A free, interactive course that makes debits and credits click. No boring textbooks — just hands-on learning with visual T-accounts, drag-and-drop exercises, and instant feedback.
Start Learning — It's FreeImagine you buy a laptop for your business for $1,000. Simple, right? Your cash goes down by $1,000. But where did the money go? You now own a laptop worth $1,000. The money didn't vanish — it transformed.
Every financial transaction has two equal and opposite effects. Money never appears from nowhere or disappears — it always moves from one place to another. Double-entry accounting tracks BOTH sides of every transaction.
Double-entry bookkeeping was formalized in 1494 by an Italian monk named Luca Pacioli — but merchants in Venice had been using it for over a century before that. It's survived 500+ years because it works brilliantly.
Fun Fact: Luca Pacioli was friends with Leonardo da Vinci. Da Vinci actually illustrated one of Pacioli's math books! The Renaissance was truly the age of multitaskers.
Single-entry is like a personal checkbook — you just track money in and out. It works for a lemonade stand, but it can't answer questions like:
Double-entry records both sides of every transaction, creating a complete financial picture. It's the difference between a blurry snapshot and a 4K video.
See? The books stay balanced. Your total assets haven't changed — they just shifted form. This is the magic of double-entry.
1. Why does double-entry accounting record two entries for every transaction?
Here's a secret that accounting professors don't tell you on day one: Debit simply means LEFT. Credit simply means RIGHT. That's it.
Your bank says "credit" when money comes IN and "debit" when it goes OUT. That's because you're seeing YOUR account from the BANK'S perspective. In accounting, we use the original meaning: Debit = Left side. Credit = Right side.
Every account has two sides — a Debit (left) side and a Credit (right) side. When you record a transaction, you put amounts on the left or right side of the affected accounts.
For every transaction: Total Debits MUST equal Total Credits. Always. No exceptions. This is what keeps the books balanced.
Think of a card dealer at a casino — the first three cards they deal you go left (Debit), the last three go right (Credit):
D, E, A increase with a Debit (left side) | L, E, R increase with a Credit (right side)
What you own
What you spend
What you owe
Owner's value
What you earn
1. In accounting, "Debit" means:
2. To increase an Asset account, you:
Here's the good news: Kantivo handles the debits and credits automatically. When you record a payment, invoice, or expense, the software creates the perfectly balanced journal entry for you. Understanding the "why" just makes you a smarter business owner — but you'll never have to do this math by hand.
Try Kantivo free for 30 days →No matter how complex a business gets, every single account falls into one of these five types. Master these and you can categorize anything.
Things your business owns or is owed
Things your business owes
The owner's stake in the business
Money your business earns
Money your business spends to operate
Assets, Liabilities, and Equity are permanent accounts — they carry balances from year to year (they appear on the Balance Sheet).
Revenue and Expenses are temporary — they reset to zero at year-end (they appear on the Income Statement).
If double-entry accounting had a tattoo, it would be this:
This equation must ALWAYS balance. After every single transaction, the left side must equal the right side. If it doesn't, something is wrong.
Imagine you start a business:
Step 1: You invest $10,000 of your own money
$10,000 = $10,000 ✓
Step 2: You borrow $5,000 from the bank
$15,000 = $15,000 ✓
Step 3: You buy equipment for $3,000 cash
$15,000 = $15,000 ✓
Notice: In Step 3, cash went down but equipment went up by the same amount. The total assets stayed at $15,000. The equation STILL balances because we moved value between asset accounts.
A business has $50,000 in assets and $20,000 in liabilities. How much equity does it have?
If you buy a $500 desk with cash, what happens to total assets?
A journal entry is how you officially record a transaction. It's the bread and butter of accounting. Every entry needs:
| Account | Debit | Credit |
|---|---|---|
| Rent Expense (Expense ↑) | $1,200 | |
| Cash / Bank (Asset ↓) | $1,200 |
Expenses increase with debits — remember DEALER: Dividends, Expenses, Assets increase with debits; Liabilities, Equity, Revenue increase with credits. Rent Expense is an expense, so we debit it to increase it. Cash is an asset that's decreasing, so we credit it. Debit = Credit. Balanced!
| Account | Debit | Credit |
|---|---|---|
Kantivo auto-generates journal entries when you record invoices, payments, bills, and expenses. One click and it's done — perfectly balanced every time. Learning the fundamentals here just helps you understand what's happening under the hood, so you're always in control.
See how Kantivo automates journal entries →A T-Account is a visual way to see what's happening inside each account. It gets its name from its T-shape. Let's post some transactions!
Transaction 1: Owner invests $20,000 cash
Transaction 2: Buys espresso machine for $5,000 cash
Transaction 3: Earns $2,500 in first week sales (cash)
Cash debits: $20,000 + $2,500 = $22,500
Cash credits: $5,000
Cash balance: $22,500 - $5,000 = $17,500
After all 3 transactions, what is the Cash account balance?
A Trial Balance is a report that lists ALL accounts and their balances at a point in time. Its purpose: verify that total debits equal total credits.
Typically at month-end or year-end, before preparing financial statements. If it doesn't balance, you know there's an error somewhere in your entries.
Using the transactions from Lesson 6:
| Account | Debit | Credit |
|---|---|---|
| Cash | $17,500 | |
| Equipment | $5,000 | |
| Owner's Equity | $20,000 | |
| Sales Revenue | $2,500 | |
| TOTALS | $22,500 | $22,500 |
Debits = Credits. The books are balanced!
Important: A balanced trial balance doesn't guarantee zero errors. It can still miss errors of omission (forgot a transaction), errors of commission (posted to wrong account), or compensating errors. But it catches the most common mistakes!
A trial balance shows total debits of $45,000 and total credits of $44,000. What does this tell you?
Time to practice everything you've learned! Use the sandbox below to record journal entries and watch the T-accounts update in real time.
Record these 5 transactions in the sandbox above and verify the trial balance stays balanced:
Cash balance: $18,500 | Equipment: $8,000 | Rent Expense: $1,500 | Salaries Expense: $3,000 | Owner's Equity: $25,000 | Service Revenue: $6,000
Total Debits = Total Credits = $31,000
Kantivo gives you auto-balancing entries, one-click financial reports, smart invoicing, and multi-currency support — all without the accounting headaches. Everything you practiced here happens automatically in the app. Zero math required.
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