The right structure corporation, LLC, partnership, or sole proprietorship depends on who will own your business and what its activities will be.

When you start a business, you must decide whether it will be a sole proprietorship, partnership, corporation, or limited liability company (LLC).

Which of these forms is right for your business depends on the type of business you run, how many owners it has, and its financial situation. No one choice suits every business: Business owners have to pick the structure that best meets their needs. This article introduces several of the most important factors to consider, including:

The potential risks and liabilities of your business

The formalities and expenses involved in establishing and maintaining the various business structures

Your income tax situation, and

Your investment needs.

Risks and Liabilities

In large part, the best ownership structure for your business depends on the type of services or products it will provide. If your business will engage in risky activities -- for example, trading stocks or repairing roofs -- you'll almost surely want to form a business entity that provides personal liability protection ("limited liability"), which shields your personal assets from business debts and claims. A corporation or a limited liability company (LLC) is probably the best choice for you.

Formalities and Expenses

Sole proprietorships and partnerships are easy to set up -- you don't have to file any special forms or pay any fees to start your business. Plus, you don't have to follow any special operating rules.

LLCs and corporations, on the other hand, are almost always more expensive to create and more difficult to maintain. To form an LLC or corporation, you must file a document with the state and pay a fee. In addition, owners of corporations and LLCs must elect officers (usually, a president, vice president, and secretary) to run the company. They also have to keep records of important business decisions and follow other formalities.

If you're starting your business on a shoestring, it might make the sense to form the simplest type of business -- a sole proprietorship (for one-owner businesses) or a partnership (for businesses with more than one owner). Unless yours will be a particularly risky business, the limited personal liability provided by an LLC or a corporation may not be worth the cost and paperwork required to create and run one.

Income Taxes

Owners of sole proprietorships, partnerships, and LLCs all pay taxes on business profits in the same way. These three business types are "pass-through" tax entities, which means that all of the profits and losses pass through the business to the owners, who report their share of the profits (or deduct their share of the losses) on their personal income tax returns. Therefore, sole proprietors, partners, and LLC owners can count on about the same amount of tax complexity, paperwork, and costs.

Owners of these unincorporated businesses must pay income taxes on all net profits of the business, regardless of how much they actually take out of the business each year. Even if all of the profits are kept in the business checking account to meet upcoming business expenses, the owners must report their share of these profits as income on their tax returns.

In contrast, the owners of a corporation do not report their shares of corporate profits on their personal tax returns. The owners pay taxes only on profits they actually receive in the form of salaries, bonuses, and dividends.

The corporation itself pays taxes, at special corporate tax rates, on any profits that are left in the company from year to year (called "retained earnings"). Corporations also have to pay taxes on dividends paid out to shareholders, but this rarely affects small corporations, which seldom pay dividends.

This separate level of taxation adds a layer of complexity to filing and paying taxes, but it can be a benefit to some businesses. Owners of a corporation don't have to pay personal income taxes on profits they don't receive. And, because corporations enjoy a lower tax rate than most individuals.

Investment Needs

Unlike other business forms, the corporate structure allows a business to sell ownership shares in the company through its stock offerings. This makes it easier to attract investment capital and to hire and retain key employees by issuing employee stock options.

But for businesses that don't need to issue stock options and will never "go public," forming a corporation probably isn't worth the added expense. If it's limited liability that you want, an LLC provides the same protection as a corporation, but the simplicity and flexibility of LLCs offer a clear advantage over corporations.

Changing Your Mind

Your initial choice of a business structure isn't set in stone. You can start out as sole proprietorship or partnership and later, if your business grows or the risk of personal liability increases, you can convert your business to an LLC or a corporation.