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The Accounting Equation

The Accounting Equation

The resources controlled by a business are referred to as its assets. For a new business, those assets originate from two possible sources:
  • Investors who buy ownership in the business
  • Creditors who extend loans to the business
Those who contribute assets to a business have legal claims on those assets. Since the total assets of the business are equal to the sum of the assets contributed by investors and the assets contributed by creditors, the following relationship holds and is referred to as the accounting equation :

Assets
   =     
Liabilities   +   Owners' Equity
Resources

Claims on the Resources

Initially, owner equity is affected by capital contributions such as the issuance of stock. Once business operations commence, there will be income (revenues minus expenses, and gains minus losses) and perhaps additional capital contributions and withdrawals such as dividends. At the end of a reporting period, these items will impact the owners' equity as follows:

Assets
   =     
Liabilities
  +  
Owners' Equity



  +  
Revenues



  -  
Expenses



  +  
Gains



  -  
Losses



  +  
Contributions



  -  
Withdrawals

These additional items under owners' equity are tracked in temporary accounts until the end of the accounting period, at which time they are closed to owners' equity.
The accounting equation holds at all times over the life of the business. When a transaction occurs, the total assets of the business may change, but the equation will remain in balance. The accounting equation serves as the basis for the balance sheet, as illustrated in the following example.

The Accounting Equation  -  A Practical Example

To better understand the accounting equation, consider the following example. Mike Peddler decides to open a bicycle repair shop. To get started he rents some shop space, purchases an initial inventory of bike parts, and opens the shop for business. Here is a listing of the transactions that occurred during the first month:

Date      
Transaction
Sep 1
Owner contributes $7500 in cash to capitalize the business.
Sep 8
Purchased $2500 in bike parts on account, payable in 30 days.
Sep 15
Paid first month's shop rent of $1000.
Sep 17
Repaired bikes for $1100; collected $400 cash; billed customers for the $700 balance.
Sep 18
$275 in bike parts were used.
Sep 25
Collected $425 from customer accounts.
Sep 28
Paid $500 to suppliers for parts purchased earlier in the month.
These transactions affect the accounting equation as shown below.

Assets
=
Liabilities  +  Owner's Equity

Cash
+
Bike
Parts
+
Accounts
Receivable
=
Accounts
Payable
+
Peddler,
Capital
+
Revenue
(Expenses)
Sep 1
7500




=


7500


Sep 8


2500


=
2500




Sep 15
(1000)




=




(1000)
Sep 17
400



700
=




1100
Sep 18


(275)


=




(275)
Sep 25
425



(425)
=





Sep 28
(500)




=
(500)




Totals:
6825
+
2225
+
275
=
2000
+
7500
+
(175)

$9325
=
$9325


Note that for each date in the above example, the sum of entries under the "Assets" heading is equal to the sum of entries under the "Liabilities + Owner's Equity" heading. In most of these cases, the transaction affected both sides of the accounting equation. However, note that the Sep 25 transaction affected only the asset side with an increase in cash and an equal but opposite decrease in accounts receivable.
At the end of the month of September, the net income (revenues minus expenses) is closed to capital and the balance sheet for the business would appear as follows:
Peddler's Bikes
Balance Sheet
September 30, 20xx
Assets
     
Liabilities  & 
Owner's Equity
Cash
6825

Accounts Payable
2000
Accounts Receivable
275

Peddler, Capital
7325
Bike Parts
2225



Total Assets
$9325

Total Liabilities
$9325

The bike parts are considered to be inventory, which appears as an asset on the balance sheet. The owner's equity is modified according to the difference between revenues and expenses. In this case, the difference is a loss of $175, so the owner's equity has decreased from $7500 at the beginning of the month to $7325 at the end of the month.

Debits and Credits

The above example illustrates how the accounting equation remains in balance for each transaction. Note that negative amounts were portrayed as negative numbers. In practice, negative numbers are not used; in a double-entry bookkeeping system the recording of each transaction is made via debits and credits in the appropriate accounts.

Recommended Reading
Schaum's Outline of Bookkeeping and Accounting

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