Chapter 3 — Debits and Credits, Demystified

Chapter 3 — Debits and Credits, Demystified

“Debit” and “credit” scare more small business owners than anything else in accounting. They are simpler than they sound — much of the confusion comes from the words meaning something different at the bank than in your books.

Forget what your bank taught you

On your bank statement, a “credit” is money added and a “debit” is money taken out — but that is the bank’s bookkeeping, not yours: to the bank, your deposit is their liability (they owe you the money).

In your books, debits and credits are just the two sides of an entry. Debit means left. Credit means right. That is the whole secret. Every transaction is recorded as one or more debits and one or more credits, and the total debits must always equal the total credits. When they do not, the entry is wrong — the same principle as the accounting equation, because debits and credits are the mechanism that keeps the equation balanced.

The real question is: which accounts get debited and which get credited? That depends on the account type.

DEAD CLIC: the rule you will never forget

Accounting students have used a mnemonic for generations. It is a little silly, and it works:

• DEAD: Debits increase Expenses, Assets, and Dividends (owner withdrawals).
• CLIC: Credits increase Liabilities, Income, and Capital (equity).

In plain words: debits increase assets, expenses, and owner draws; credits increase liabilities, income, and equity. The opposite action decreases them. Why? Assets are on the left of the equation, and debits are the left of an entry — left increases left; credits increase the right-side accounts. Expenses and draws reduce equity, so they are debits. You do not need the theory memorized. Just remember: DEAD CLIC.

Putting it to work: real examples

Take Sam’s plumbing business through a week of transactions — understanding these entries lets him spot when something is recorded wrong.

• Sam deposits $10,000 of his own savings. Debit Cash $10,000; Credit Owner’s Equity $10,000.
• He buys $2,500 of tools with the business debit card. Debit Tools $2,500; Credit Cash $2,500 — one asset swapped for another.
• He completes a repair and invoices the customer $1,800. Debit Accounts Receivable $1,800; Credit Service Income $1,800.
• He pays $400 for liability insurance. Debit Insurance Expense $400; Credit Cash $400.
• He takes $600 out for his personal rent. Debit Owner’s Draw $600; Credit Cash $600. Not an expense — his rent is not a business cost, and recording it as one would overstate deductions.
• He receives $3,000 — payment on last month’s invoice. Debit Cash $3,000; Credit Accounts Receivable $3,000. No income is recorded here — the income was recorded when earned; recording it again counts the same dollar twice.

Every entry balances: total debits = total credits — which is why software refuses to save an “out of balance” entry.

What if I use accounting software?

Then you will rarely type the words “debit” and “credit” at all. When you enter a bill, the software debits the expense and credits accounts payable behind the scenes. When you receive a payment, it debits cash and credits the receivable. So why learn this at all? Because when something looks wrong — an expense showing as a negative, a liability with a strange balance — DEAD CLIC tells you which direction things should move, so you can find the error. And because it is the language your bookkeeper and accountant speak.

Practice round: six transactions

Time to test DEAD CLIC. For each transaction, name the debit and the credit before reading the answer.

• You pay $1,200 for a year of business insurance, in cash. → Debit Prepaid Insurance $1,200; Credit Cash $1,200. Twelve months of coverage is an asset.
• You buy $600 of supplies on credit. → Debit Supplies $600; Credit Accounts Payable $600.
• You pay the vendor $600. → Debit Accounts Payable $600; Credit Cash $600.
• You complete a $2,000 project; the client pays immediately. → Debit Cash $2,000; Credit Service Income $2,000. No receivable — nothing left to collect.
• You record this month’s $800 loan interest. → Debit Interest Expense $800; Credit Cash $800. Only the interest is the expense.
• A customer pays $1,500 toward last month’s invoice. → Debit Cash $1,500; Credit Accounts Receivable $1,500. No new income — it was recorded when the invoice went out.

If you got four or more, the logic is landing. If DEAD CLIC still feels shaky, redo these tomorrow — spaced repetition beats cramming.

The three mistakes everyone makes

Even people who understand the rules keep tripping on the same three errors:

1. Thinking from the bank’s perspective. Your bank statement says a deposit is a “credit.” In your books, that same deposit is a debit to Cash (your asset went up — debits increase assets). The bank’s books are a mirror image of yours. When in doubt, ask: “Did my asset go up or down?”

2. Recording only half the entry. Beginners sometimes record “paid $400 for insurance” as just a decrease in cash, forgetting the other side (the expense, or the prepaid asset). Every transaction needs both halves — that is what “double-entry” means.

3. Letting similar transactions drift into different accounts. One month the internet bill goes to “Utilities,” next month to “Office Expenses,” the month after to “Miscellaneous.” Each entry balances perfectly — and your expense reports become useless, because the same cost is scattered across three accounts. Pick the account once and stay consistent.

Reading a journal entry

As you work with accountants — or peek under the hood of your software — you will encounter journal entries written in the classic format: debits listed first, credits indented below, with a brief explanation:

Dr Office Supplies Expense — 350
Cr Cash — 350
(Purchase of printer paper and ink)

“Dr” is debit, “Cr” is credit — abbreviations from centuries of accounting tradition. Check it with DEAD CLIC: the debit increases the expense, the credit decreases the asset. Balanced: $350 = $350.

Once you can read this format, you can read any accountant’s work papers and any year-end adjustment your CPA proposes.

Key takeaways

• Debit means left, credit means right. Total debits must always equal total credits.
• DEAD CLIC: debits increase Expenses, Assets, and Draws; credits increase Liabilities, Income, and Capital.
• “Debit” does not mean “decrease” — whether it increases or decreases an account depends on the account type.
• Receiving payment on an invoice records no new income — the income was recorded when earned.
• Owner withdrawals are draws, not expenses.
• Software hides debits and credits, but knowing them lets you find errors and talk to your accountant.