Why Controls Matter in Financial Reporting
A transaction can be authorized but recorded incorrectly; an accurate journal entry can be posted to the wrong account; and a correct adjusted trial balance can be mapped incorrectly into a statement. Internal controls are the procedures and responsibilities designed to reduce these risks and provide evidence that the reporting process is working as intended.
Controls do not guarantee that every error or fraud will be prevented. They are designed to reduce risk to a reasonable level, and their effectiveness depends on consistent performance, appropriate evidence, and follow-up when exceptions arise. A control that exists only as a written policy, but is not actually performed, does not provide the intended protection.
Controls should be considered throughout the reporting cycle: when transactions are authorized and recorded, when period-end adjustments are prepared and posted, and when account balances are assembled into financial statements. The earlier material on the adjustment workpaper, adjusted trial balance, and statement construction supplies the accounting records that these controls check.
Segregation of Duties and Authorization
Segregation of duties means assigning incompatible responsibilities to different people. The most important functions to separate are authorization, custody of assets, recording transactions, and independent review or reconciliation. If one person can authorize a transaction, handle the asset, record the transaction, and conceal the result, an error or misappropriation may be harder to prevent or detect.
For example, a person who receives customer checks should not also have unrestricted ability to change customer balances and reconcile the bank account. In a smaller organization, complete separation may be impractical. Compensating controls can include owner review of bank statements, approval of payments, restricted system access, or a second person's review of reconciliations.
Authorization establishes that a transaction is permitted under the organization's rules and has been approved by someone with suitable authority. Authorization can be specific, such as approval of an individual purchase order, or operate through defined limits, such as a manager's authority to approve purchases up to a stated amount. Approval should occur before the commitment or payment when practicable, and evidence should identify what was approved, by whom, and when.
Authorization alone does not establish that a transaction was recorded completely or accurately. A useful control design also checks supporting evidence, confirms that the transaction was recorded in the appropriate period and account, and restricts who can change the accounting records.
An appropriate manager approves the transaction or adjustment under documented authority limits.
The preparer uses relevant documents or schedules and records the transaction in the accounting system.
A person who did not prepare or post the item checks its support, calculation, account coding, and evidence of approval.
Differences are investigated, documented, and corrected when the evidence supports a correction.
Reconciliations: Explaining Differences, Not Just Matching Totals
A reconciliation compares two records of the same balance or activity, explains valid differences, and identifies items that require investigation or recording. For cash, the bank statement and the cash ledger may differ because a payment or deposit is recorded on different dates. Other differences, such as an unrecorded bank fee, require an accounting entry rather than simply being labelled a timing item.
For a bank reconciliation, the adjusted bank balance is the statement balance plus deposits in transit less outstanding checks. The adjusted book balance is the ledger balance plus bank credits not yet recorded in the books less bank charges or other bank debits not yet recorded. Once both sides include the relevant timing items and book adjustments, they should agree.
Why the reconciliation works: Both records concern the same cash account, but they may include valid cash movements at different points in the processing cycle. Adding deposits that have been recorded by the organization but have not yet reached the statement, and subtracting checks recorded by the organization but not yet cleared, brings the bank side up to date for those timing differences. Recording legitimate bank credits and debits missing from the ledger brings the book side up to date. If there are no unexplained items, both adjusted amounts represent the same cash balance.
Worked Example: Reviewing a Bank Reconciliation
A reviewer receives a bank statement showing a month-end balance of $18,460 and a cash ledger showing $19,270. The reconciliation lists a $2,300 deposit in transit and outstanding checks of $1,140. The bank also collected a $500 customer note on the organization's behalf, charged an $80 bank fee, and returned a $70 customer check as non-sufficient funds. Assume there are no other differences. Determine the adjusted cash balance, the required entries, and whether the reconciliation is complete.
Method. First adjust the statement for timing differences. Then adjust the ledger for bank items not yet recorded. An independent reviewer should also check the supporting statement and confirm that the listed deposit and outstanding checks are genuine, dated appropriately, and not duplicated.
Bank side: $18,460 + $2,300 = $20,760 after adding the deposit in transit. Then $20,760 − $1,140 = $19,620 after deducting outstanding checks.
Book side: Start with $19,270. Add the $500 collection: $19,270 + $500 = $19,770. Deduct the $80 fee: $19,770 − $80 = $19,690. Deduct the $70 returned check: $19,690 − $70 = $19,620.
The adjusted amounts agree at $19,620. The book entries are: debit Cash $500 and credit Notes Receivable $500 for the note collection; debit Bank Fee Expense $80 and credit Cash $80 for the fee; and debit Accounts Receivable $70 and credit Cash $70 for the returned customer check. Each entry has equal debits and credits.
Check: The net book adjustment is +$500 − $80 − $70 = +$350, and $19,270 + $350 = $19,620. The reconciliation balances on both sides. The common mistake is to add the deposit in transit and subtract outstanding checks on the book side as well. Those items already affect the ledger balance; applying them there again would double-count them.
Controls Over Period-End Adjustments
Period-end adjustments often involve calculations or information assembled outside the routine transaction system. Useful controls include a standard adjustment workpaper, identifiable supporting schedules, approval by an appropriate reviewer, restricted posting rights, and a comparison of the approved adjustment with the entry actually posted. A balanced journal entry is not, by itself, evidence that its amount is correct or that it was authorized.
A strong review checks the underlying quantities and rates, the arithmetic, the accounts and period selected, the approval evidence, and whether the posted entry matches the approved workpaper. The review should be documented, and significant differences should be resolved rather than merely noted. The preparer and poster may be the same person in some settings, but an independent review becomes especially important when duties cannot be fully separated.
Worked Example: Finding an Error in a Period-End Adjustment
A department's approved payroll schedule shows that eight technicians each worked 7.5 hours of earned but unpaid overtime at $40 per hour at period-end. The approved workpaper records an adjustment of $2,400. The journal-entry report shows that $3,400 was posted as a debit to Wage Expense and a credit to Wages Payable. Determine the supported adjustment, the error, and its financial statement effect.
Method. Recalculate the supporting schedule independently, then compare that result with both the approved workpaper and the posted entry.
The supported amount is 8 technicians × 7.5 hours each = 60 hours. At $40 per hour, 60 × $40 = $2,400. The workpaper amount is therefore supported by the stated schedule.
The posted amount exceeds the supported amount by $3,400 − $2,400 = $1,000. If the posted entry is otherwise in the stated accounts and period, Wage Expense is overstated by $1,000 and Wages Payable is overstated by $1,000. Before considering any tax effects, net income and retained earnings are each understated by $1,000 relative to the correctly recorded adjustment.
To correct the excess, debit Wages Payable $1,000 and credit Wage Expense $1,000. This reduces the liability and expense by the same amount. The correcting entry balances: debits of $1,000 equal credits of $1,000.
A suitable control is to have a reviewer recalculate the schedule and compare the approved workpaper with the journal-entry report. The common mistake is to treat the balanced $3,400 entry as evidence of accuracy. Equal debits and credits establish that the entry is arithmetically balanced, not that its amount is supported.
Controls Over Financial Statement Preparation
Financial statement preparation introduces another point at which errors can arise: balances may be omitted, duplicated, assigned to the wrong line, or displayed with the wrong sign. A controlled process uses an approved adjusted trial balance as its source, documents how accounts map to statement lines, restricts edits to the reporting file, and requires an independent tie-out from the statements back to that source.
A reviewer should not rely only on the accounting equation. A statement can balance and still be wrong if two classification errors offset. Conversely, an imbalance is an important warning that warrants investigation, but it does not identify the source by itself. Account-by-account mapping, comparison with the adjusted trial balance, and review of material changes provide complementary checks.
Worked Example: Detecting Statement Mapping Errors
An adjusted trial balance, in thousands of dollars, contains Cash $84, Accounts Receivable $112, Allowance for Uncollectible Accounts with a credit balance of $7, Inventory $96, Property and Equipment, net, $218, Accounts Payable $73, Wages Payable $12, Debt $140, Common Stock $180, and Retained Earnings $98. A draft balance sheet shows Accounts Receivable of $119, omits Wages Payable, and reports the other listed amounts correctly. Identify the mapping errors and calculate the corrected totals.
Method. Map each account to its statement line, preserve the allowance's contra-asset effect, include every liability, and then independently check that total assets equal total liabilities plus equity.
Net Accounts Receivable is $112 − $7 = $105. The draft's $119 equals $112 + $7, so the allowance has been added instead of deducted; assets are overstated by $14. The omitted Wages Payable understates liabilities by $12.
Correct total assets are $84 + $105 + $96 + $218 = $503 thousand. Correct total liabilities are $73 + $12 + $140 = $225 thousand. Correct total equity is $180 + $98 = $278 thousand. Liabilities plus equity are $225 + $278 = $503 thousand, equal to total assets.
The draft reports assets of $84 + $119 + $96 + $218 = $517 thousand and liabilities of $73 + $140 = $213 thousand. With equity of $278 thousand, its right-hand total is $213 + $278 = $491 thousand, leaving an imbalance of $517 − $491 = $26 thousand. This difference is consistent with the two errors: the $14 asset overstatement plus the $12 liability understatement equals $26.
The corrected balance sheet checks: $503 thousand of assets equals $225 thousand of liabilities plus $278 thousand of equity. The common mistake is to treat a balancing check as a substitute for account-level review. Here it flags a problem, but the mapping back to the adjusted trial balance is what identifies both errors.
What Makes a Review Control Useful?
A review control is more than a signature or a general instruction to “check the work.” It should be specific enough that another person can determine what was reviewed and what happened when an exception appeared. Useful evidence can include an electronic approval record, a dated reconciliation with supporting documents, a reviewer's recorded recalculation, or a documented resolution of an identified difference.
| Control activity | Primary purpose | Evidence to retain |
|---|---|---|
| Approval before a purchase or payment | Prevent unauthorized commitments or disbursements | Approver, date, amount, and supporting request |
| Independent bank reconciliation | Detect missing, duplicated, or incorrectly recorded cash activity | Statement, reconciliation, and investigation of exceptions |
| Review of an adjustment workpaper | Detect unsupported calculations, coding errors, or incorrect amounts | Source schedule, approval, and comparison with the posted entry |
| Statement-to-trial-balance tie-out | Detect omissions, duplicated mappings, and sign errors | Mapping schedule and reviewer sign-off with resolved differences |
Controls have limitations. Two employees may collude, a reviewer may fail to challenge an assumption, or a person with system access may override a procedure. Controls also involve cost, so their design should focus on risks that could materially affect the records or statements. A reconciliation that finds an exception is useful only if someone investigates it and the conclusion is documented.
- Do not confuse authorization with accuracy. Approval confirms permission, not correct coding or calculation.
- Do not confuse a balanced entry with a supported entry. Debits equal credits even when both are based on a wrong amount.
- Do not treat timing differences as missing book entries. Deposits in transit and outstanding checks usually adjust the bank side; unrecorded bank items usually require book entries.
- Do not assume a balancing statement is complete. An omitted amount can be offset by another error.
- Do not treat a sign-off as proof of an effective review. The review should leave evidence of what was checked and how exceptions were resolved.
Check Your Understanding
For each problem, identify the control issue and complete the requested calculation or recommendation.
- A staff member receives customer checks, records the receipts, and prepares the bank reconciliation. State the main segregation-of-duties risk and name one practical independent control that could reduce it. (Answer: The same person can misappropriate or misrecord receipts and conceal the difference in the reconciliation; an independent reviewer should compare the bank statement, deposit support, and cash ledger and document the review.)
- A bank statement balance is $31,820. Deposits in transit are $1,400 and outstanding checks are $2,100. The cash ledger is $30,950 and omits bank interest of $300, a bank fee of $90, and a returned customer check of $40. Calculate the adjusted balance and state the required book entries. (Answer: Adjusted bank balance = $31,820 + $1,400 − $2,100 = $31,120; adjusted book balance = $30,950 + $300 − $90 − $40 = $31,120; debit Cash $300 and credit interest revenue $300, debit bank fee expense $90 and credit Cash $90, and debit Accounts Receivable $40 and credit Cash $40.)
- A workpaper supports an accrued service cost of 9 workers × 7 hours × $28 per hour. The posted debit to expense and credit to payable are each $2,164. Calculate the supported amount, the excess, and the direction of the errors. (Answer: Supported amount = 9 × 7 × $28 = $1,764; the accrual is overstated by $400, so expense and the payable are each overstated by $400 and, before tax effects, net income is understated by $400.)
- An adjusted trial balance reports inventory of $64,000, accounts payable of $38,000, wages payable of $6,000, debt of $50,000, common stock of $40,000, and retained earnings of $22,000. A draft statement includes all these balances except wages payable. What total liabilities and equity should the statement report, and what does the omission do to the balance-sheet check? (Answer: Liabilities are $38,000 + $6,000 + $50,000 = $94,000; equity is $40,000 + $22,000 = $62,000; liabilities and equity total $156,000. Omitting wages payable understates liabilities and liabilities plus equity by $6,000, so the statement will not balance if the other balances are correct.)
- A reviewer finds that an adjustment was approved and that its journal entry balances, but the supporting schedule was not retained. Explain why these facts are insufficient and name two pieces of evidence the control process should retain. (Answer: Approval and equal debits and credits do not demonstrate that the amount was calculated correctly or supported; retain the source schedule and documented independent review, including the reviewer's approval or recorded resolution of exceptions.)