Allowable expenses are expenses that satisfy the deductibility requirements under tax law, particularly the principle that the expense must be wholly and exclusively incurred in the production of gross income under Section 33(1) of the Income Tax Act 1967 (Malaysia, 1967).

This means the expense must serve a genuine business purpose and have a direct connection to income-generating activities.

To qualify as a deduction, expenses are generally expected to be:

• directly related to business operations

• supported by proper documentation

• incurred during the relevant basis period

• genuinely incurred for business purposes

Common examples of allowable expenses include:

• staff salaries

• rental expenses

• utilities

• routine business operating costs

• professional fees directly related to business activities

From an audit perspective, allowable expenses are still subject to verification. LHDN will assess whether the expense is genuinely business-related, properly supported, and correctly classified before accepting it as a deduction (Inland Revenue Board of Malaysia, 2019).

Non-allowable expenses are expenses that are specifically disallowed under tax law, regardless of whether they are incurred for business purposes.

These typically include:

• personal or private expenses

• fines and penalties

• capital expenditure

• certain types of entertainment expenses

• provisions that do not meet deductibility requirements

• expenses not wholly and exclusively incurred in the production of income

Under Section 39 of the Income Tax Act 1967, certain expenses are expressly prohibited as tax deductions (Malaysia, 1967).

Examples include:

• Section 39(1)(a): private or domestic expenses

• Section 39(1)(b): expenses not wholly and exclusively incurred in producing gross income

During a tax audit, these expenses are commonly identified and added back to taxable income.

From an audit perspective, failure to properly identify and exclude non-allowable expenses is one of the main causes of tax adjustments and additional assessments (Inland Revenue Board of Malaysia, 2019).

In practice, tax treatment is reflected through adjustments made to accounting profit in order to arrive at chargeable income.

Expenses that are not allowable, or only partially allowable, must be added back in the tax computation.

Common add-back items include:

• non-deductible expenses

• disallowed portions of expenses

• accounting depreciation (replaced by capital allowance)

• general provisions that are not tax deductible

• private or non-business expenses

From an audit perspective, LHDN will closely review the tax computation to ensure all necessary adjustments have been properly made.

Failure to perform accurate add-backs may result in underreported income, additional tax liabilities, and penalties (Malaysia, 1967; Inland Revenue Board of Malaysia, 2019).

A key aspect of tax treatment involves distinguishing between immediate expense deductions and capital allowance treatment.

Capital expenditure is generally not deductible as a business expense. Instead, it may qualify for capital allowance treatment, which allows deductions over time based on prescribed rates under tax legislation (Malaysia, 1967).

This commonly includes:

• machinery and equipment

• office assets

• renovation or improvement costs (depending on nature)

• computer hardware and business-use assets

Misclassification between revenue expenditure and capital expenditure is a common audit issue, as it directly affects the timing of tax deductions.

From an audit perspective, LHDN will review whether capital items have been incorrectly expensed to reduce current taxable income (Inland Revenue Board of Malaysia, 2019; Noraza Mat Udin, 2022).

Example: A company records renovation costs as repairs and maintenance expenses to obtain an immediate tax deduction instead of applying capital allowance treatment.