Debits and credits (the piggy bank version)

Let's kill the fear right now.

Debit does not mean bad. Credit does not mean good. They don't mean "money out" and "money in" either, whatever your bank app suggests.

Why two sides at all?

Here's the beautiful idea. Every time money moves, two things happen — not one.

You buy a $30 book with cash. Most people see one event: "I spent $30." But there are two:

1. 1Your cash went down by $30.
2. 2Your books went up by $30.

Nothing vanished. Value just changed shape. Recording both halves is called double-entry bookkeeping, and it's why the system has survived since 1494.

The five buckets

Everything in a business goes in one of five buckets. Learn these and you're most of the way there.

The one rule to memorise

There's only one, and it's short:

Debit what comes in, credit what goes out.

Or, the version that covers every case:

• Debit increases: Assets and Expenses
• Credit increases: Liabilities, Equity and Income

Let's actually do one

You buy a $30 book with cash.

• Books (an asset) came in → Debit Books $30
• Cash (an asset) went out → Credit Cash $30

Both sides total 30. Balanced. ✅

You get $500 as a gift from a parent.

• Cash came in → Debit Cash $500
• It came from your parent, who now effectively "owns" that contribution → Credit Capital $500

You pay $100 rent.

• Rent is an expense, and expenses increase with debits → Debit Rent $100
• Cash went out → Credit Cash $100

The magic check

Add up every debit in the whole business. Add up every credit. They must be equal. Always. Forever.

If they aren't, you made a mistake, and you know it the same day rather than a year later in an audit. That's the entire genius of the system, and it's why a monk from 1494 is still running the world economy.