Double-entry bookkeeping for business owners
Double entry is not an accounting convention invented to make life difficult. It is an error-detection system: every transaction is recorded twice, in opposite directions, so that if the two sides do not agree, something is wrong and you find out immediately rather than in March.
| Account | Dr | Cr |
|---|---|---|
| Customer (receivable) | 11,800.00 | — |
| Sales | — | 10,000.00 |
| Output GST | — | 1,800.00 |
The ideas, in order
Debit and credit are directions
They do not mean good and bad, or increase and decrease. Debit is the left side and credit the right, and which one increases an account depends on what kind of account it is.
The accounting equation
Assets equal liabilities plus capital. Every transaction keeps that true, which is the reason both sides of an entry have to agree.
Five types of account
Assets, liabilities, capital, income and expenses. Assets and expenses increase on the debit side; liabilities, capital and income increase on the credit side.
Every transaction has two sides
You did not just receive money; you received money AND reduced what a customer owed. Recording only one half is single-entry bookkeeping, which is what a spreadsheet usually is.
The trial balance
Add every debit and every credit. If they do not match, there is an error. That check is the entire practical value of the system.
What it buys you
A balance sheet, a profit figure you can defend, and the ability to find a mistake rather than discover a discrepancy you cannot explain.
How to read an entry
- Ask what came in. Cash, stock, a receivable, a service consumed. That is usually the debit.
- Ask what it came from. A sale, a loan, a supplier, the owner. That is usually the credit.
- Check they are equal. If they are not, one side is incomplete — most often a tax or discount line.
- Read the effect. On the profit and loss if it is income or expense, on the balance sheet if it is an asset, liability or capital.
Bookkeeping questions
Do I need double-entry bookkeeping for a small business?
If anyone outside the business reads your accounts — a bank, an investor, the tax authority, a buyer — then yes, and starting sooner is far cheaper than converting later. If nobody does, a simple record may be enough for now, but the transition tends to arrive without warning.
What does it mean when the trial balance does not tie?
That there is an error, which is exactly what the system is for. A single-sided entry, a transposed figure or a missing tax line are the usual causes, and the system tells you to look rather than letting the mistake pass silently.
Is a spreadsheet double-entry bookkeeping?
Almost never. A spreadsheet usually records one side of each transaction — a list of sales, a list of payments — with no mechanism forcing them to agree, which is why stock and cash drift apart in spreadsheet-run businesses.
Do I have to understand debits and credits to use accounting software?
Not for day-to-day work — raising an invoice or entering a payment posts the entry for you. Understanding them helps enormously when something looks wrong, which is the moment it matters.
Related
Let the software keep both sides
Every document in tBiz posts a balanced voucher, so the trial balance is the system’s own.