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1.2: An Introduction to Double-Entry Bookkeeping

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    Learning Objectives

    At the end of this section, students should be able to meet the following objectives:

    1. Explain the history of double-entry bookkeeping.
    2. List the four steps followed in the accounting process.
    3. Indicate the purpose of a T-account.
    4. List the rules for using debits and credits.
    5. Understand the reason that debits and credits are always equal.

    Question: Transaction analysis determines the changes in account balances as the events of each day take place. Financial statements provide a formal structure to communicate the resulting balances periodically to an array of interested parties. Revenues, expenses, gains, and losses are presented on an income statement where they are combined to arrive at reported net income for the period. Total income earned and dividends paid by the company over its entire life are netted to compute the current retained earnings balance. Assets, liabilities, capital stock, and retained earnings are all displayed on a balance sheet. Changes in cash are separated into operating activities, investing activities, and financing activities and disclosed on a statement of cash flows. Notes offer pages of additional explanatory information. The amount of financial data that is readily available is impressive.

    The accountant for a business of any significant size faces a daunting challenge in creating financial statements: gathering, measuring, and reporting the impact of the many varied events that occur virtually every day. As an example, for 2022, Xerox Corporation disclosed revenues of over $7.1 billion and operating expenses and other costs of $7.4 billion. At the end of 2022, the Kellogg Company reported holding $1.8 billion in inventory—which is a lot of cereal—and indicated that its operating activities that year generated a net cash inflow of nearly $1.7 billion. How can any organization possibly amass and maintain such an enormous volume of data so that financial statements can be produced with no material misstatements?

    Answer: Over five hundred years ago, Venetian merchants in Italy developed a system that continues to serve in the twenty-first century as the basis for accumulating financial data throughout much of the world. Today, when every aspect of modern society seems to be in a constant state of flux, a process that has remained in use for over five centuries is almost impossible to comprehend. However, the double-entry bookkeeping procedures that were first documented in 1494 by Fra Luca Bartolomeo de Pacioli (a friend of Leonardo da Vinci) remain virtually unchanged by time. Organizations, both small and large, use the fundamentals of double-entry bookkeeping to collect the information needed to produce financial statements that are fairly presented according to the rules of U.S. GAAP.

    Question: This assertion sounds like science fiction. It hardly seems believable that Xerox keeps up with over $7.1 billion in revenue (approximately $19.5 million per day) using the same methods that Venetian merchants applied to their transactions during the Renaissance. How can a five-hundred-yearold bookkeeping system possibly be usable by today’s modern businesses?

    Answer: State-of-the-art computers and other electronic devices are designed to refine and accelerate the financial accounting process but the same basic organizing procedures have been utilized now for hundreds of years. In simplest terms, accounting systems are all created to follow four sequential steps:

    • Analyze
    • Record
    • Adjust
    • Report

    As explained previously, financial accounting starts by analyzing each transaction—every event that has a monetary impact on the organization—to ascertain the changes created in accounts such as rent expense, cash, inventory, and dividends paid. Fortunately, a vast majority of any company’s transactions are repetitive so that many of the effects can be easily anticipated. A sale on credit always increases both accounts receivable and revenues. Regardless of the time or place, a cash purchase of equipment increases the balance reported for equipment while decreasing cash. Computer systems can be programmed to record the impact of these events automatically allowing the accountant to focus on analyzing more complex transactions.

    Question: The second step in the accounting system is listed above as “record.” At the beginning of this chapter, a number of transactions were presented and their impact on individual accounts determined. Following this analysis, some method has to be devised to capture the information in an orderly fashion. Officials could just list the effect of each transaction on a sheet of paper: increase inventory $2,000 and increase accounts payable $2,000; increase salary expense $300 and decrease cash $300. However, this process is slow and poorly organized. A more efficient process is required. What is the key to recording transactions after all account changes are identified?

    Answer: An essential step in understanding the accounting process is to realize that financial information is accumulated by accounts. Every balance to be reported in a company’s financial statements is maintained in a separate account. Thus, for assets, an individual account is established to monitor cash, accounts receivable, inventory, and so on. To keep track of expenses, a number of additional accounts are needed, such as cost of goods sold, rent expense, salary expense, and repair expense. The same is true for revenues, liabilities, and other categories. A small organization might utilize only a few dozen accounts for its entire recordkeeping system. A large company could have thousands.

    Based on the original Venetian model, the balance for each account is monitored in a form known as a T-account as displayed below. This structure provides room for recording on both the left side (known as the debit side) and the right side (the credit side).



    One side of each T-account records increases; the other side indicates decreases. For over five hundred years, the following rules have applied.

    The following are accounts where debits reflect an increase and credits a decrease:

    • Expenses and losses
    • Assets
    • Dividends paid1

    The following are accounts where credits reflect an increase and debits a decrease:

    • Liabilities
    • Capital stock
    • Revenues and gains
    • Retained earnings2

    The debit and credit rules for these seven general types of accounts provide a short-hand method for recording the financial impact that a transaction has on any account. They were constructed in this manner so that the following would be true:

    Debits must always equal credits for every transaction.

    At first, the debit and credit rules might seem completely arbitrary. However, they are structured to mirror the cause and effect relationship found in every transaction. This is the basis of what the Venetian merchants came to understand so long ago: every effect must have a cause.

    To illustrate:

    • Assume an asset (such as cash) increases. As shown above, that is recorded on the debit side of the specific asset’s T-account. What could cause an asset to become larger? A reason must exist. A liability—possibly a bank loan—could have been incurred (recorded as a credit); capital stock could have been issued to an owner (a credit); revenue could have been earned from a sale (a credit); another asset could have been sold (a credit). The list of possible reasons is relatively short. All of the possibilities that can change an asset were reviewed in Principles of Financial Accounting 1. In each case, the debit (increase) to the asset is caused by an equal and offsetting credit.
    • Assume an asset (such as cash) decreases. This change is recorded on the credit side of the asset’s T-account. What might cause this reduction? An expense could have been paid (recorded as a debit); a dividend could have been distributed to shareholders (a debit); a liability could have been paid (a debit); another asset could have been acquired (a debit). Once again, the cause and effect relationship is reflected; the debits equal the credits. Each effect is set equal and opposite to every potential cause.

    Think of debits and credits in terms of the Accounting Equation reviewed in Principles of Financial Accounting 1.  Note the journal entries recorded below for the receipt of 10,000 in cash in exchange for capital stock in the business.  The debit to cash increases the assets and the credit to capital stock increases the stockholders equity and keeps the equation in balance.  The second journal entry shows the company getting a bill from the utilities company saying that the company owes 500 for utilities that have been used in past (expense).  The credit to Accounts Payable increases the liabilities while the debit to Utilities Expense increases the expenses and decreases retained earnings/equity.  The accounting equation is set up so that if you make the dollar amount of the debits equal the dollar amount of the credits in your entry – the accounting equation has to stay in balance.

    Asset T accounts =               Liability T accounts +                                                    Equity T Accounts
    Cash Accounts Payable Capital Stock +                           Retained Earnings
    Debit Credit Debit Credit Debit Credit   –                  Utilities Expense
    10,000         10,000   Debit        Credit
          500       500  

    There are only seven types of accounts. Therefore, a mastery of debit and credit rules can be achieved with a moderate amount of practice. Because of the fundamental position of debits and credits within every accounting system, this knowledge is well worth the effort required.

    Check Yourself

    A company borrows $5,000 from the bank and deposits that money in their checking account.  What T accounts would be affected and how?

    Cash increases by $5,000 and the liability note or loan payable increases by $5,000.  Cash is an asset account and thus is increased by a debit.  Notes or loan payable is a liability and thus an increase is a credit.  So the amount of the debit to cash is $5,000 and the credit to notes or loan payable is for $5,000.  Thus the amounts of the debits and credits are equal.  If you keep them equal then your accounting equation will also remain in balance.

    Key Takeaway

    Most companies participate in numerous transactions each day that must be examined and organized so that financial statements can be prepared. This process requires four steps: analyze, record, adjust, and report. Over five hundred years ago, double-entry bookkeeping was created as a mechanical process to facilitate this gathering and reporting of financial information. A T-account is maintained for each of the accounts (such as cash, accounts payable, and rent expense) to be reported by a company. The left side of the T-account is the debit side, and the right side is the credit. Expenses and losses, assets, and dividends paid increase with debits. Liabilities, revenues and gains, capital stock, and retained earnings increase with credits. Debits always equal credits because every transaction must have both an effect and a cause for that effect.

    To visualize the effect of debits and credits using the accounting equation that was important in our earlier text:

                     ASSETS                    = LIABILITIES +                                               STOCKHOLDERS EQUITY
    Debits Increase Credits decrease Debits decrease Credits increase CAPITAL STOCK +                                RETAINED EARNINGS
            Debits decrease Credits increase REVENUES – EXPENSES –  DIVIDENDS
                Debits decrease Credits increase Debits increase Credits decrease Debits increase Credits decrease

    Note that on the left side of the equal sign the increases are also on the left (debit) and on the right side of the equal sign the increases are also on the right except for expenses and dividends.  The are just the opposite because they are subtracted from retained earnings rather than added.  Gains and losses would work like revenues and expenses respectively.


    1One method to keep track of these accounts initially is to remember them as the “DEAD” accounts: debits increase, expenses and losses, assets, and dividends paid. Quickly, though, through practice, such mnemonic devices will not be needed.

    2Changes in the balance reported for retained earnings normally do not come as a direct result of a transaction. As discussed previously, this account reflects all the net income earned to date reduced by all dividend payments. Income is made up of revenues, expenses, gains, and losses. Accounting recognition of revenues and gains (which increase with credits) lead to a larger retained earnings balance. Expenses, losses, and dividends paid (which all increase with debits) reduce retained earnings. Consequently, credits cause an increase in retained earnings whereas debits produce a decrease.


    1.2: An Introduction to Double-Entry Bookkeeping is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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