Cost Accounting For Dummies
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When cost accounting, you increase and decrease account balances using debits and credits. Business owners need to know these terms because they can’t understand your accounting process without them. Here are rules that never change:

  • Debits: Always posted on the left side of an account

  • Credits: Always posted on the right side of an account

So all accounts are formatted like this:

Material Control
Debit Credit
In accounting, debit and credit don’t mean the same things they do in common talk. Debit can refer to an increase or a decrease. It depends on what type of account you’re working with. The same is true of a credit. Here are the rules:

Asset accounts:

  • Debits: Always increase the account balance. A big debit in the Cash account (an asset) is a good thing

  • Credits: Always decrease the account balance

Control accounts, work-in-process, and finished goods are all inventory accounts, making them asset accounts. Cost of goods sold is an expense account. Debiting increases all of these accounts. The balance for any of these accounts is equal to debit balance less credit balance.

Liability accounts:

  • Debits: Always decrease the account balance

  • Credits: Always increase the account balance

Income accounts:

  • Debits: Always decrease the account balance

  • Credits: Always increase the account balance

Expense accounts:

  • Debits: Always increase the account balance.

  • Credits: Always decrease the account balance

There’s an accounting mantra: “What’s the impact of this transaction on the general ledger?” Always ask. There are several answers, depending on what you’re doing, but in time you will know them all. And it’s not as though if something goes up something else goes down. For example, when you sell something, cash (an asset) gets a debit and goes up. On the other side of the transaction, income gets a credit and goes up.

About This Article

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About the book author:

Kenneth W. Boyd has 30 years of experience in accounting and financial services. He is a four-time Dummies book author, a blogger, and a video host on accounting and finance topics.

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