sole proprietorship

The simplest way to be 'in business' is to just start doing it: a freelance designer takes a client, a gardener mows lawns for pay, a baker sells at the market. There are no partners and no shareholders — just one person who owns everything and answers for everything. That arrangement is a sole proprietorship, by far the most common form of business in the world precisely because it takes almost nothing to set up.

A sole proprietorship is a business owned and run by a single individual, where the owner and the business are legally the same person. The owner keeps all the profits and, crucially, is personally responsible for all the debts — this is called unlimited liability. If the business owes 10,000 dollars it cannot pay, creditors can pursue the owner's personal car, savings, or home. For accounting, though, the business is still treated as a separate entity with its own books, so the owner can tell whether it is actually profitable.

The form's strengths are simplicity, low cost, and full control; its great weakness is that unlimited liability puts personal assets at risk, and the business cannot easily raise large sums or survive the owner's departure. It also typically does not pay tax itself — the profit flows onto the owner's personal tax return. A common confusion is mixing the legal picture with the accounting picture: legally the owner and business are one, yet good accounting still demands their money be kept strictly apart.