How a business is taxed depends in part on the business’s legal form. The five most common types of Massachusetts businesses include corporations, S corporations, Limited Liability Companies (LLCs), partnerships, and sole proprietorships. Most states subject corporations to a corporate income tax. In contrast, pass-through entities such as S corporations, LLCs, partnerships, and sole proprietorships are subject to a state’s tax on personal income. Tax rates vary widely among states regarding both corporate and private income.