Illinois Revenue Auditor Exam (IDOR) –
Certification Newest 2026- 2027
Updated Practice Exam | 100 Actual
Most Tested Questions Collections &
Verified Detailed Answers | Tutor
Verified Success Exam) Graded A+
1.
An auditor is reviewing a business’s sales tax filings and notices consistent
underreporting of taxable sales compared to bank deposits. What is the most
appropriate initial audit step?
A. Immediately assess penalties
B. Expand the audit to include expense testing
C. Reconcile bank deposits to reported sales
D. Close the audit due to insufficient evidence
✓
Answer: C. Reconcile bank deposits to reported sales
Rationale: The first audit step is to perform a basic reconciliation to confirm
whether discrepancies exist between reported revenue and bank deposits,
establishing factual accuracy before deeper procedures.
2.
,Which of the following best describes “nexus” in state taxation?
A. The taxpayer’s accounting method
B. The legal connection between a business and a taxing state
C. The total amount of taxable income
D. A federal tax exemption status
✓
Answer: B. The legal connection between a business and a taxing state
Rationale: Nexus determines whether a business has sufficient presence or activity
in a state to justify taxation.
3.
Which audit technique is most effective for detecting unreported cash sales?
A. Ratio analysis of liabilities
B. Bank deposit analysis
C. Fixed asset verification
D. Depreciation recalculation
✓
Answer: B. Bank deposit analysis
Rationale: Bank deposit analysis helps identify cash inflows that may not be
recorded in sales records.
4.
A taxpayer consistently reports lower gross receipts than industry averages. What
is the best auditor response?
A. Assume compliance
B. Conduct a comparative ratio analysis
C. Immediately impose fraud penalties
D. Ignore industry benchmarks
✓
,Answer: B. Conduct a comparative ratio analysis
Rationale: Comparative ratio analysis helps identify anomalies by benchmarking
against industry standards.
5.
Which document is most important for verifying payroll tax compliance?
A. Trial balance
B. Bank reconciliation statement
C. Payroll registers and IRS Forms W-2/W-3
D. Purchase invoices
✓
Answer: C. Payroll registers and IRS Forms W-2/W-3
Rationale: Payroll records and tax forms are primary evidence for verifying wage
reporting accuracy.
6.
What is the primary purpose of audit sampling?
A. Eliminate the need for testing
B. Estimate conclusions about a population
C. Replace financial statements
D. Increase tax liability
✓
Answer: B. Estimate conclusions about a population
Rationale: Sampling allows auditors to draw conclusions about a large dataset
using representative items.
7.
, Which situation most strongly indicates potential tax fraud?
A. Minor calculation errors
B. Consistent rounding differences
C. Large unexplained discrepancies in reported income
D. Late filing of returns only
✓
Answer: C. Large unexplained discrepancies in reported income
Rationale: Significant unexplained variances may indicate intentional financial
misstatement or fraud.
8.
Which financial statement is most useful for identifying revenue manipulation?
A. Balance sheet
B. Income statement
C. Statement of retained earnings
D. Statement of stockholders’ equity
✓
Answer: B. Income statement
Rationale: The income statement directly reflects revenue and expenses, making
it key for detecting manipulation.
9.
An auditor finds that sales tax collected exceeds sales tax remitted. What is the
most likely issue?
A. Overpayment to the state
B. Underreporting or non-remittance of tax
C. Correct compliance
D. Excess inventory
✓
Certification Newest 2026- 2027
Updated Practice Exam | 100 Actual
Most Tested Questions Collections &
Verified Detailed Answers | Tutor
Verified Success Exam) Graded A+
1.
An auditor is reviewing a business’s sales tax filings and notices consistent
underreporting of taxable sales compared to bank deposits. What is the most
appropriate initial audit step?
A. Immediately assess penalties
B. Expand the audit to include expense testing
C. Reconcile bank deposits to reported sales
D. Close the audit due to insufficient evidence
✓
Answer: C. Reconcile bank deposits to reported sales
Rationale: The first audit step is to perform a basic reconciliation to confirm
whether discrepancies exist between reported revenue and bank deposits,
establishing factual accuracy before deeper procedures.
2.
,Which of the following best describes “nexus” in state taxation?
A. The taxpayer’s accounting method
B. The legal connection between a business and a taxing state
C. The total amount of taxable income
D. A federal tax exemption status
✓
Answer: B. The legal connection between a business and a taxing state
Rationale: Nexus determines whether a business has sufficient presence or activity
in a state to justify taxation.
3.
Which audit technique is most effective for detecting unreported cash sales?
A. Ratio analysis of liabilities
B. Bank deposit analysis
C. Fixed asset verification
D. Depreciation recalculation
✓
Answer: B. Bank deposit analysis
Rationale: Bank deposit analysis helps identify cash inflows that may not be
recorded in sales records.
4.
A taxpayer consistently reports lower gross receipts than industry averages. What
is the best auditor response?
A. Assume compliance
B. Conduct a comparative ratio analysis
C. Immediately impose fraud penalties
D. Ignore industry benchmarks
✓
,Answer: B. Conduct a comparative ratio analysis
Rationale: Comparative ratio analysis helps identify anomalies by benchmarking
against industry standards.
5.
Which document is most important for verifying payroll tax compliance?
A. Trial balance
B. Bank reconciliation statement
C. Payroll registers and IRS Forms W-2/W-3
D. Purchase invoices
✓
Answer: C. Payroll registers and IRS Forms W-2/W-3
Rationale: Payroll records and tax forms are primary evidence for verifying wage
reporting accuracy.
6.
What is the primary purpose of audit sampling?
A. Eliminate the need for testing
B. Estimate conclusions about a population
C. Replace financial statements
D. Increase tax liability
✓
Answer: B. Estimate conclusions about a population
Rationale: Sampling allows auditors to draw conclusions about a large dataset
using representative items.
7.
, Which situation most strongly indicates potential tax fraud?
A. Minor calculation errors
B. Consistent rounding differences
C. Large unexplained discrepancies in reported income
D. Late filing of returns only
✓
Answer: C. Large unexplained discrepancies in reported income
Rationale: Significant unexplained variances may indicate intentional financial
misstatement or fraud.
8.
Which financial statement is most useful for identifying revenue manipulation?
A. Balance sheet
B. Income statement
C. Statement of retained earnings
D. Statement of stockholders’ equity
✓
Answer: B. Income statement
Rationale: The income statement directly reflects revenue and expenses, making
it key for detecting manipulation.
9.
An auditor finds that sales tax collected exceeds sales tax remitted. What is the
most likely issue?
A. Overpayment to the state
B. Underreporting or non-remittance of tax
C. Correct compliance
D. Excess inventory
✓
