As you launch or expand a business, keeping track of the money, preparing tax returns and performing other financial tasks can quickly become a burden. If you need to devote more time to other things, it might make sense to turn over tax, accounting and other financial chores to outside specialists. Choosing the right type of tax, accounting, bookkeeping or other financial help is an important decision. An outside accountant can be one of your most trusted business advisers and a key to your success. Although many business owners work with big national firms, most prefer to work with small independent firms or solo accounting professionals. Accounting services differ from bookkeeping services, however. An accounting firm prepares financial statements and tax returns based on the numbers that you give them via your own in-house books.