Double-Entry Accounting Explained
Table of Contents
A business can receive cash from a customer, a lender, or its owner. The bank balance rises in all three cases, but only the first might represent revenue. Double-entry accounting records what each transaction changes so that cash, debt, ownership, and profit remain distinct.
This guide explains the accounting equation, debit and credit rules, journal entries, and posting to T-accounts. You will follow eight connected transactions for a hypothetical U.S. service business and check the resulting balances. For the reports those records support, see how the three financial statements connect.
What Is Double-Entry Accounting?
Double-entry accounting records each transaction in at least two accounts, with total debits equal to total credits. An account is a record for one item, such as Cash or Rent Expense; the general ledger holds the business’s accounts. An entry can involve three or more accounts, provided its debit and credit totals agree.[1] [2]
Receiving a loan increases Cash and increases a liability. Collecting an existing customer invoice increases Cash and decreases Accounts Receivable. The second account explains why the cash changed.
“Double” does not mean recording the same revenue twice or entering every transaction twice in the same account. It means recording its linked effects.
The Accounting Equation
The relationship behind the system is:
- Assets include cash, amounts customers owe, and equipment.
- Liabilities include amounts owed to suppliers and lenders.
- Equity is the residual after subtracting liabilities from assets.
Every correctly recorded transaction preserves this equality. A cash equipment purchase can leave total assets unchanged by exchanging one asset for another. Borrowing increases both assets and liabilities.[6]
For a sole proprietorship with no other equity changes, the equity movement can be written as:
Revenue and expenses measure business performance; contributions and drawings record transactions with the owner. They affect equity for different reasons.[3] Choosing which items to recognize and how to measure them requires accounting guidance as well as balanced entries; the GAAP conceptual framework explains that broader foundation.
Debits, Credits, and Normal Balances
A debit is a left-side entry; a credit is a right-side entry. Neither word automatically means an increase, a decrease, something favorable, or something unfavorable. The account type determines the effect.[1]
The table shows the usual rules for ordinary accounts. A normal balance is the side on which that type of account normally carries its balance, which is also its increase side.[2]
| Account type | Increase | Decrease | Normal balance |
|---|---|---|---|
| Asset | Debit | Credit | Debit |
| Liability | Credit | Debit | Credit |
| Owner capital / ordinary equity | Credit | Debit | Credit |
| Revenue | Credit | Debit | Credit |
| Expense | Debit | Credit | Debit |
| Owner drawings / distributions | Debit | Credit | Debit |
For example, debiting Cash increases an asset, while debiting Notes Payable decreases a liability. Crediting Service Revenue increases revenue; crediting Cash decreases cash.
Normal is a guide, not a promise. A supplier overpayment can create a debit balance in a payable account. Contra accounts deliberately have the opposite normal balance from the category they reduce: accumulated depreciation, for example, normally has a credit balance against assets. Investigate an unexpected balance before deciding whether it is an error.[2] [3]
How to Write a Journal Entry
A journal records transactions in date order. Identify the accounts and their types, determine whether each increases or decreases, and then select the debit or credit side. List debit lines first and credit lines afterward; credit account titles are conventionally indented. Include the date and a short explanation.[4]
The simplified column tables below omit conventional account-title indentation; separate debit and credit columns identify each amount’s side. The worked example uses J1 through J8 as references linking each journal entry to its later ledger postings. A dash in a numeric column means no entry on that side. Each entry balances on its own; matching only the grand total could hide offsetting errors.
Double-Entry Accounting Example: Eight Transactions
Lakeview Design is a new sole proprietorship. All opening accounts are zero. The following eight events occur November 1–8 in an illustrative year; every amount is in U.S. dollars.
The business uses simplified accrual accounting. Its services are completed and satisfy the conditions for recognizing revenue. The equipment qualifies as an asset. The rent is incurred and paid for the short period illustrated, rather than paid in advance.
These are initial transaction entries before period-end adjustments. Ignore depreciation, accrued interest, taxes, credit losses, inventory, fees, and all other events. The final balances are unadjusted, rather than complete period-end financial statements.
J1: The Owner Contributes $12,000
On November 1, the owner deposits $12,000 into the business. Cash increases with a debit, and Owner Capital increases with a credit. The contribution is financing from the owner; Lakeview has not earned service revenue.
| Account | Debit | Credit |
|---|---|---|
| Cash | $12,000 | — |
| Owner Capital | — | $12,000 |
J2: The Business Borrows $5,000
On November 2, Lakeview receives $5,000 under a loan note. Cash and Notes Payable both increase. Borrowing creates an obligation to repay; it does not increase revenue or profit.
| Account | Debit | Credit |
|---|---|---|
| Cash | $5,000 | — |
| Notes Payable | — | $5,000 |
J3: Buy $4,000 of Equipment with Cash and Credit
On November 3, Lakeview receives equipment costing $4,000. It pays $1,500 immediately and owes the supplier $2,500. Debit Equipment for its full cost, credit Cash for the payment, and credit Accounts Payable for the unpaid amount. This is a compound entry involving three accounts.[4]
| Account | Debit | Credit |
|---|---|---|
| Equipment | $4,000 | — |
| Cash | — | $1,500 |
| Accounts Payable | — | $2,500 |
The debit equals $1,500 + $2,500 = $4,000 of credits. Equipment rises by $4,000 while cash falls by $1,500, so total assets rise by $2,500, matching the new payable. Capitalizing the equipment records an asset; its later depreciation is outside these initial entries.
J4: Earn and Collect $2,000 of Service Revenue
On November 4, Lakeview completes a service and receives $2,000 immediately. Cash increases with a debit and Service Revenue increases with a credit.
| Account | Debit | Credit |
|---|---|---|
| Cash | $2,000 | — |
| Service Revenue | — | $2,000 |
J5: Earn $3,000 on Credit
On November 5, Lakeview completes another service for $3,000 and invoices the customer for later payment. Because the assumed revenue-recognition conditions are satisfied, it records revenue now. The debit is to Accounts Receivable, the amount the customer owes, rather than Cash.
| Account | Debit | Credit |
|---|---|---|
| Accounts Receivable | $3,000 | — |
| Service Revenue | — | $3,000 |
“On credit” describes delayed payment here. It does not tell you which account to credit: the seller debits its receivable. Actual receivables also require attention to collection risk; see accounts receivable and bad-debt accounting.
J6: Collect $1,800 of the Existing Invoice
On November 6, the customer from J5 pays $1,800. Cash increases and Accounts Receivable decreases. The work already generated revenue in J5, so this collection creates no second revenue entry.
| Account | Debit | Credit |
|---|---|---|
| Cash | $1,800 | — |
| Accounts Receivable | — | $1,800 |
The unpaid balance is $3,000 − $1,800 = $1,200. Collection changes the composition of assets, leaving total assets unchanged.
J7: Incur and Pay $900 of Rent
On November 7, Lakeview incurs and pays $900 for the rental use assumed in this example. Rent Expense increases with a debit, while Cash decreases with a credit. The expense reduces the business’s profit and equity.
| Account | Debit | Credit |
|---|---|---|
| Rent Expense | $900 | — |
| Cash | — | $900 |
J8: The Owner Withdraws $600
On November 8, the owner transfers $600 from the business for personal use. Debit Owner Drawings and credit Cash. This withdrawal reduces equity but is not a rent, wage, or other business expense, and it does not reduce the example’s profit.
| Account | Debit | Credit |
|---|---|---|
| Owner Drawings | $600 | — |
| Cash | — | $600 |
These account names fit a sole proprietor. Corporations use accounts such as common stock, retained earnings, and dividends; see stockholders’ equity accounting for that structure. A payment for actual employee services would require its own analysis.
Posting the Entries to T-Accounts
The journal groups information by transaction. Posting transfers each line into the ledger, which groups information by account, preserving its debit or credit side. A T-account is a simplified left/right representation of a ledger account, useful for learning rather than a required business record format.[4]
The following tables post all eight entries above, with no new transactions. Debit entries appear on the left and credit entries on the right. J references identify the source entry; amounts paired across a row need not belong to the same transaction. Ending balances are the difference between the two sides, not additional postings.
Asset T-Accounts
| Debit — left | Credit — right |
|---|---|
| J1: $12,000 | J3: $1,500 |
| J2: $5,000 | J7: $900 |
| J4: $2,000 | J8: $600 |
| J6: $1,800 | — |
| Ending debit balance: $17,800 | — |
Cash debits total $12,000 + $5,000 + $2,000 + $1,800 = $20,800. Cash credits total $1,500 + $900 + $600 = $3,000. The ending balance is $20,800 − $3,000 = $17,800 debit.
| Debit — left | Credit — right |
|---|---|
| J5: $3,000 | J6: $1,800 |
| Ending debit balance: $1,200 | — |
The receivable’s $3,000 − $1,800 = $1,200 debit balance tracks the unpaid portion of the invoice. J6 appears on opposite sides in Cash and Accounts Receivable because it increases one asset and decreases another.
| Debit — left | Credit — right |
|---|---|
| J3: $4,000 | — |
| Ending debit balance: $4,000 | — |
Liability and Owner Capital T-Accounts
The unpaid equipment amount, loan principal, and owner’s contribution remain in separate accounts. No supplier payment, loan repayment, or further contribution occurs in J1–J8.
| Debit — left | Credit — right |
|---|---|
| — | J3: $2,500 |
| — | Ending credit balance: $2,500 |
| Debit — left | Credit — right |
|---|---|
| — | J2: $5,000 |
| — | Ending credit balance: $5,000 |
| Debit — left | Credit — right |
|---|---|
| — | J1: $12,000 |
| — | Ending credit balance: $12,000 |
The two liabilities total $2,500 + $5,000 = $7,500. Owner Capital still shows the $12,000 contribution because revenue, expenses, and drawings remain in their own accounts at this stage.
Revenue, Expense, and Drawings T-Accounts
Keep earned revenue, the rental cost, and the owner’s withdrawal distinct as you post. Only the first two enter the example’s profit calculation.
| Debit — left | Credit — right |
|---|---|
| — | J4: $2,000 |
| — | J5: $3,000 |
| — | Ending credit balance: $5,000 |
| Debit — left | Credit — right |
|---|---|
| J7: $900 | — |
| Ending debit balance: $900 | — |
| Debit — left | Credit — right |
|---|---|
| J8: $600 | — |
| Ending debit balance: $600 | — |
Revenue totals $2,000 + $3,000 = $5,000. Subtracting $900 rent gives $5,000 − $900 = $4,100 profit before the excluded adjustments. The $600 drawing reduces the owner’s interest without changing this profit.
Check the Trial Balance and Accounting Equation
Next, copy each account’s ending balance into a trial balance, using the debit column for a debit balance and the credit column for a credit balance. This is an unadjusted trial balance for Lakeview after J8 on November 8.[5]
| Account | Debit balance | Credit balance |
|---|---|---|
| Cash | $17,800 | — |
| Accounts Receivable | $1,200 | — |
| Equipment | $4,000 | — |
| Accounts Payable | — | $2,500 |
| Notes Payable | — | $5,000 |
| Owner Capital | — | $12,000 |
| Owner Drawings | $600 | — |
| Service Revenue | — | $5,000 |
| Rent Expense | $900 | — |
| Total | $24,500 | $24,500 |
Debits total $17,800 + $1,200 + $4,000 + $600 + $900 = $24,500. Credits total $2,500 + $5,000 + $12,000 + $5,000 = $24,500. These totals use ending balances, rather than adding every debit and credit posted during the eight transactions.
Now check the economic relationship separately. Assets are $17,800 cash + $1,200 receivables + $4,000 equipment = $23,000. Equity, including the still-separate revenue, expense, and drawings balances, is $12,000 + $5,000 − $900 − $600 = $15,500.
The $24,500 trial-balance total is not total assets or profit: it includes expense and drawings debit balances. Likewise, $17,800 cash is not the $4,100 profit. Contributions, borrowing, equipment payments, and collection timing also affected cash. The statement of cash flows preparation guide explains how cash movements are reported.
Double-Entry vs. Single-Entry Accounting
Single-Entry Records
- May use simple income, expense, and cash summaries.
- Do not require each event to have matching debit and credit entries.
- Need additional records to track items such as unpaid customer and supplier balances.
Double-Entry Records
- Record linked effects in ledger accounts.
- Distinguish assets, liabilities, equity, revenue, and expenses.
- Provide an equality check through debit and credit totals.
The IRS describes both systems and notes the built-in checks of double-entry bookkeeping.[1] The distinction concerns record structure. Cash vs. accrual accounting concerns recognition timing; it is a different question. Using double-entry does not by itself decide when revenue or expenses belong in the records.
Common Double-Entry Accounting Mistakes
- Reading debit as “decrease.” A debit increases Cash but decreases Notes Payable. Identify the account type first.
- Recording every cash receipt as revenue. Lakeview’s owner contribution and loan are separate from its service sales.
- Recognizing the same credit sale again on collection. J6 credits Accounts Receivable, not Service Revenue.
- Calling an owner drawing an expense. J8 reduces equity without reducing the example’s profit.
- Recording only the paid portion of equipment. J3 includes the $2,500 supplier balance as well as the $1,500 cash payment.
- Moving an entry to the other side when posting. A journal debit remains a debit in its ledger account.
- Adding an unexplained amount to make totals agree. Trace the journal, ledger, and underlying document to find the actual error.
Why Balanced Entries Can Still Be Wrong
Equal totals establish arithmetic balance, not correct accounting.[5] Consider separate mistakes in Lakeview’s records:
- Wrong account: Crediting Service Revenue instead of Notes Payable for the $5,000 loan would balance, while overstating revenue and understating debt by $5,000.
- Omission: Leaving out both sides of J7 would preserve equality while omitting $900 rent expense and overstating cash.
- Duplicate entry: Posting J4 twice would still balance while overstating Cash and Service Revenue by $2,000 each.
- Wrong amount: Recording J5 as $300 on both sides would balance while understating receivables and revenue by $3,000 − $300 = $2,700.
- Wrong period: A correctly balanced entry can still belong in a different reporting period.
Compare records with invoices, receipts, contracts, and bank information. Reconcile balances and check dates and account classifications; do not stop at equal columns.
Limitations of This Double-Entry Example
Double-entry specifies how linked amounts balance. It cannot establish on its own that revenue was earned, an asset is recoverable, a liability is complete, or an estimate is reasonable.
The example deliberately stops before adjustments and closing. Depreciation, accrued interest, credit losses, and other required entries could change its reported results. Its $4,100 profit figure is therefore a teaching subtotal before those excluded adjustments, not Lakeview’s finalized income for a reporting period.
More complex transactions still use debits and credits but require additional recognition and measurement rules. For example, bond accounting and amortization distinguishes debt carrying amounts from associated interest expense. Financial-statement notes help readers understand the relevant policies and estimates.[6]
The basic posting mechanics also apply under IFRS, while particular recognition and measurement rules can differ. This U.S.-oriented foundation is not a complete U.S. GAAP/IFRS comparison, tax-method selection guide, or bookkeeping-software tutorial.
Frequently Asked Questions
Sources
Sources accessed November 4, 2026. Lakeview Design and every business amount in this article are hypothetical. OpenStax is an educational textbook source; the IRS and SEC links provide government educational guidance.
- IRS, Publication 583: Starting a Business and Keeping Records, December 2024 revision, Recordkeeping: Bookkeeping System, Single-entry, Double-entry, and Reconciling the checking account.
- OpenStax, Principles of Accounting, Volume 1: Financial Accounting, section 3.1, The Accounting Equation, Double-Entry Bookkeeping, Debits and Credits, and Normal Balance of an Account. Book published April 11, 2019.
- OpenStax, Principles of Financial Accounting, section 3.2, Expanded Accounting Equation and Equity and the Expanded Accounting Equation. Book published April 11, 2019.
- OpenStax, Principles of Financial Accounting, section 3.5, Formatting When Recording Journal Entries, The General Ledger, and Posting to the T-Accounts. Book published April 11, 2019.
- OpenStax, Principles of Financial Accounting, section 3.6: Prepare a Trial Balance, ending balances, equality checks, and Locating Errors. Book published April 11, 2019.
- SEC, Beginners’ Guide to Financial Statement, Balance Sheets, Income Statements, Cash Flow Statements, and Read the Footnotes. Displayed date February 4, 2007.
Disclaimer
This article is for educational purposes and does not constitute accounting, tax, or investment advice. The hypothetical example simplifies business records and excludes period-end adjustments. Consult applicable accounting guidance and a qualified professional for a specific business or reporting decision.
Keep reading
More in Accounting
-
GAAP Conceptual Framework for Financial Reporting
The GAAP conceptual framework is the foundation of U.S. financial reporting. Learn about qualitative characteristics, recognition criteria, measurement bases…
-
Income Statement & Comprehensive Income: Structure, Components & Reporting
A complete guide to the income statement and comprehensive income under U.S. GAAP — income statement structure, OCI components, discontinued operations…
-
Statement of Cash Flows: Direct Method, Indirect Method & Preparation
Learn the statement of cash flows indirect method and direct method with a complete worked example. Covers operating, investing, and financing activities…
