Single-entry bookkeeping is a list: money in, money out, a running balance. It is how most people start, and it works until someone asks a question the list cannot answer — how much do customers owe us, what is the van worth now, did that loan payment reduce the debt or count as an expense? Double entry answers those questions because it records where every amount came from and where it went.
The equation behind it
Everything a business owns (assets) was paid for either by someone it owes (liabilities) or by its owners (equity). Assets = Liabilities + Equity. Income increases equity and expenses reduce it. Each transaction changes at least two parts of that equation by the same amount, so the equation never stops balancing — and if it does, there is a mistake to find.
Debit and credit, without the confusion
Debit means left, credit means right. That is all. They are not "good" and "bad", and a credit on your bank statement means something different from a credit in your books, because the bank is looking at your account from its side. What matters is which accounts increase on which side:
| Account type | Increases with | Examples |
|---|---|---|
| Assets | Debit | Bank, receivables, stock, equipment |
| Expenses | Debit | Rent, salaries, cost of sales |
| Liabilities | Credit | Payables, loans, tax owed |
| Equity | Credit | Owner's capital, retained earnings |
| Income | Credit | Sales, interest received |
Five entries every business makes
| What happened | Debit | Credit |
|---|---|---|
| Owner puts 5,000 into the business | Bank 5,000 | Owner's capital 5,000 |
| Invoice a customer 1,000 | Receivables 1,000 | Sales 1,000 |
| Customer pays the invoice | Bank 1,000 | Receivables 1,000 |
| Pay 600 rent | Rent expense 600 | Bank 600 |
| Buy a laptop for 1,200 on supplier credit | Equipment 1,200 | Payables 1,200 |
The point is not the balancing. It is that every number on the balance sheet can be traced back to the transactions that made it.
Questions people actually ask
What is double-entry bookkeeping in simple terms?
A method where every transaction is recorded in at least two accounts — one debit and one credit of equal value — so the books always balance and every amount can be traced.
Do small businesses need double-entry accounting?
Not always by law, but in practice yes once you invoice on credit, hold stock, borrow, or need a balance sheet. Accounting software makes it no more work than single entry.
What does a trial balance prove?
That total debits equal total credits. It does not prove every entry is in the right account — a correctly balanced entry to the wrong account still balances.
Where these facts come from
Checked against the following on 15 October 2026. Rules and dates change — if you are reading this long after that date, verify before you act on it.
WisoBooks is a bookkeeping and business-management tool, not an accounting, tax or legal advisor. Nothing on this page is tax advice, and tax rules change. Confirm your own obligations with the relevant authority or a qualified advisor.
