Journal entries in accounting are the individual records you make for every business transaction, each one showing the date, the accounts affected, and the dollar amounts moving in and out. They are the raw material of your books: every financial statement you ever produce traces back to them. Federal tax law also requires every taxpayer to keep records sufficient to support what appears on a return, so accurate entries are a legal obligation, not just a bookkeeping preference.1Office of the Law Revision Counsel. 26 USC 6001 – Notice or Regulations Requiring Records, Statements, and Special Returns
The Five Things Every Entry Needs
A usable journal entry contains five pieces of information:
- The date the transaction actually happened, not the day you recorded it.
- The account names affected, such as Cash, Accounts Receivable, or Rent Expense.
- The debit amount, entered on the left side of the ledger.
- The credit amount, entered on the right side.
- A short description of what the transaction was and why it happened.
The description line is easy to skip when you’re moving fast. Skip it anyway and, months later, you or an auditor will be staring at $3,200 that moved between two accounts on a Tuesday in March with no idea why. Write the sentence.
The Rule That Governs Every Entry
Everything sits on one equation: Assets = Liabilities + Equity. Every transaction touches at least two accounts and keeps that equation balanced. Buy $500 of office supplies with cash and your Supplies account goes up by $500 while your Cash account goes down by $500. Nothing was created or destroyed; value moved from one bucket to another.
The mechanics: increases in asset and expense accounts are recorded as debits, and increases in liability, equity, and revenue accounts are recorded as credits. Decreases work in reverse. Total debits in an entry must equal total credits. When they don’t match, you have an error, and the mismatch itself is how you know.
This self-checking behavior is why double-entry bookkeeping has survived for more than 500 years. A single-entry system (essentially a checkbook register) can’t detect its own mistakes. Double-entry can.
A Worked Example
Say your business borrows $5,000 from a bank on June 1. Cash increases, so you debit it. Your obligation to repay also increases, so you credit the liability. The entry reads:
- Date: June 1
- Debit: Cash — $5,000
- Credit: Notes Payable — $5,000
- Description: Bank loan proceeds, 12-month term note
Both sides equal $5,000. The balance sheet stays in equilibrium because assets went up by exactly the same amount as liabilities. Every entry you’ll ever write follows this same pattern, whether it records a sale, a payroll run, or a bad debt write-off.
Types of Entries You’ll Encounter
Not every entry records a sale or a bill payment. A working set of books contains several different kinds of entries, each with its own purpose.
Standard Transaction Entries
These cover the day-to-day activity of running a business: recording sales, paying rent, buying inventory, receiving customer payments. They happen continuously and make up the bulk of the journal.
Adjusting Entries
Adjusting entries appear at the end of an accounting period to capture things that happened gradually rather than in one clean transaction. Common examples include accrued wages that employees earned but haven’t been paid, prepaid expenses like six months of insurance you paid upfront and need to recognize one month at a time, depreciation on equipment, and unearned revenue where a customer paid in advance for work you haven’t finished. These entries are essential under accrual accounting because they match expenses to the period when they actually occurred.
Closing and Reversing Entries
Closing entries zero out temporary accounts (revenue, expenses, dividends) at period end and roll their net balance into retained earnings, resetting those accounts so next period’s activity starts clean. Reversing entries, made at the start of the new period, undo specific adjusting entries so that when the real transaction eventually posts, the bookkeeping stays simple. Only some adjusting entries get reversed, and only when doing so makes the follow-up cleaner.
How to Prepare a Journal Entry
Every entry should trace back to a piece of evidence. Before you record anything, pull the source document: an invoice, receipt, bank statement, contract, or payroll report. That document tells you what happened, when it happened, and for how much. Entries without a source document become the problem entries during an audit, because the IRS can disallow deductions when a taxpayer lacks adequate records to substantiate the claimed expense.
With the source document in hand, work through four steps:
- Identify the accounts the transaction touches. A credit card purchase of equipment hits both an asset account (Equipment) and a liability account (Credit Card Payable).
- Decide which account is debited and which is credited based on whether it’s going up or down. Assets and expenses increase with debits; liabilities, equity, and revenue increase with credits.
- Confirm the totals balance. Debits must equal credits before the entry is recorded.
- Write the description in enough detail that someone unfamiliar with the transaction can understand it six months later.
Publicly traded companies operate under an added layer. The Sarbanes-Oxley Act requires management to maintain internal controls over financial reporting, which includes controls around how entries are prepared and approved.2U.S. Securities and Exchange Commission. SEC Proposes Additional Disclosures, Prohibitions to Implement Sarbanes-Oxley Act In practice, that means different people handle preparing, recording, and reviewing entries. Private businesses aren’t legally required to separate those duties, but doing so is still a sensible guard against both errors and fraud.
Fixing an Entry That’s Wrong
Errors happen. You post an expense to the wrong account, transpose two digits, or forget an entry entirely. Never erase or delete the original. Doing so destroys the audit trail and can look like concealment. Record a correcting entry instead: a new entry that reverses the incorrect one and, if needed, records the transaction the right way.
If you accidentally debited Telephone Expense instead of Utilities Expense for $200, the correcting entry credits Telephone Expense for $200 to undo the mistake and debits Utilities Expense for $200 to record it properly. The original wrong entry stays in the journal with a note pointing to the correction. The full history stays intact, including the error and how you resolved it.
If you catch the mistake before it’s posted to the ledger, some systems let you line through the incorrect item and initial the change. Once an entry has been posted, though, a formal correcting entry is the only proper fix.
How Long to Keep the Records
The IRS doesn’t set a single blanket retention period for accounting records. You keep records for as long as the period of limitations on the return they support remains open. For most businesses that means at least three years from the date the return was filed. If you underreport income by more than 25% of gross income, the window extends to six years. If you claim a loss from worthless securities or a bad debt deduction, keep those records for seven years. If you never filed a return, or filed a fraudulent one, there’s no expiration and you keep the records indefinitely.3Internal Revenue Service. How Long Should I Keep Records
Payroll records carry separate rules. Employment tax records must be kept for at least four years after the tax becomes due or is paid, whichever is later.3Internal Revenue Service. How Long Should I Keep Records Under federal labor regulations, basic payroll records must be preserved for at least three years, and supplementary records like time cards and wage rate tables for at least two.4eCFR. Records to Be Kept by Employers
The safe default is to keep your general ledger and journals for at least seven years. That covers the longest common IRS limitation period for most situations and satisfies most state requirements as well.
What Inaccurate or False Entries Can Cost
Sloppy bookkeeping and intentional fraud sit at opposite ends of a serious spectrum. Neither ends well.
On the civil side, the IRS imposes an accuracy-related penalty equal to 20% of any tax underpayment caused by negligence or substantial understatement of income. That rate doubles to 40% for gross valuation misstatements or undisclosed foreign financial asset understatements.5Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments Poor entries don’t trigger these penalties directly, but they make it far easier to underreport income or overstate deductions, which does.
Criminal penalties are reserved for intentional misconduct. Willfully preparing or helping prepare a fraudulent return carries a fine of up to $100,000 for individuals ($500,000 for corporations) and up to three years in prison.6Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements Making false entries in records to obstruct a federal investigation can result in up to 20 years in prison.7Office of the Law Revision Counsel. 18 USC 1519 – Destruction, Alteration, or Falsification of Records in Federal Investigations Officers of public companies who willfully certify false financial reports face fines up to $5,000,000 and up to 20 years in prison under the Sarbanes-Oxley criminal provisions.8Office of the Law Revision Counsel. 18 USC 1350 – Failure of Corporate Officers to Certify Financial Reports
The practical point stands. When every transaction is recorded correctly, backed by a source document, and posted to the right accounts, an audit becomes routine paperwork instead of a crisis.