Debits and credits

The first known recorded use of the terms is Venetian Luca Pacioli's 1494 work, Summa de Arithmetica, Geometria, Proportioni et Proportionalita (All about Arithmetic, Geometry, Proportions and Proportionality). Pacioli devoted one section of his book to documenting and describing the double-entry bookkeeping system in use during the Renaissance by Venetian merchants, traders and bankers. This system is still the fundamental system in use by modern bookkeepers.[4] Indian merchants had developed a double-entry bookkeeping system, called bahi-khata, predating Pacioli's work by at least many centuries,[5] and which was likely a direct precursor of the European adaptation.[6]

It is sometimes said that, in its original Latin, Pacioli's Summa used the Latin words debere (to owe) and credere (to entrust) to describe the two sides of a closed accounting transaction. Assets were owed to the owner and the owners' equity was entrusted to the company. At the time negative numbers were not in use. When his work was translated, the Latin words debere and credere became the English debit and credit. Under this theory, the abbreviations Dr (for debit) and Cr (for credit) derive directly from the original Latin.[7] However, Sherman[8] casts doubt on this idea because Pacioli uses Per (Italian for "by") for the debtor and A (Italian for "to") for the creditor in the Journal entries. Sherman goes on to say that the earliest text he found that actually uses "Dr." as an abbreviation in this context was an English text, the third edition (1633) of Ralph Handson's book Analysis or Resolution of Merchant Accompts[9] and that Handson uses Dr. as an abbreviation for the English word "debtor." (Sherman could not locate a first edition, but speculates that it too used Dr. for debtor.) The words actually used by Pacioli for the left and right sides of the Ledger are "in dare" and "in havere" (give and receive).[10] Geijsbeek the translator suggests in the preface:

'if we today would abolish the use of the words debit and credit in the ledger and substitute the ancient terms of "shall give" and "shall have" or "shall receive", the personification of accounts in the proper way would not be difficult and, with it, bookkeeping would become more intelligent to the proprietor, the layman and the student.'[11]

As Jackson has noted, "debtor" need not be a person, but can be an abstract party:

"...it became the practice to extend the meanings of the terms ... beyond their original personal connotation and apply them to inanimate objects and abstract conceptions..."[12]

This sort of abstraction is already apparent in Richard Dafforne's 17th-century text The Merchant's Mirror, where he states "Cash representeth (to me) a man to whom I … have put my money into his keeping; the which by reason is obliged to render it back."

There are three kinds of accounts:

• Real accounts relate to the assets of a company, which may be tangible (machinery, buildings etc.) or intangible (goodwill, patents etc.)
• Personal accounts relate to individuals, companies, creditors, banks etc.
• Nominal accounts relate to expenses, losses, incomes or gains.

To determine whether to debit or credit a specific account, we use either the accounting equation approach (based on five accounting rules),[13] or the classical approach (based on three rules).[14] Whether a debit increases or decreases an account's net balance depends on what kind of account it is. The basic principle is that the account receiving benefit is debited, while the account giving benefit is credited. For instance, an increase in an asset account is a debit. An increase in a liability or an equity account is a credit.

The classical approach has three golden rules, one for each type of account:[15]

• Real accounts: Debit whatever comes in and credit whatever goes out.
• Personal accounts: Receiver's account is debited and giver's account is credited.
• Nominal accounts: Expenses and losses are debited and incomes and gains are credited.

The complete accounting equation based on the modern approach is very easy to remember if you focus on Assets, Expenses, Costs, Dividends (highlighted in chart). All those account types increase with debits or left side entries. Conversely, a decrease to any of those accounts is a credit or right side entry. On the other hand, increases in revenue, liability or equity accounts are credits or right side entries, and decreases are left side entries or debits.

Debits and credits occur simultaneously in every financial transaction in double-entry bookkeeping. In the accounting equation, Assets = Liabilities + Equity, so, if an asset account increases (a debit (left)), then either another asset account must decrease (a credit (right)), or a liability or equity account must increase (a credit (right)). In the extended equation, revenues increase equity and expenses, costs & dividends decrease equity, so their difference is the impact on the equation.

For example, if a company provides a service to a customer who does not pay immediately, the company records an increase in assets, Accounts Receivable with a debit entry, and an increase in Revenue, with a credit entry. When the company receives the cash from the customer, two accounts again change on the company side, the cash account is debited (increased) and the Accounts Receivable account is now decreased (credited). When the cash is deposited to the bank account, two things also change, on the bank side: the bank records an increase in its cash account (debit) and records an increase in its liability to the customer by recording a credit in the customer's account (which is not cash). Note that, technically, the deposit is not a decrease in the cash (asset) of the company and should not be recorded as such. It is just a transfer to a proper bank account of record in the company's books, not affecting the ledger.

To make it more clear, the bank views the transaction from a different perspective but follows the same rules: the bank's vault cash (asset) increases, which is a debit; the increase in the customer's account balance (liability from the bank's perspective) is a credit. A customer's periodic bank statement generally shows transactions from the bank's perspective, with cash deposits characterized as credits (liabilities) and withdrawals as debits (reductions in liabilities) in depositor's accounts. In the company's books the exact opposite entries should be recorded to account for the same cash. This concept is important since this is why so many people misunderstand what debit/credit really means.

When setting up the accounting for a new business, a number of accounts are established to record all business transactions that are expected to occur. Typical accounts that relate to almost every business are: Cash, Accounts Receivable, Inventory, Accounts Payable and Retained Earnings. Each account can be broken down further, to provide additional detail as necessary. For example: Accounts Receivable can be broken down to show each customer that owes the company money. In simplistic terms, if Bob, Dave, and Roger owe the company money, the Accounts Receivable account will contain a separate account for Bob, and Dave and Roger. All 3 of these accounts would be added together and shown as a single number (i.e. total 'Accounts Receivable' – balance owed) on the balance sheet. All accounts for a company are grouped together and summarized on the balance sheet in 3 sections which are: Assets, Liabilities and Equity.

All accounts must first be classified as one of the five types of accounts (accounting elements) ( asset, liability, equity, income and expense). To determine how to classify an account into one of the five elements, the definitions of the five account types must be fully understood. The definition of an asset according to IFRS is as follows, "An asset is a resource controlled by the entity as a result of past events from which future economic benefits are expected to flow to the entity".[16] In simplistic terms, this means that Assets are accounts viewed as having a future value to the company (i.e. cash, accounts receivable, equipment, computers). Liabilities, conversely, would include items that are obligations of the company (i.e. loans, accounts payable, mortgages, debts).

The Equity section of the balance sheet typically shows the value of any outstanding shares that have been issued by the company as well as its earnings. All Income and expense accounts are summarized in the Equity Section in one line on the balance sheet called Retained Earnings. This account, in general, reflects the cumulative profit (retained earnings) or loss (retained deficit) of the company.

The Profit and Loss Statement is an expansion of the Retained Earnings Account. It breaks-out all the Income and expense accounts that were summarized in Retained Earnings. The Profit and Loss report is important in that it shows the detail of sales, cost of sales, expenses and ultimately the profit of the company. Most companies rely heavily on the profit and loss report and review it regularly to enable strategic decision making.

The words debit and credit can sometimes be confusing because they depend on the point of view from which a transaction is observed. In accounting terms, assets are recorded on the left side (debit) of asset accounts, because they are typically shown on the left side of the accounting equation (A=L+SE). Likewise, an increase in liabilities and shareholder's equity are recorded on the right side (credit) of those accounts, thus they also maintain the balance of the accounting equation. In other words, if "assets are increased with left side entries, the accounting equation is balanced only if increases in liabilities and shareholder’s equity are recorded on the opposite or right side. Conversely, decreases in assets are recorded on the right side of asset accounts, and decreases in liabilities and equities are recorded on the left side". Similar is the case with revenues and expenses, what increases shareholder's equity is recorded as credit because they are in the right side of equation and vice versa.[17] Typically, when reviewing the financial statements of a business, Assets are Debits and Liabilities and Equity are Credits. For example, when two companies transact with one another say Company A buys something from Company B then Company A will record a decrease in cash (a Credit), and Company B will record an increase in cash (a Debit). The same transaction is recorded from two different perspectives.

This use of the terms can be counter-intuitive to people unfamiliar with bookkeeping concepts, who may always think of a credit as an increase and a debit as a decrease. This is because most people typically only see their personal bank accounts and billing statements (e.g., from a utility). A depositor's bank account is actually a Liability to the bank, because the bank legally owes the money to the depositor. Thus, when the customer makes a deposit, the bank credits the account (increases the bank's liability). At the same time, the bank adds the money to its own cash holdings account. Since this account is an Asset, the increase is a debit. But the customer typically does not see this side of the transaction.[18]

On the other hand, when a utility customer pays a bill or the utility corrects an overcharge, the customer's account is credited. This is because the customer's account is one of the utility's accounts receivable, which are Assets to the utility because they represent money the utility can expect to receive from the customer in the future. Credits actually decrease Assets (the utility is now owed less money). If the credit is due to a bill payment, then the utility will add the money to its own cash account, which is a debit because the account is another Asset. Again, the customer views the credit as an increase in the customer's own money and does not see the other side of the transaction.

There are five fundamental elements[13] within accounting. These elements are as follows: Assets, Liabilities, Equity (or Capital), Income (or Revenue) and Expenses. The five accounting elements are all affected in either a positive or negative way. A credit transaction does not always dictate a positive value or increase in a transaction and similarly, a debit does not always indicate a negative value or decrease in a transaction. An asset account is often referred to as a "debit account" due to the account's standard increasing attribute on the debit side. When an asset (e.g. an espresso machine) has been acquired in a business, the transaction will affect the debit side of that asset account illustrated below:

The "X" in the debit column denotes the increasing effect of a transaction on the asset account balance (total debits less total credits), because a debit to an asset account is an increase. The asset account above has been added to by a debit value X, i.e. the balance has increased by £X or $X. Likewise, in the liability account below, the X in the credit column denotes the increasing effect on the liability account balance (total credits less total debits), because a credit to a liability account is an increase.

All "mini-ledgers" in this section show standard increasing attributes for the five elements of accounting.

Summary table of standard increasing and decreasing attributes for the accounting elements:

Each transaction that takes place within the business will consist of at least one debit to a specific account and at least one credit to another specific account. A debit to one account can be balanced by more than one credit to other accounts, and vice versa. For all transactions, the total debits must be equal to the total credits and therefore balance.

The general accounting equation is as follows:

Assets = Equity + Liabilities,[22]

A = E + L.

The equation thus becomes A – L – E = 0 (zero). When the total debits equals the total credits for each account, then the equation balances.

The extended accounting equation is as follows:

Assets + Expenses = Equity/Capital + Liabilities + Income,

A + Ex = E + L + I.

In this form, increases to the amount of accounts on the left-hand side of the equation are recorded as debits, and decreases as credits. Conversely for accounts on the right-hand side, increases to the amount of accounts are recorded as credits to the account, and decreases as debits.

This can also be rewritten in the equivalent form:

Assets = Liabilities + Equity/Capital + (Income − Expenses),

A = L + E + (I − Ex),

where the relationship of the Income and Expenses accounts to Equity and profit is a bit clearer.[23] Here Income and Expenses are regarded as temporary or nominal accounts which pertain only to the current accounting period whereas Asset, Liability, and Equity accounts are permanent or real accounts pertaining to the lifetime of the business.[24] The temporary accounts are closed to the Equity account at the end of the accounting period to record profit/loss for the period. Both sides of these equations must be equal (balance).

Each transaction is recorded in a ledger or "T" account, e.g. a ledger account named "Bank" that can be changed with either a debit or credit transaction.

In accounting it is acceptable to draw-up a ledger account in the following manner for representation purposes:

The process of using debits and credits creates a ledger format that resembles the letter "T".[31] The term "T-account" is accounting jargon for a "ledger account" and is often used when discussing bookkeeping.[32] The reason that a ledger account is often referred to as a T-account is due to the way the account is physically drawn on paper (representing a "T"). The left column is for debit (Dr) entries, while the right column is for credit (Cr) entries.

All accounts also can be debited or credited depending on what transaction has taken place. For example, when a vehicle is purchased using cash, the asset account "Vehicles" is debited and simultaneously the asset account "Bank or Cash" is credited due to the payment for the vehicle using cash. Some balance sheet items have corresponding "contra" accounts, with negative balances, that offset them. Examples are accumulated depreciation against equipment, and allowance for bad debts (also known as allowance for doubtful accounts) against accounts receivable.[33] United States GAAP utilizes the term contra for specific accounts only and does not recognize the second half of a transaction as a contra, thus the term is restricted to accounts that are related. For example, sales returns and allowance and sales discounts are contra revenues with respect to sales, as the balance of each contra (a debit) is the opposite of sales (a credit). To understand the actual value of sales, one must net the contras against sales, which gives rise to the term net sales (meaning net of the contras).[34]

A more specific definition in common use is an account with a balance that is the opposite of the normal balance (Dr/Cr) for that section of the general ledger.[34] An example is an office coffee fund: Expense "Coffee" (Dr) may be immediately followed by "Coffee – employee contributions" (Cr).[35] Such an account is used for clarity rather than being a necessary part of GAAP (generally accepted accounting principles).[34]

Each of the following accounts is either an Asset (A), Contra Account (CA), Liability (L), Shareholders' Equity (SE), Revenue (Rev), Expense (Exp) or Dividend (Div) account.

Account transactions can be recorded as a debit to one account and a credit to another account using the modern or traditional approaches in accounting and following are their normal balances: