounts:

  • 7.5% of net income
  • 3.1 mills per dollar of capital holdings (multiply capital holdings amount by .0031); or
  • $250 minimum tax.

Corporation business tax returns are due on the fifteenth day of the first month after a corporation’s federal tax return is due. For corporations whose tax year corresponds with the calendar year, this means returns are due on May 15th.

The business entity tax applies to all common limited liability entities other than C corporations: S corporations, LLCs, limited liability partnerships, and limited partnerships. The BET is assessed every two years. Due dates vary depending on your business’s tax year. The amount due is a flat $250.

Here’s a brief look at additional details for five of the most common forms of Connecticut business: corporations (C corporations), S corporations, LLCs, partnerships, and sole proprietorships.

Corporations

Connecticut corporations are subject to Connecticut’s corporation business tax.

Example: For the latest tax year, your Connecticut corporation had net income of $100,000 and capital holdings of $100,000. The greater tax will result from the 7.5% flat rate on net income. Other things being equal, the corporation will owe Connecticut corporate income tax in the amount of $7,500 (7.5% of $100,000).

S Corporations

An S corporation is created by first forming a traditional corporation, and then filing a special form with the IRS to elect S status. Unlike a traditional corporation, an S corporation generally is not subject to separate federal income tax. Rather, each individual shareholder is subject to federal tax on his or her share of the corporation’s income. In other words, S corporations are pass-through entities. (Note that a shareholder’s share of the S corporation’s income need not actually be distributed to the shareholder in order for the shareholder to owe tax on that amount.) Connecticut recognizes the federal S election, and Connecticut S corporations are not required to pay corporation business tax to the state. However, individual S corporation shareholders will owe tax on their share of the corporation’s income. In addition, every two years an S corporation is required to pay the BET.

Example: For the latest tax year, your S corporation had net income of $100,000. The $100,000 in net income will be allocated to you and your fellow shareholders, and you will each pay tax on your own portions on your respective state tax returns. Your tax rate will vary depending on your overall taxable income and any required minimum tax. In addition, if your S corporation was not liable for the biennial BET last year then it will be this year. The due date will depend on your S corporation’s tax year.

Limited Liability Companies (LLCs)

Like S corporations, standard LLCs are pass-through entities and are not required to pay income tax to either the federal government. LLCs also are not required to pay corporation business tax to the state. Instead, income from the business is distributed to individual LLC members, who then pay federal and state taxes on the amount distributed to them. In addition, every two years an LLC is required to pay the BET.

By default, LLCs are classified for tax purposes as partnerships (or, for single-member LLCs, disregarded entities), although it is possible to elect to have your LLC classified as a corporation. In that case, the LLC would also be subject to Connecticut’s corporate income tax.

Example: For the latest tax year, your multi-member LLC, which has the default tax classification of partnership, had net income of $100,000. The $100,000 in net income will be divvied up between you and your fellow LLC members, and you will each pay tax on your own portions on your respective state tax returns. Your tax rate will vary depending on your overall taxable income and any required minimum tax. In addition, if your LLC was not liable for the biennial BET last year then it will be this year. The due date will depend on your LLC’s tax year.

Partnerships

Income from partnerships is distributed to the individual partners, who then pay tax on the amount distributed to them on both their federal and state tax returns. Apart from limited liability partnerships (LLPs) and limited partnerships (LPs), not covered here, there is no BET due to the state.

Example: For the latest tax year, your partnership had net income of $100,000. The $100,000 in net income will be divvied up between you and your fellow partners, and you will each pay tax on your respective portions on your respective state tax returns. Your tax rate will vary depending on your overall taxable income and any required minimum tax.

Sole Proprietorships

Income from your business will be distributed to you as the sole proprietor, and you will pay tax to the state on that income.

Example: For the latest tax year, your sole proprietorship had net income of $100,000. The $100,000 in net income is distributed to you personally, and you pay tax on that income on your individual state tax return; your tax rate will vary depending on your overall taxable income and any required minimum tax.

Note on Multistate Businesses and Nexus

Our primary focus here is on businesses operating solely in Connecticut. However, if you’re doing business in several states, you should be aware that your business may be considered to have nexus with those states, and therefore may be obligated to pay taxes in those states. Also, if your business was formed or is located in another state, but generates income in Connecticut, it may be subject to Connecticut taxes. The rules for taxation of multistate businesses, including what constitutes nexus with a state for the purpose of various taxes, are complicated. If you run such a business, you should consult with a tax professional.

Additional Information

For further guidance on Connecticut’s corporation income tax, check the Department of Revenue Services website. For information on business-related taxes in other states, check Nolo’s 50-State Guide to Business Income Tax. And, if you’re looking for detailed guidance on federal income tax issues, check Tax Savvy for Small Business, by Frederick Daily (Nolo).

Updated: June 7, 2018

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