Debit and Credit Explained: Exercises and Mastery (Part 6)
A practical practice guide to help beginners test, strengthen, and master debit and credit through real accounting exercises.
Why Practice Turns Debit and Credit Into Common Sense
Debit and credit are not mastered by reading definitions alone.
They become clear through practice.
At first, you may need to think slowly:
- What accounts changed?
- Did each account increase or decrease?
- What type of account is each one?
- Which side records the change?
That is normal.
Even experienced accountants learned debit and credit by repeating the same logic many times until the pattern became natural.
The goal is not memorization. The goal is recognition.
When you recognize the account type and whether it increased or decreased, the debit or credit becomes much easier.
The Final Rule Table Before the Exercises
Keep this table beside you as you work through the exercises.
| Account Type | Examples | Increases With | Decreases With |
|---|---|---|---|
| Assets | Cash, inventory, equipment, receivables | Debit | Credit |
| Expenses | Rent, salaries, utilities, advertising | Debit | Credit |
| Liabilities | Loans, payables, taxes payable | Credit | Debit |
| Equity | Owner capital, retained earnings | Credit | Debit |
| Revenue | Sales, service income, fees earned | Credit | Debit |
DEA increases with Debits. LER increases with Credits.
Exercise Set 1: Identify the Debit and Credit
For each transaction, identify the correct debit and credit. The answers are included so you can check your thinking.
| No. | Transaction | Debit | Credit |
|---|---|---|---|
| 1 | Owner invests $8,000 cash into the business | Cash $8,000 | Owner Capital $8,000 |
| 2 | Business borrows $12,000 from the bank | Cash $12,000 | Loan Payable $12,000 |
| 3 | Pay office rent $900 | Rent Expense $900 | Cash $900 |
| 4 | Sell services for $1,400 cash | Cash $1,400 | Service Revenue $1,400 |
| 5 | Buy supplies on credit for $300 | Supplies $300 | Accounts Payable $300 |
| 6 | Pay supplier $300 previously owed | Accounts Payable $300 | Cash $300 |
| 7 | Pay salaries $2,000 | Salary Expense $2,000 | Cash $2,000 |
| 8 | Customer pays $600 owed from earlier invoice | Cash $600 | Accounts Receivable $600 |
| 9 | Receive electricity bill for $250, unpaid | Utilities Expense $250 | Accounts Payable $250 |
| 10 | Owner withdraws $500 cash | Owner Drawings $500 | Cash $500 |
Exercise Set 2: Explain Why the Entry Works
This section is more important than memorizing entries. Try to understand why each debit and credit is used.
Question 1: Why is Rent Expense debited when rent is paid?
A business pays $1,000 rent in cash.
| Debit | Credit |
|---|---|
| Rent Expense $1,000 | Cash $1,000 |
Answer: Rent Expense is an expense account. Expenses increase with debits. Cash is an asset, and cash decreased, so Cash is credited.
Question 2: Why is Service Revenue credited when services are provided?
A business provides services for $1,500 cash.
| Debit | Credit |
|---|---|
| Cash $1,500 | Service Revenue $1,500 |
Answer: Service Revenue is a revenue account. Revenue increases with credits. Cash is an asset, and cash increased, so Cash is debited.
Question 3: Why is Accounts Payable credited when inventory is bought on credit?
A business buys inventory for $2,000 and will pay later.
| Debit | Credit |
|---|---|
| Inventory $2,000 | Accounts Payable $2,000 |
Answer: Inventory is an asset, and assets increase with debits. Accounts Payable is a liability. The business now owes more to the supplier, so the liability increased. Liabilities increase with credits.
Question 4: Why is Accounts Receivable debited when a customer will pay later?
A business completes service work worth $900, but the customer will pay later.
| Debit | Credit |
|---|---|
| Accounts Receivable $900 | Service Revenue $900 |
Answer: Accounts Receivable is an asset because it represents money owed to the business. Assets increase with debits. Service Revenue is revenue, and revenue increases with credits.
Exercise Set 3: Choose the Account Type
Before choosing debit or credit, you must know the account type. Identify whether each account is an Asset, Liability, Equity, Revenue, or Expense.
| Account | Account Type | Reason |
|---|---|---|
| Cash | Asset | The business owns or controls it. |
| Accounts Payable | Liability | The business owes money to others. |
| Sales Revenue | Revenue | The business earned income. |
| Rent Expense | Expense | The business consumed a rental benefit. |
| Owner Capital | Equity | It represents the owner’s claim in the business. |
| Inventory | Asset | The business owns goods that can be sold. |
| Loan Payable | Liability | The business owes the bank. |
| Salary Expense | Expense | The business incurred employee labor cost. |
| Service Revenue | Revenue | The business earned income from services. |
| Equipment | Asset | The business owns useful equipment. |
Exercise Set 4: Apply the Four-Step Method
Now let us apply the complete four-step method slowly.
Example A: Buying Equipment for Cash
The business buys equipment for $3,000 cash.
| Step | Answer |
|---|---|
| 1. Accounts changed | Equipment and Cash |
| 2. Increase or decrease | Equipment increased. Cash decreased. |
| 3. Account type | Both Equipment and Cash are assets. |
| 4. Debit or credit | Assets increase with debits and decrease with credits. |
| Debit | Credit |
|---|---|
| Equipment $3,000 | Cash $3,000 |
Example B: Buying Inventory on Credit
The business buys inventory for $5,000 and will pay the supplier later.
| Step | Answer |
|---|---|
| 1. Accounts changed | Inventory and Accounts Payable |
| 2. Increase or decrease | Inventory increased. Accounts Payable increased. |
| 3. Account type | Inventory is an asset. Accounts Payable is a liability. |
| 4. Debit or credit | Assets increase with debits. Liabilities increase with credits. |
| Debit | Credit |
|---|---|
| Inventory $5,000 | Accounts Payable $5,000 |
Example C: Receiving Cash From a Customer for Work Already Done
The customer pays $1,100 for service work completed today.
| Step | Answer |
|---|---|
| 1. Accounts changed | Cash and Service Revenue |
| 2. Increase or decrease | Cash increased. Service Revenue increased. |
| 3. Account type | Cash is an asset. Service Revenue is revenue. |
| 4. Debit or credit | Assets increase with debits. Revenue increases with credits. |
| Debit | Credit |
|---|---|
| Cash $1,100 | Service Revenue $1,100 |
Exercise Set 5: Common Trap Questions
These examples are designed to catch common beginner mistakes.
Trap 1: Cash Received Before Work Is Done
A customer pays $1,000 in advance for services to be provided next month.
Wrong thinking: Cash received means revenue.
Correct thinking: The business has received cash, but it has not yet earned revenue. It owes the customer the service.
| Debit | Credit |
|---|---|
| Cash $1,000 | Unearned Revenue $1,000 |
Trap 2: Paying a Loan
The business pays $1,500 to the bank. Of this amount, $1,200 reduces the loan principal and $300 is interest.
Wrong thinking: The full $1,500 is expense.
Correct thinking: Only the interest is expense. The principal reduces liability.
| Debit | Credit |
|---|---|
| Loan Payable $1,200 Interest Expense $300 |
Cash $1,500 |
Trap 3: Customer Pays an Old Invoice
A customer pays $800 that was previously recorded as Accounts Receivable.
Wrong thinking: Customer payment means new revenue.
Correct thinking: Revenue was already recorded earlier. This payment simply converts Accounts Receivable into Cash.
| Debit | Credit |
|---|---|
| Cash $800 | Accounts Receivable $800 |
Trap 4: Buying a Computer
The business buys a computer for $1,200 cash.
Wrong thinking: Cash paid means expense.
Correct thinking: The business still owns the computer. It is an asset, not an immediate expense.
| Debit | Credit |
|---|---|
| Computer Equipment $1,200 | Cash $1,200 |
Exercise Set 6: Fill-in-the-Blank Review
Use these blanks to test whether the core rules are now clear.
| Statement | Answer |
|---|---|
| Assets increase with ______. | Debits |
| Assets decrease with ______. | Credits |
| Liabilities increase with ______. | Credits |
| Liabilities decrease with ______. | Debits |
| Revenue increases with ______. | Credits |
| Expenses increase with ______. | Debits |
| Equity increases with ______. | Credits |
| Debit means the ______ side. | Left |
| Credit means the ______ side. | Right |
| Every transaction affects at least ______ accounts. | Two |
The Final Mastery Checklist
You have understood the beginner foundation of debit and credit if you can confidently say yes to the following:
- I know that debit means left.
- I know that credit means right.
- I know that debit does not always mean increase.
- I know that credit does not always mean decrease.
- I know that assets increase with debits.
- I know that expenses increase with debits.
- I know that liabilities increase with credits.
- I know that equity increases with credits.
- I know that revenue increases with credits.
- I know that every transaction affects at least two accounts.
- I know that total debits must equal total credits.
- I know that cash received is not always revenue.
- I know that cash paid is not always expense.
- I know that customer deposits may be liabilities until earned.
- I know that loan principal and loan interest are not the same thing.
When those statements make sense, you are no longer guessing. You are thinking like an accountant.
The One-Sentence Summary
Debit and credit are the left and right sides of accounting used to record both effects of every business transaction so the accounting equation stays balanced.
That sentence is the heart of double-entry accounting.
Whenever a transaction happens, accounting asks:
- What changed?
- Did it increase or decrease?
- What type of account is it?
- Which side records that change?
Once you can answer those questions, debit and credit stop being mysterious.
Where Confidence Begins
Accounting often looks difficult because beginners are shown the final journal entry before they understand the thinking process behind it.
But once the logic becomes clear, debit and credit are not strange words anymore.
They are simply a system for keeping track of business reality.
Cash came in.
Revenue was earned.
A bill was incurred.
A supplier was paid.
An asset was bought.
A loan was reduced.
Each transaction tells a story.
Debit and credit are the language used to write that story clearly, consistently, and accurately.
Do not memorize blindly. Understand the movement.
That is how debit and credit finally begin to make sense.