Debits and Credits in Plain English
Debits and credits confuse almost every beginner because the words don't mean what they mean in everyday banking language. Your bank statement calls a deposit a "credit" to your account, which trains your brain backwards for bookkeeping. This lesson rebuilds the concept from scratch using the accounting equation, so you stop memorizing rules and start seeing why each account moves the way it does. By the end, you'll be able to look at any transaction and know instantly which side gets the debit and which gets the credit.
Why this skill matters professionally
Every bookkeeper, staff accountant, and small-business owner who touches a general ledger needs this skill on day one. It's the single most common topic tested in bookkeeping certification exams (NACPB, AIPB) and the first thing an employer checks when screening a new hire — can this person tell me, without hesitating, what happens when we buy a truck on credit? Firms lose money when staff post entries backwards, because it silently throws off account balances until someone catches it during reconciliation, sometimes months later.
Learning objectives
- State the accounting equation.
- Know which accounts are increased by debits vs credits.
- Record a simple journal entry.
Background concepts
The accounting equation is the whole story
Assets = Liabilities + Equity. This one equation is the reason double-entry bookkeeping exists. Every transaction your business records has to keep both sides equal, which is exactly why every entry needs at least one debit and one credit of equal value. If you understand this equation cold, debits and credits stop being arbitrary rules and become a logical consequence of keeping the equation balanced.
- Assets: cash, accounts receivable, inventory, equipment, buildings — things the business owns or is owed.
- Liabilities: accounts payable, loans payable, unearned revenue — things the business owes.
- Equity: owner's capital, retained earnings, draws — the owner's residual claim on the assets.
Debit and credit are just "left" and "right"
Forget good/bad, increase/decrease as a starting point. A debit is simply an entry on the left side of a T-account. A credit is an entry on the right side. Whether "left" means an increase or a decrease depends entirely on which type of account you're looking at. That's the part people skip, and it's the part that actually matters.
The DEALER trick
A memory device that holds up under pressure: DEALER splits into two halves. Debits increase Dividends/Draws, Expenses, Assets, Losses. Credits increase Equity, Liabilities, Revenue. Say it enough times and it becomes automatic — but always be ready to check it against the accounting equation if you're unsure.
- Debit increases: Assets, Expenses, Dividends/Draws
- Credit increases: Liabilities, Equity, Revenue
- Debit decreases: Liabilities, Equity, Revenue
- Credit decreases: Assets, Expenses, Dividends/Draws
The T-account
A T-account is a simple visual: the account name on top, a vertical line splitting debits (left) from credits (right). Bookkeepers sketch these constantly, even mentally, to check whether an entry makes sense before posting it to software.
Cash
Debit | Credit
---------------------
1,000 | 400
500 |
---------------------
Balance: 1,100 (debit side wins, since Cash is an asset)Step-by-step
1. Step 1: Identify every account touched by the transaction
Read the transaction and name the accounts involved — usually two, sometimes more. Example: "Paid $200 cash for office supplies." The accounts are Cash and Supplies Expense (or Supplies, if treated as an asset until used).
2. Step 2: Classify each account by type
Label each account as Asset, Liability, Equity, Revenue, or Expense. In the example above, Cash is an Asset and Supplies Expense is an Expense.
3. Step 3: Decide whether each account is increasing or decreasing
Cash is decreasing (money left the business). Supplies Expense is increasing (a new cost was incurred).
4. Step 4: Apply the debit/credit rule for that account type and direction
Expense increasing = debit. Asset decreasing = credit. So: Debit Supplies Expense $200, Credit Cash $200.
5. Step 5: Write the formal entry and confirm it balances
List debits first, flush left, then credits indented below. The total debits must equal total credits every single time — no exceptions.
Date: 03/14
Dr Supplies Expense ......... 200
Cr Cash .................... 200
(Purchased office supplies with cash)6. Step 6: Practice with a revenue transaction
"Received $1,500 cash for services performed." Cash (Asset) increases → debit. Service Revenue increases → credit.
Date: 03/15
Dr Cash ...................... 1,500
Cr Service Revenue .......... 1,500
(Cash received for services rendered)7. Step 7: Practice with a liability transaction
"Bought $3,000 of equipment on account (to be paid later)." Equipment (Asset) increases → debit. Accounts Payable (Liability) increases → credit.
Date: 03/16
Dr Equipment .................. 3,000
Cr Accounts Payable .......... 3,000
(Purchased equipment on credit)8. Step 8: Practice with an equity transaction
"Owner withdrew $500 cash for personal use." Owner's Draws (contra-equity) increases → debit. Cash (Asset) decreases → credit.
Date: 03/17
Dr Owner's Draws ................. 500
Cr Cash ......................... 500
(Owner withdrawal for personal use)9. Step 9: Build the habit of checking the equation
After posting any entry, ask: does Assets still equal Liabilities + Equity? If a transaction increases an asset and increases a liability by the same amount, the equation holds. Run this sanity check until it's automatic — it catches almost every backwards entry before it does damage.
Real-world workplace examples
Retail store buys inventory on credit
A boutique orders $4,000 of merchandise from a supplier, payable in 30 days. Inventory (Asset) goes up, Accounts Payable (Liability) goes up.
Dr Inventory 4,000 / Cr Accounts Payable 4,000
Freelancer gets paid by a client
A freelance designer receives $2,200 by bank transfer for a completed project. Cash (Asset) increases, Service Revenue increases.
Dr Cash 2,200 / Cr Service Revenue 2,200
Company pays down a loan
A business pays $1,000 toward its bank loan: $850 principal, $150 interest. Loan Payable decreases (debit), Interest Expense increases (debit), Cash decreases (credit).
Dr Loan Payable 850 / Dr Interest Expense 150 / Cr Cash 1,000
Nonprofit records a cash donation
A nonprofit receives a $5,000 unrestricted donation. Cash (Asset) increases, Contribution Revenue increases.
Dr Cash 5,000 / Cr Contribution Revenue 5,000
Bookkeeper corrects a bank fee
The bank charges a $35 monthly service fee, automatically deducted. Cash decreases, Bank Fees Expense increases.
Dr Bank Fees Expense 35 / Cr Cash 35
Practical scenarios
A new bookkeeper posts revenue backwards
Jordan, three weeks into a bookkeeping job, records a $6,000 client payment as Debit Service Revenue / Credit Cash instead of the reverse. At month-end, the bank reconciliation won't tie out: the book balance is $12,000 lower than the actual bank balance ($6,000 too low from the wrong debit to cash, compounded because revenue should have gone up but instead went down by $6,000). Jordan traces the discrepancy by pulling every cash-related entry for the month and rechecking each against the DEALER rule. Cash is an asset; receiving cash means an asset increase, which is always a debit — never a credit unless cash is leaving. The lesson: when confused, don't guess, walk back to the accounting equation and check whether the account is increasing or decreasing, then apply the rule for that account type.
A small business owner mixes up loan proceeds
A bakery owner takes out a $20,000 equipment loan and deposits it directly into the business bank account, then separately buys a $20,000 oven with the cash. If the owner records only "Debit Equipment $20,000 / Credit Cash $20,000" and forgets to record the loan proceeds hitting the bank account first, the books will show cash dropping by $20,000 with no matching increase from the loan, throwing the equation out of balance by $20,000 on the asset side. The correct sequence is two entries: first Dr Cash 20,000 / Cr Loan Payable 20,000 when the loan funds arrive, then Dr Equipment 20,000 / Cr Cash 20,000 when the oven is purchased. Treating a multi-step transaction as a single entry is a common error that this scenario is designed to catch.
Common mistakes beginners make
Confusing bank-statement language with accounting language
Your bank calls a deposit into your account a "credit" because from the bank's perspective, you're a liability on their books (money they owe you), so an increase there is a credit. From your own books' perspective, that same deposit is a debit to your Cash asset. The fix: always reason from your own chart of accounts, never from the vocabulary printed on a bank statement.
Memorizing DEALER without understanding why
Students who memorize DEALER as a magic spell freeze the moment a transaction doesn't fit an obvious pattern (like a contra-account or a refund). The fix: practice deriving the rule from the accounting equation every time until it becomes second nature, rather than leaning on the mnemonic as your only tool.
Assuming debit always means 'increase'
New bookkeepers often assume debit = increase in general, then apply that to a liability or revenue account and get it backwards. The fix: always classify the account type first (asset/liability/equity/revenue/expense), then apply the direction rule for that specific type.
Forgetting that a single transaction can touch more than two accounts
A payroll entry, for example, touches Wages Expense, several tax liability accounts, and Cash all at once. Trying to force every transaction into a simple two-line entry leads to skipped accounts. The fix: list every account genuinely affected before assigning debits and credits, and confirm total debits equal total credits at the end, not just two lines.
Not double-checking that entries balance before moving on
It's tempting to post quickly and move to the next transaction. Small imbalances compound over a month and become nightmarish to trace. The fix: add up debits and credits on every single entry before you close it out, every time, no exceptions.
Best practices
- Always classify the account type (A/L/E/R/Ex) before deciding debit or credit.
- Write out full T-accounts on paper when a transaction feels unfamiliar.
- Check that total debits equal total credits before considering any entry finished.
- Use the accounting equation as your ultimate tiebreaker when a mnemonic fails you.
- Keep a printed DEALER chart at your desk during your first few months on the job.
- Never rely on bank statement wording ("credit" on a deposit) to reason about your own books.
- Practice with real invoices and receipts, not just textbook examples — real documents are messier and better practice.
- When in doubt about a new or unusual account, ask: is this ultimately increasing an asset/expense, or a liability/equity/revenue?
Professional tips
- Say the account type out loud before deciding debit or credit — verbalizing forces the classification step you might otherwise skip.
- Contra-accounts (like Accumulated Depreciation or Owner's Draws) follow the opposite normal balance of their parent category — learn these as exceptions early.
- If an entry doesn't balance, don't hunt line by line — recompute each account's classification from scratch; the error is almost always a misclassification, not arithmetic.
- Build muscle memory with at least 50 practice transactions before touching live client books.
- Keep a running personal glossary of tricky accounts you encounter (e.g., Unearned Revenue, Prepaid Insurance) with their normal balance noted.
- In software like QuickBooks, the "increase/decrease" language on data-entry screens can mask the underlying debit/credit — periodically check the actual journal entry view to keep your fundamentals sharp.
Practice exercises
Exercise 1: Classify and journalize
The owner invests $15,000 cash into the business to start it. Identify the accounts, classify them, and write the full entry.
Solution: Cash (Asset) increases -> Debit Owner's Capital (Equity) increases -> Credit Dr Cash 15,000 / Cr Owner's Capital 15,000
Exercise 2: Multi-account entry
The business pays $2,400 for a 12-month insurance policy upfront, recorded as a prepaid asset. Journalize it.
Solution: Prepaid Insurance (Asset) increases -> Debit Cash (Asset) decreases -> Credit Dr Prepaid Insurance 2,400 / Cr Cash 2,400
Exercise 3: Liability payoff
The company pays off a $1,200 accounts payable balance in cash. Journalize it.
Solution: Accounts Payable (Liability) decreases -> Debit Cash (Asset) decreases -> Credit Dr Accounts Payable 1,200 / Cr Cash 1,200
Exercise 4: Revenue earned but not yet collected
A consulting firm bills a client $3,000 for work completed this month; payment is expected next month. Journalize it.
Solution: Accounts Receivable (Asset) increases -> Debit Service Revenue (Revenue) increases -> Credit Dr Accounts Receivable 3,000 / Cr Service Revenue 3,000
Review questions
What does a debit mean for an Asset account?
It increases the balance — Assets carry a normal debit balance, so debits add to them and credits subtract.
Why must every journal entry have equal debits and credits?
Because the accounting equation (Assets = Liabilities + Equity) must always stay in balance; equal debits and credits is the mechanical way double-entry bookkeeping enforces that.
How do you determine whether a credit increases or decreases an account?
It depends on the account's type: credits increase Liabilities, Equity, and Revenue, and decrease Assets and Expenses.
What is a T-account used for?
It's a visual tool showing debits on the left and credits on the right of a single account, used to track and verify balances before posting to the general ledger.
Give an example of a transaction that increases one asset and decreases another.
Paying cash to purchase equipment: Equipment (Asset) increases with a debit, Cash (Asset) decreases with a credit — total assets stay the same, just reallocated.
Why is it risky to rely purely on the DEALER mnemonic?
It's a shortcut, not a substitute for understanding; unusual accounts (contra-accounts, adjusting entries) can break the pattern if you don't also know how to reason from the accounting equation.
Key takeaways
- Assets = Liabilities + Equity is the foundation every debit/credit decision rests on.
- Debit means left side; credit means right side — direction of increase depends on account type.
- DEALER: Debits increase Dividends/Draws, Expenses, Assets, Losses; credits increase Equity, Liabilities, Revenue.
- Every journal entry must have equal total debits and credits.
- Bank statement language ("credit" your account) is the opposite perspective from your own books.
- T-accounts are a fast way to sanity-check a transaction before posting it.
- When confused, reclassify the account type first, then apply the rule — don't guess.
- Practice on real transactions, not just textbook examples, to build genuine fluency.
Frequently asked questions
Is a debit always a good thing and a credit always bad?
No — debit and credit are neutral directional terms (left/right), not judgments. A debit can increase an expense (bad for profit) or increase cash (good).
Why does my bank call my deposit a 'credit'?
Because from the bank's point of view, your deposit increases what they owe you, and liabilities increase with credits on their books — it's their books, not yours.
Do all businesses use debits and credits the same way?
Yes, the fundamental rules are universal under double-entry bookkeeping (GAAP and IFRS both rely on this system), though the specific chart of accounts varies by company.
What happens if my debits and credits don't match?
The trial balance won't balance, signaling an error somewhere that must be found and corrected before financial statements can be trusted.
Can one transaction have more than one debit or more than one credit?
Yes — as long as total debits equal total credits, an entry can have multiple lines on either side (called a compound entry).
How long does it take to get comfortable with debits and credits?
Most learners need a few weeks of regular practice — dozens of transactions — before the rules feel automatic rather than something to look up.
Is there a shortcut besides DEALER?
Some learners prefer thinking in terms of the accounting equation directly: whichever side of the equation an account sits on determines its normal balance and direction of increase.
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