Corporations are taxed differently than other business structures: A corporation is the only type of business that must pay its own income taxes on profits. In contrast, partnerships, sole proprietorships, S corporations, and limited liability companies (LLCs) are not taxed on business profits; instead, the profits "pass through" the businesses to their owners, who report business income or losses on their personal tax returns.
Because a corporation is a separate legal entity from its owners, the company itself is taxed on all profits that it cannot deduct as business expenses. Generally, taxable profits consist of money kept in the company to cover expenses or expansion (called "retained earnings") and profits that are distributed to the owners (shareholders) as dividends.
To reduce taxable profits, a corporation can deduct many of its business expenses -- money the corporation spends in the legitimate pursuit of profit. In addition to start-up costs, operating expenses, and product and advertising outlays, a corporation can deduct the salaries and bonuses it pays and all of the costs associated with medical and retirement plans for employees. To be sure you don't miss out on important tax deductions, see the Business Tax & Deductions area of Nolo's website.
The corporation must file a corporate tax return, IRS Form 1120, and pay taxes at a corporate income tax rate on any profits. If a corporation will owe taxes, it must estimate the amount of tax due for the year and make quarterly payments to the IRS by the 15th day of the 4th, 6th, 9th, and 12th months of the tax year. If a corporation uses the calendar year as its tax year, the payments are due April 15, June 15, September 15, and December 15.
If the corporation's owners work for the corporation, they pay individual income taxes on their salaries and bonuses like regular employees of any company. Salaries and bonuses are deductible business expenses, so the corporation does not pay taxes on them.
If a corporation distributes dividends to the owners, they must report and pay personal income tax on these amounts. And because dividends, unlike salaries and bonuses, are not tax-deductible, the corporation must also pay taxes on them. This means that dividends are taxed twice -- once to the corporation and again to the shareholders. Smaller corporations rarely face this problem: Because their owners typically work for the corporation as employees, the corporation can pay them in the form of tax-deductible salaries and bonuses, rather than taxable dividends.
The scheme of taxation described in this article applies only to regular corporations, called C corporations. By contrast, a corporation that has elected S corporation status pays taxes like a partnership or limited liability company (LLC): All corporate profits or losses "pass through" the business and are reported on the owners' personal income tax returns. To learn more about S corporations, see S Corporations.
The Tax Cuts and Jobs Act established a new income tax deduction for pass-through entities. During 2018 through 2025, owners of sole proprietorships, partnerships, limited liability companies, and S corporations may deduct for income tax purposes up to 20% of the net income from the entity. Regular C corporations are not pass-through entities; thus, their shareholders do not qualify for this deduction.
Benefits of the Separate Corporate Income Tax
Although reporting and paying taxes on a separate corporate tax return can be time consuming, there are some benefits to having a separate level of taxation. Here we explain a few of them, but you should see a tax expert for a complete explanation of the pros and cons of corporate taxation as it applies to your situation. This is a very complicated area, and for some companies -- especially those that may experience losses, are involved in investing, or may soon be sold -- corporate taxation can be a real disadvantage.
Starting in 2018, corporations pay a flat tax of 21% on all their profits. The 21% rate is lower than the top five individual income tax rates, which range from 22% to 37%. The benefit of the lower rates is largely lost due to double taxation if corporate profits are distributed to the shareholders, who must pay individual income tax on such dividends. However, many corporations want or need to retain some profits in the business at the end of the year -- for instance, to fund expansion and future growth. If it does, that money will be taxed only once, at the 21% corporate income tax rate. Thus, a corporation's owners can save money by keeping some profits in the company.
In contrast, owners of sole proprietorships, partnerships, and LLCs must pay taxes on all business profits at their individual income tax rates, whether they take the profits out of the business or not.
The IRS will allow you to leave profits in your corporation, up to a limit: Most corporations can safely keep a total of $250,000 (at any one time) in the corporation without facing tax penalties (some professional corporations may not retain more than $150,000).
Another tax benefit of forming a corporation is that the company can deduct the full cost of fringe benefits provided to employees -- almost always including the business's owners -- and the owner-employees are not taxed on these benefits. Other types of business entities can also deduct the cost of many fringe benefits as a business expense, but owners who receive these benefits will ordinarily be taxed on their value.
To learn more about business taxes, read Tax Savvy for Small Business, by Frederick W. Daily (Nolo).