Study Tips
How to Master Double-Entry Accounting (Debits and Credits Explained)
By Sana Iqbal · · 8 min read
Quick answer
Double-entry works because every transaction has two sides: something is gained and something is given up. Debits increase assets and expenses; credits increase liabilities, capital and income. Once you understand the accounting equation behind those rules — assets equal liabilities plus capital — you can reason out any entry instead of memorising a table you will forget under exam pressure.
Start with the accounting equation
Everything in double-entry rests on one identity: assets equal liabilities plus capital. The business owns things, and every one of those things was funded either by someone the business owes (a liability) or by the owner (capital). That equation must always balance, which is precisely why every entry has two sides.
If you truly understand that sentence, you can derive the debit and credit rules rather than memorising them — and derived knowledge survives exam stress in a way that memorised tables do not.
What debit and credit actually mean
Forget the everyday banking sense of the words; they are not good and bad. In bookkeeping, debit simply means the left side of an account and credit the right side. That is all. The rules follow from keeping the equation in balance.
Debits increase assets and expenses and decrease liabilities, capital and income. Credits do the reverse. Write that once, understand why it follows from the equation, and stop treating it as a spell to be memorised.
The question to ask for every transaction
Ask two things: what has the business received, and what has it given up? The receiving account is debited; the giving account is credited. Buy stock for cash: the business receives inventory (debit) and gives up cash (credit). Simple, and it scales.
When you get stuck on an unfamiliar transaction, return to that question rather than hunting for the right row in a table. It works for every entry you will ever meet, including ones your textbook never showed you.
Where students consistently lose marks
Three places. Accruals and prepayments, because they require you to think about which period an expense belongs to rather than when cash moved. Depreciation, because it is a non-cash adjustment that feels artificial. And the difference between capital and revenue expenditure, which quietly determines whether something hits the profit statement or the balance sheet.
Each of these is a conceptual gap, not a calculation gap. Fix the concept and the calculations follow.
Accruals: the idea behind the rule
The accruals concept says we record income and expenses when they are earned or incurred, not when cash changes hands. That is the whole idea. Once it clicks, prepayments and accrued expenses stop being tricks and become obvious adjustments to get each period's profit honest.
Practise with full questions, not fragments
Doing isolated journal entries builds a false confidence. Work whole questions — from transactions through the ledger to the trial balance and final statements — because the mistakes that cost real marks usually appear when the pieces have to connect.
And when your trial balance does not balance, resist the urge to force it. Find the error; the process of finding it teaches you more than a dozen correct questions.
Every transaction has two sides — always
Double entry is not an arbitrary convention; it reflects a simple truth: every transaction changes at least two things. If you buy stock with cash, stock rises and cash falls. If you take a loan, cash rises and liabilities rise. Once you see transactions as movements between accounts, the debits and credits stop feeling like a code to memorise.
When you are stuck on an entry, ask two questions: what did the business receive, and what did it give up? The thing received is debited; the thing given is credited.
From ledger to statements
Students often learn entries and statements as separate topics, then panic when an exam links them. They are one chain: transactions become ledger entries, ledger balances become the trial balance, and the trial balance — after adjustments — becomes the income statement and balance sheet.
Work through that whole chain once, slowly, with a small set of transactions. That single exercise does more for understanding than a dozen isolated practice questions.
For further reading, Cambridge International is a reliable, authoritative source. When you are ready for personal help, explore our accounting tutoring or book a free demo session.
Frequently asked questions
Why is it called double entry?+
Because every transaction is recorded twice — once as a debit and once as a credit — so the accounting equation always balances. It is a self-checking system, which is why it has survived for centuries.
Do debits always mean money going out?+
No, and this is the most common confusion. Debit simply means the left side of an account. Buying inventory debits inventory (an asset increasing), even though it is not money going out of the business's ownership at all.
What if my trial balance doesn't balance?+
Something has been entered once, entered twice on the same side, or transposed. Check the difference — if it is divisible by nine, a transposition error is likely. Do not force the balance; find the error.
Which boards do you cover for accounting?+
We tutor accounting at O-Level, IGCSE and A-Level, including Cambridge (CIE), AQA and Edexcel specifications, and we teach to your board's exact requirements.
What is the easiest way to remember debits and credits?+
Rather than memorising rules, ask what the business received (debit) and what it gave up (credit). Students who rely on mnemonics alone tend to freeze on unfamiliar transactions, while those who reason from the transaction itself can handle anything.
Try your first session free
Meet your tutor, set your goals, and see the difference one-to-one attention makes. No card required, no commitment.