​Every business needs bookkeeping.

​It’s one of the few services that no company can go without. Bookkeepers issue bills to customers, record receipts from clients, verify invoices from suppliers, monitor accounts, process employee pay, create financial reports, rectify accounting errors, and complete many other important tasks that keep a business running smoothly.

​There are two basic types of bookkeeping: single-entry and double-entry.

​There is a basic division within the field between single-entry and double-entry bookkeeping systems. In single-entry systems, each transaction is recorded with one entry in a journal or log. Single-entry systems are sometimes adequate for small, simple businesses, but they have a number of limitations and disadvantages.

​In double-entry systems, each financial event is recorded using two corresponding entries called a debit and a credit. For each transaction (or other financial event), you debit one account and credit another account. Each debit always equals the corresponding credit. You choose which accounts to credit/debit according to the accounting equation, which states that Equity = Assets – Liabilities, but don’t worry about the details of how this works for now. If you follow this rule and enter your debits/credits properly, the sum of debits for all accounts will always equal the corresponding sum of credits for all accounts. If not, then you know something has gone wrong. This allows for easy error-checking, and that’s the main reason double-entry systems are far more popular.