Chapter Two: Information ProcessingPrinciples of Accounting globe

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Information clip artThe previous chapter showed how transactions caused financial statement amounts to change. "Before" and "after" examples were used to develop the illustrations. Imagine if a real business tried to keep up with its affairs this way! Perhaps a giant marker board could be set up in the accounting department. As transactions occurred, they would be communicated to the department and the marker board would be updated. Chaos would quickly rule. Even if the business could manage to figure out what its financial statements were supposed to contain, it probably could not systematically describe the transactions that produced those results. Obviously, a system is needed.

It is imperative that a business develop a reliable accounting system to capture and summarize its voluminous transaction data. The system must be sufficient to fuel the preparation of the financial statements, and be capable of maintaining retrievable documentation for each and every transaction. In other words, some transaction logging process must be in place.

In general terms, an accounting system is a system where transactions and events are reliably processed and summarized into useful financial statements and reports. Whether this system is manual or automated, the heart of the system will contain the basic processing tools: accounts, debits and credits, journals, and the general ledger. This chapter will provide insight into these tools and the general structure of a typical accounting system.


The records that are kept for the individual asset, liability, equity, revenue, expense, and dividend components are known as accounts. In other words, a business would maintain an account for cash, another account for inventory, and so forth for every other financial statement element. All accounts, collectively, are said to comprise a firm's general ledger. In a manual processing system, imagine the general ledger as nothing more than a notebook, with a separate page for every account. Thus, one could thumb through the notebook to see the "ins" and "outs" of every account, as well as existing balances. The following example reveals that cash has a balance of $63,000 as of January 12. By examining the account, one can see the various transactions that caused increases and decreases to the $50,000 beginning- of-month cash balance.

Cash General Ledger example

In many respects, this Cash account resembles the "register" one might keep for a wallet-style checkbook. A balance sheet on January 12 would include cash for the indicated amount (and, so forth for each of the other accounts comprising the entire financial statements). Notice that column headings for this illustrative Cash account included "increase" and "decrease" labels. In actuality, these labels would instead be "debit" and "credit." The reason for this distinction will become apparent in the following discussion.

Debits and Credits

References to debits and credits are quite common. A business may indicate it is “crediting” an account. “Debit” cards may be used to buy goods. Debits and credits (abbreviated “dr” and “cr”) are unique accounting tools to describe the change in a particular account that is necessitated by a transaction. In other words, instead of saying that cash is "increased" or "decreased," it is said that cash is "debited" or "credited." This method is again traced to Pacioli, the Franciscan monk who is given credit for the development of our enduring accounting model. Why add this complexity -- why not just use plus and minus like in the previous chapter? There is an ingenious answer to this question that will soon be discovered!

Understanding the answer to this question begins by taking note of two very important observations:

(1) every transaction can be described in debit/credit form


(2) for every transaction, debits = credits

The Fallacy of a “+/-” system

The second observation above would not be true for an increase/decrease system. For example, if services are provided to customers for cash, both cash and revenues would increase (a “+/+” outcome). On the other hand, paying an account payable causes a decrease in cash and a decrease in accounts payable (a “-/-” outcome). Finally, some transactions are a mixture of increase/decrease effects; using cash to buy land causes cash to decrease and land to increase (a “-/+” outcome). In the previous chapter, the “+/-” nomenclature was used for the various illustrations. Take time to review the comprehensive illustration that was provided in Chapter 1, and notice that various combinations of pluses and minuses were needed.

As one can tell by reviewing the illustration, the "+/-" system lacks internal consistency. Therefore, it is easy to get something wrong and be completely unaware that something has gone amiss. On the other hand, the debit/credit system has internal consistency. If one attempts to describe the effects of a transaction in debit/credit form, it will be readily apparent that something is wrong when debits do not equal credits. Even modern computerized systems will challenge or preclude any attempt to enter an "unbalanced" transaction that does not satisfy the condition of debits = credits.

The debit/credit rules are built upon an inherently logical structure. Nevertheless, many students will initially find them confusing, and somewhat frustrating. This is a bit similar to learning a new language. As such, memorization usually precedes comprehension. Take time now to memorize the "debit/credit" rules that are reflected in the following diagrams. Going forward, one needs to have instant recall of these rules, and memorization will allow the study of accounting to continue on a much smoother pathway. Full comprehension will follow in short order.


Debit rules illustrationAs shown at left, asset, expense and dividend accounts each follow the same set of debit/credit rules. Debits increase these accounts and credits decrease these accounts. These accounts normally carry a debit balance. To aid recall, rely on this mnemonic: D-E-A-D = debits increase expenses, assets, and dividends.






Credit rules illustrationLiability, revenue, and equity accounts each follow rules that are the opposite of those just described. Credits increase liabilities, revenues, and equity, while debits result in decreases. These accounts normally carry a credit balance.





Transaction Analysis

Link to Excel ExerciseIt is now apparent that transactions and events can be expressed in "debit/credit" terminology. In essence, accountants have their own unique shorthand to portray the financial statement consequence for every recordable event. This means that as transactions occur, it is necessary to perform an analysis to determine (a) what accounts are impacted and (b) how they are impacted (increased or decreased). Then, debits and credits are applied to the accounts, utilizing the rules set forth in the preceding paragraphs.


Source documents

Binder clip artUsually, a recordable transaction will be evidenced by a source document. A disbursement will be supported by the issuance of a check. A sale might be supported by an invoice issued to a customer. A time report may support payroll costs. A tax statement may document the amount paid for taxes. A cash register tape may show cash sales. A bank deposit slip may show collections of customer receivables. Suffice it to say, there are many potential source documents, and this is just a small sample. Source documents usually serve as the trigger for initiating the recording of a transaction. The source documents are analyzed to determine the nature of a transaction and what accounts are impacted. Source documents should be retained (perhaps in electronic form) as an important part of the records supporting the various debits and credits that are entered into the accounting records. To illustrate, assume that Jill Aoki is an architect. Concurrent with delivering completed blueprints to one of her clients, she also prepared and presented an invoice for $2,500. The invoice is the source document evidencing the completed work for which payment is now due. Therefore, Accounts Receivable is to be increased (debited) and Revenues must be increased (credited). When her client pays, the resulting bank deposit receipt will provide evidence for an entry to debit Cash (increased) and credit Accounts Receivable (decreased).

A properly designed accounting system will have controls to make sure that all transactions are fully captured. It would not do for transactions to slip through the cracks and go unrecorded. There are many such safeguards that can be put in place, including use of prenumbered documents and regular reconciliations. For example, an individual might maintain a checkbook for recording cash disbursements. A monthly reconciliation should be performed to make sure that the checkbook accounting system has correctly reflected all disbursements. A business must engage in similar activities to make sure that all transactions and events are recorded correctly. Good controls are essential to business success. Much of the work performed by a professional accountant relates to the design, implementation, and evaluation of properly functioning control systems.

an Account's Balance

Link to Excel ExerciseThe balance of a specific account can be determined by considering its beginning (of period) balance, and then netting or offsetting all of the additional debits and credits to that account during the period. Earlier, an illustration for a Cash account was presented. That illustration was developed before the introduction of debits and credits. However, accounts are maintained by using the debit/ credit system. The Cash account is repeated below, except that the increase/decrease columns have been replaced with the more traditional debit/credit column headings. A typical Cash account would look similar to this illustration:

Cash General Ledger example

Bear in mind that each of the debits and credits to Cash shown in the preceding illustration will have some offsetting effect on another account. For instance, the $10,000 debit on January 2 would be offset by a $10,000 credit to Accounts Receivable. The process by which this occurs will become clear in the following sections of this chapter.

A Common Misunderstanding About Credits

Checkbook clip artMany people wrongly assume that credits always reduce an account balance. However, a quick review of the debit/credit rules reveals that this is not true. Where does this notion come from? Probably because of the common phrase "we will credit your account." This wording is often used when one returns goods purchased on credit. Carefully consider that the account (with the store) is on the store's books as an asset account (specifically, an account receivable). Thus, the store is reducing its accounts receivable asset account (with a credit) when it agrees to credit the account. On the customer's books one would debit (decrease) a payable account (liability).

On the other hand, some may assume that a credit always increases an account. This incorrect notion may originate with common banking terminology. Assume that Matthew made a deposit to his account at Monalo Bank. Monalo's balance sheet would include an obligation ("liability") to Matthew for the amount of money on deposit. This liability would be credited each time Matthew adds to his account. Thus, Matthew is told that his account is being "credited" when he makes a deposit.


The Journal

What is already known about a journal (not an accounting journal, just any journal)? It's just a log book, right? A place where one can record a history of transactions and events, usually in date (chronological) order. Likewise, an accounting journal is just a log book that contains a chronological listing of a company's transactions and events. The accounting journal serves to document business activity as it occurs. However, rather than including a detailed narrative description of a company's transactions and events, the journal lists the items by a form of shorthand notation. Specifically, the notation indicates the accounts involved, and whether each is debited or credited.

The general journal is sometimes called the book of original entry. This means that source documents are reviewed and interpreted as to the accounts involved. Then, they are documented in the journal via their debit/credit format. As such the general journal becomes a log book of the recordable transactions and events. The journal is not sufficient, by itself, to prepare financial statements. That objective is fulfilled by subsequent steps. But, maintaining the journal is the point of beginning toward that end objective.

Journal example

Link to Excel ExerciseThe following illustration draws upon the facts for the Xao Corporation. Specifically it shows the journalizing process for Xao’s transactions. Review it carefully, specifically noting that it is in chronological order with each transaction of the business being reduced to the short-hand description of its debit/credit effects. For instance, the first transaction increases both cash and equity. Cash, an asset account, is increased via a debit. Capital Stock, an equity account, is increased via a credit. The next transaction increases Advertising Expense "with a debit" and decreases Cash "with a credit."

Note that each transaction is followed by a brief narrative description; this is a good practice to provide further documentation. For each transaction, it is customary to list "debits" first (flush left), then the credits (indented right). Finally, notice that a transaction may involve more than two accounts (as in the January 28 transaction); the corresponding journal entry for these complex transactions is called a "compound" entry.

In reviewing the general journal for Xao, note that it is only two pages long. An actual journal for a business might consume hundreds or thousands of pages to document its many transactions. As a result, some businesses may maintain the journal in electronic form only.

General Journal Example

Second general journal example

Special Journals

The illustrated journal was referred to as a "general" journal. Most businesses will maintain a general journal. All transactions can be recorded in the general journal. However, a business may sometimes find it beneficial to employ optional "special journals." Special journals are deployed for highly redundant transactions.

For example, a business may have huge volumes of redundant transactions that involve cash receipts. Thus, the company might have a special cash receipts journal. Any transaction entailing a cash receipt would be recorded therein. Indeed, the summary total of all transactions in this journal could correspond to the debits to the Cash account, further simplifying the accounting process. Other special journals might be used for cash payments, sales, purchases, payroll, and so forth.

The special journals do not replace the general journal. Instead, they just strip out recurring type transactions and place them in their own separate journal. The transaction descriptions associated with each transaction found in the general journal are not normally needed in a special journal, given that each transaction is redundant in nature. Without special journals, a general journal can become quite voluminous.

Page Numbering

Second, notice that the illustrated journal consisted of two pages (labeled Page 1 and Page 2). Although the journal is chronological, it is helpful to have the page number indexing for transaction cross-referencing and working backward from financial statement amounts to individual transactions. The benefits of this type of indexing will become apparent in the general ledger exhibits within the following section of the chapter. As an alternative, some companies will assign a unique index number to each transaction, further facilitating the ability to trace transactions throughout the entire accounting system.


The general journal does nothing to tell a company about the balance in each specific account. For instance, how much cash does Xao Corporation have at the end of January? One could go through the journal and net the debits and credits to Cash ($25,000 - $2,000 + $4,000 - $500 + $4,800 - $5,000 = $26,300). But, this is tedious and highly susceptible to error. It would become virtually impossible if the journal were hundreds of pages long. A better way is needed. This is where the general ledger comes into play.


The General Ledger

As illustrated, the general journal is, in essence, a notebook that contains page after page of detailed accounting transactions. In contrast, the general ledger is, in essence, another notebook that contains a page for each and every account in use by a company. As examples, the ledger accounts for Xao would include the Cash and Accounts Receivable pages illustrated below:

Cash general ledger example

Account receivable general ledger example

Xao’s transactions utilized all of the following accounts:

  • Cash
  • Accounts Payable
  • Service Revenue
  • Accounts Receivable
  • Notes Payable
  • Advertising Expense
  • Land
  • Capital Stock
  • Utilities Expense

Therefore, Xao’s general ledger will include a separate page for each of these nine accounts.


Link to Excel ExerciseNext, consider how the details of each specific account can be determined through a process known as posting. To "post" means to copy the entries listed in the journal into their respective ledger accounts. In other words, the debits and credits in the journal will be accumulated ("transferred"/"sorted") into the appropriate debit and credit columns of each ledger page. The following illustration shows the posting process. Arrows are drawn for the first journal entry posting. A similar process would occur for each of the other transactions to produce the resulting ledger pages.

In reviewing the ledger accounts below, notice that the "description" column includes a cross-reference back to the journal page in which the transaction was initially recorded. This reduces the amount of detailed information that must be recorded in the ledger, and provides an audit trail back to the original transaction in the journal. The check marks in the journal indicate that a particular transaction has been posted to the ledger. Without these marks (in a manual system), it would be very easy to fail to post a transaction, or even post the same transaction twice.

Posting illustration

To Review

Thus far the following accounting “steps” should have been grasped:

  • STEP 1: Each transaction is analyzed to determine the accounts involved
  • STEP 2: A journal entry is entered into the general journal for each transaction
  • STEP 3: Periodically, the journal entries are posted to the appropriate general ledger pages

Invoice illustration


The Trial Balance

Video LectureAfter all transactions have been posted from the journal to the ledger, it is a good practice to prepare a trial balance. A trial balance is simply a listing of the ledger accounts along with their respective debit or credit balances. The trial balance is not a formal financial statement, but rather a self-check to determine that debits equal credits. Following is the trial balance prepared for Xao Corporation.

Xao trial balance example

Debits Equal Credits

Link to Excel ExerciseSince each transaction was journalized in a way that insured that debits equaled credits, one would expect that this equality would be maintained throughout the ledger and trial balance. If the trial balance fails to balance, an error has occurred and must be located. It is much better to be careful as one proceeds, rather than having to go back and locate an error after the fact. Be aware that a "balanced" trial balance is no guarantee of correctness. For example, failing to record a transaction, recording the same transaction twice, or posting an amount to the wrong account would produce a balanced (but incorrect) trial balance.

Financial Statements From The Trial Balance

The next chapter reveals additional adjustments that may be needed to prepare a truly correct and up-to-date set of financial statements. But, for now, a tentative set of financial statements could be prepared based on the trial balance. The basic process is to transfer amounts from the general ledger to the trial balance, then into the financial statements:

General ledger illustration

In reviewing the following financial statements for Xao, notice that italics are used to draw attention to the items taken directly from the previously shown trial balance. The other line items and amounts simply relate to totals and derived amounts within the statements.

Xao Corporation

Chart of Accounts

A listing of all accounts in use by a particular company is called the chart of accounts. Individual accounts are often given a specific reference number. The numbering scheme helps keep up with the accounts in use and the classification of accounts. For example, all assets may begin with "1" (e.g., 101 for Cash, 102 for Accounts Receivable, etc.), liabilities with "2," and so forth. The assignment of a numerical value to each account assists in data management, in much the same way as zip codes help move mail more efficiently. Many computerized systems allow rapid entry of accounts by reference number rather than by entering a full account description. A simple chart of accounts for Xao Corporation might appear as follows:

  • No. 101: Cash
  • No. 102: Accounts Receivable
  • No. 103: Land
  • No. 201: Accounts Payable
  • No. 202: Notes Payable
  • No. 301: Capital Stock
  • No. 401: Service Revenue
  • No. 501: Advertising Expense
  • No. 502: Utilities Expense

Another benefit is that each account can be further subdivided into subsets. For instance, if Accounts Receivable bears the account number 102, one would expect to find that individual customers might be numbered as 102.001, 102.002, 102.003, etc. This facilitates the maintenance of "subsidiary" account records which are the subject of the next section of this chapter.

Control and Subsidiary Accounts

Some general ledger accounts are made of many sub-components. For instance, a company may have total accounts receivable of $19,000, consisting of amounts due from Compton, Fisher, and Moore. The accounting system must be sufficient to reveal the total receivables, as well as amounts due from each customer. Therefore, sub-accounts are used. In addition to the regular general ledger account, separate auxiliary receivable accounts would be maintained for each customer, as shown in the following detailed illustration:

Accounts receivable illustration

The total receivables are the sum of all the individual receivable amounts. Thus, the Accounts Receivable general ledger account total is said to be the control account or control ledger, as it represents the total of all individual subsidiary account balances. It is simply imperative that a company be able to reconcile subsidiary accounts to the broader control account that is found in the general ledger. Here, computers can be particularly helpful in maintaining the detailed and aggregated data in perfect harmony.


Computerized Processing Systems

Video LectureNotice that much of the material in this chapter involves mundane processing. Once the initial journal entry is prepared, the data are merely being manipulated to produce the ledger, trial balance, and financial statements. It is no wonder that the first business applications that were computerized years ago related to transaction processing. In short, the only "analytics" relate to the initial transaction recordation. All of the subsequent steps are merely mechanical, and are aptly suited to computers.

Many companies produce accounting software. These packages range from the simple to the complex. Some basic software products for a small business may be purchased for under $100. In large organizations, millions may be spent hiring consultants to install large enterprise-wide packages. Some software companies offer cloud-based accounting systems, with the customers utilizing the internet to enter data and produce their reports.

How Do They Work?

Link to Excel ExerciseAs one might expect, the look, feel, and function of software-based packages varies significantly. Following is a very typical data entry screen. It should look quite familiar. After the data are input, the subsequent processing (posting, etc.) is totally automated.

Journal entry screen illustration

Each company's product must be studied to understand its unique attributes. Accounting software packages generally:

  • Attempt to simplify and automate data entry (e.g., a point-of-sale terminal may actually become a data entry device into the accounting system).
  • Divide the accounting process into modules related to functional areas such as sales/collection, purchasing/payment, and others.
  • Attempt to be "user-friendly" by providing data entry blanks that are easily understood in relation to the underlying transactions.
  • Attempt to minimize key-strokes by using "pick lists," automatic call-up functions, and auto-complete type technology.
  • Are built on database logic, allowing transaction data to be sorted and processed based on any query structure (e.g., produce an income statement for July).
  • Provide up-to-date data that may be accessed by key business decision makers.
  • Are capable of producing numerous specialized reports.


Despite each product's own look and feel, the persons primarily responsible for the maintenance and operation of the accounting function must still understand accounting basics such as those introduced in this chapter: accounts, debits and credits, journal entries, etc. Without that intrinsic knowledge, the data input decisions will quickly go astray, and the output of the computerized accounting system will become hopelessly trashed. Accounting knowledge is essential in the successful implementation and use of most any computerized system and the reports it produces.



Video LectureA useful tool for demonstrating certain transactions and events is the T-account. Importantly, one would not use T-accounts for actually maintaining the accounts of a business. Instead, they are just a quick and simple way to figure out how a small number of transactions and events will impact a company. T-accounts would quickly become unwieldy in an enlarged business setting. In essence, T-accounts are just a "scratch pad" for account analysis. They are useful communication devices to discuss, illustrate, and think about the impact of transactions. The physical shape of a T-account is a "T," and debits are on the left and credits on the right. The "balance" is the amount by which debits exceed credits (or vice versa).

Below is the T-account for Cash for the transactions and events of Xao Corporation. Carefully compare this T-account to the actual running balance ledger account which is also shown (notice that the debits in black total to $33,800, the credits in red total to $7,500, and the excess of debits over credits is $26,300 -- which is the resulting account balance shown in blue).

T account and general ledger example