Debits and Credits Demystified

If you've read single entry vs. double entry and still find yourself staring at a blank journal entry wondering "wait, which side gets the debit?" — you're not alone. Debits and credits are the single most confusing part of bookkeeping for beginners, and it's almost entirely because of one thing: the words don't mean what everyday English makes you think they mean.

This guide untangles that. By the end, you'll know exactly which side to put any account on, without guessing.

Forget what your bank taught you

Your bank statement shows a "credit" when money lands in your account and a "debit" when money leaves. That's the opposite of what those words mean in bookkeeping, and it trips up almost every beginner.

Here's why: your bank's statement is written from the bank's perspective, not yours. When you deposit $100, the bank now owes you $100 more — that's a credit to their liability to you. When you withdraw, their liability drops — a debit. The bank isn't lying; they're just keeping their books.

In your books, it works the other way around. Forget the bank-statement meaning entirely. In bookkeeping, debit and credit are just labels for two columns. Nothing more.

What debit and credit actually mean

A debit is an entry on the left. A credit is an entry on the right. That's it.

They are not "plus" or "minus." They don't mean "good" or "bad." They're just sides. What they do to an account balance depends on what kind of account it is.

The five account types, and how they react

Every account in your chart of accounts belongs to one of five types. Each type has a "natural side" — the side that makes the balance go up.

Three accounts go up on debit: Assets and Expenses. Three accounts go up on credit: Liabilities, Equity, and Revenue.

You do not need to memorize ten rules. You need to memorize one mnemonic.

The DEALER mnemonic

DEALER tells you which accounts go up on debit and which go up on credit.

• Dividends (owner draws for small businesses)
• Expenses
• Assets

These three go up on a debit.

• Liabilities
• Equity
• Revenue

These three go up on a credit.

Once DEALER clicks, you never have to look up a rule again. Any time you touch an account, ask two questions: which type is this, and is the balance going up or down? The side follows automatically.

Walking through a real entry

You pay $300 for mulch with your business debit card. Two accounts are affected:

1. Supplies Expense — an expense account. It's going up (you spent $300). Expenses go up on debit → debit $300.
2. Business Checking — an asset account. It's going down (cash left). Assets go up on debit, so going down means the opposite → credit $300.

Debits equal credits. Entry balances. Done.

Notice you never had to ask "is debit good or bad?" You only asked two things: what type of account, and is the balance going up or down.

The one that always confuses people: revenue

Revenue is the account type that feels most counterintuitive, because credits increase it.

You collect $2,000 from a client. Your instinct might be "revenue went up, so debit it" — but that's wrong. Revenue is an R in DEALER, so it goes up on a credit.

The asset (cash) increases with a debit. The revenue increases with a credit. Both sides balance.

If this feels backwards, remember: revenue isn't cash — it's a claim that the business earned something. The cash itself is an asset and sits on the debit side. The earning event gets recorded on the credit side. Two different things, two different sides.

The one sentence version

Debits go on the left. Credits go on the right. Assets and expenses go up on the left. Liabilities, equity, and revenue go up on the right.

If you remember that sentence — or just DEALER — every journal entry becomes mechanical. You're no longer guessing; you're looking up an account type and asking "up or down?"

Key takeaway

Debits and credits are not plus and minus. They are left and right. Which one increases a balance depends on the account type, and DEALER gives you the whole rule in six letters. Once you have that, you're ready to apply it to real entries — which is exactly what the five journal entry patterns covers next.

Frequently asked questions

Is a debit always an increase? No. A debit increases assets and expenses, and decreases liabilities, equity, and revenue. Whether a debit is an increase or a decrease depends entirely on what kind of account you're touching.

Why does my bank statement use "credit" for deposits? Because your bank is showing you their books, not yours. Your deposit increases their liability to you, which is a credit on their side. In your own books, that same deposit is a debit to your cash (asset) account.

Do I need to think about debits and credits every time I record a transaction? Only for manual journal entries. If you're categorizing transactions that came in through a bank feed or statement import, Twin Owls handles the mechanics — you just pick the category.

What happens if debits don't equal credits? Twin Owls won't let you post the entry. The save button stays disabled and the balance indicator shows how far off you are. That's the self-checking feature of double-entry bookkeeping in action.

Where does "DEALER" come from? It's a teaching mnemonic, not an official accounting term — just the first letters of the three debit-positive and three credit-positive account types. Plenty of variations exist (some use "DEA / LER"), but they all point at the same rule.

Related

• Single entry vs. double entry accounting — why two sides exist at all
• Journal entries explained — applying debits and credits to real transactions
• Setting up your chart of accounts — the accounts DEALER classifies