Audit Techniques

How Does LHDN Audit Expense Transactions?

INTRODUCTION

During a tax audit, LHDN does not rely on assumptions or general explanations provided by the taxpayer. Instead, auditors apply structured audit techniques to verify whether expenses claimed are valid, accurately recorded, and compliant with tax legislation.

These techniques are designed to gather sufficient evidence to assess the occurrence, accuracy, completeness, classification, and deductibility of expense transactions (Inland Revenue Board of Malaysia, 2019; Messier, Glover, & Prawitt, 2017).

Understanding how these audit techniques work provides valuable insight into how LHDN evaluates expenses in practice and how potential issues are identified during an audit.

⚠️Common Audit Red Flags in Expenses Transactions

During a tax audit, auditors often identify unusual patterns or inconsistencies that may indicate potential misstatement, unsupported claims, or incorrect tax treatment.

Common red flags include:

sudden increase in consultancy or management fees
repetitive round-figure payments
missing supporting invoices or agreements
excessive director-related expenses
duplicate supplier invoices
unusually high expenses compared to revenue trends
related-party transactions without commercial justification
payroll expenses inconsistent with EPF/SOCSO records

These indicators do not automatically mean fraud or non-compliance. However, they often trigger further audit procedures and document verification (Inland Revenue Board of Malaysia, 2019; Messier, Glover, & Prawitt, 2017).

AUDIT TECHNIQUES USED BY LHDN

STEP 1 : ANALYTICAL PROCEDURES

Analytical procedures involve evaluating financial data by identifying patterns, relationships, and fluctuations.

During a tax audit, LHDN may compare:

current year vs prior year expenses
expense ratios against revenue
industry benchmarks
specific expense trends (e.g. consultancy, management fees, repairs)

Significant or unusual fluctuations are treated as risk indicators and will trigger further investigation.

From an audit perspective, analytical procedures are often used as a starting point to identify high-risk areas before performing detailed testing (Messier, Glover, & Prawitt, 2017; Inland Revenue Board of Malaysia, 2019).

Example:
A sudden increase in consultancy fees without a corresponding change in business activity may prompt further verification of those expenses.

STEP 2 : INQUIRY & OBSERVATION

Inquiry involves obtaining explanations from management and staff regarding specific transactions, unusual items, or accounting treatments.

Observation involves reviewing supporting evidence such as contracts, internal documents, and even physical inspection of business operations where necessary.

This technique helps auditors assess:

the business purpose of expenses
the reasonableness of transactions
consistency between explanation and documentation

Inconsistent or unclear explanations may increase audit risk and lead to further investigation (Messier, Glover, & Prawitt, 2017; Inland Revenue Board of Malaysia, 2019).

Example:
Management claims certain expenses are for business promotion, but cannot clearly explain the nature or provide supporting evidence.

STEP 3 : VOUCHING

Vouching is one of the most fundamental audit techniques used to verify the validity and occurrence of expense transactions.

This process involves selecting entries from the accounting records and tracing them back to supporting documents such as supplier invoices, payment vouchers, bank statements, purchase orders, and service agreements.

From an audit perspective, vouching is used to confirm that:

the expense actually occurred
the amount recorded is accurate
the transaction is supported by valid documentation
the expense relates to genuine business activities

Where supporting documents are incomplete, inconsistent, or missing, the expense may be challenged or disallowed (Messier, Glover, & Prawitt, 2017; Inland Revenue Board of Malaysia, 2019).

Example:
An auditor selects a consultancy fee recorded in the accounts and requests the invoice, contract, and proof of payment. If these cannot be provided, the expense may be disallowed.

STEP 4 : TRACING & CUT OFF TESTING

Tracing is used to assess the completeness of expense transactions by working in the opposite direction of vouching. Instead of starting from the accounting records, auditors begin with source documents such as bank statements, supplier statements, invoices, or payment records and trace them forward into the accounting system.

This procedure helps auditors determine whether all relevant transactions have been properly recorded and accurately reflected in the financial records.

Tracing is commonly used to identify:

unrecorded expenses
incorrect postings or classifications
transactions omitted from the accounting records
inconsistencies between payment records and reported expenses

In addition to tracing, auditors may also perform cut-off testing to ensure expenses are recorded in the correct accounting period. This is particularly important for year-end transactions, accruals, and prepaid expenses, where incorrect timing may lead to misstatement of taxable income.

From an audit perspective, tracing and cut-off testing are useful in detecting hidden, omitted, or misclassified transactions that may not be immediately visible in the financial statements (Messier, Glover, & Prawitt, 2017; Inland Revenue Board of Malaysia, 2019).

Example:
An auditor reviews bank payment records and identifies a supplier payment that was either not recorded in the accounting system or incorrectly classified under another expense category. The auditor may also identify an invoice dated in January that was incorrectly recorded as a December expense to reduce taxable income for the current year.

STEP 5 : RECALCULATION & REPERFOMANCE

Recalculation involves independently verifying the mathematical accuracy of expense-related computations.

Reperformance goes a step further, where the auditor independently re-executes processes performed by the taxpayer to confirm their accuracy.

This technique is commonly applied to:

expense totals and aggregations
apportionment of expenses
tax adjustments (e.g. add-backs)
capital allowance computations

Errors identified during recalculation may indicate inaccuracies in the tax computation or underlying accounting records (Messier, Glover, & Prawitt, 2017; Inland Revenue Board of Malaysia, 2019).

Example:
An auditor recalculates the allowable portion of entertainment expenses and identifies that the 50% restriction was not properly applied.

STEP 6 — SAMPLING TECHNIQUES

Sampling techniques are commonly used during a tax audit because auditors are unable to examine every expense transaction in detail. Instead, selected transactions are tested based on risk, materiality, and the nature of the expenses.

Auditors may focus on:

high-value expenses
unusual transactions
year-end adjustments
related-party payments
expenses with weak supporting documentation

The selected samples are then reviewed together with invoices, payment records, agreements, and accounting entries to verify their accuracy and tax deductibility.

From an audit perspective, sampling helps auditors identify potential misstatements and compliance issues efficiently without reviewing the entire population of transactions (Messier, Glover, & Prawitt, 2017; Inland Revenue Board of Malaysia, 2019).

Example:
An auditor selects several high-value consultancy expenses for detailed testing to determine whether the expenses are properly supported and allowable under tax legislation.

STEP 7 : THIRD PARTY CONFIRMATION & DATA CROSS-REFERENCING

LHDN increasingly relies on third-party data and cross-referencing to verify expense transactions.

Auditors may compare taxpayer records against data obtained from:

banks
EPF and SOCSO records
SSM filings
e-Invoice system
other government agencies

This allows LHDN to independently verify whether reported expenses are consistent with external data sources.

Any discrepancies identified through cross-referencing may result in adjustments or further audit procedures (Inland Revenue Board of Malaysia, 2019).

Example:
Salary expenses reported by a company do not match EPF contribution records, raising questions about accuracy or completeness.

KEY TAKEWAYS FROM TAX AUDIT PROCEDURES

These audit techniques are applied collectively to form a comprehensive assessment of expense transactions.

Rather than relying on a single method, LHDN combines multiple techniques to evaluate whether expenses are:

genuine
properly documented
correctly classified
compliant with tax legislation

For taxpayers, understanding these techniques provides a clearer perspective on how expenses are reviewed during an audit—and highlights the importance of maintaining accurate records, proper documentation, and consistent reporting practices (Inland Revenue Board of Malaysia, 2019; Messier, Glover, & Prawitt, 2017).

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