What IRAS Looks for During Corporate Tax Reviews: A Practical Guide for Singapore Businesses

09 April 2026

Editor: ET

Learn what IRAS looks for during corporate tax reviews in Singapore. Discover key compliance areas, documentation tips, and how to prepare your business effectively.

In Singapore, maintaining strong tax compliance is a fundamental part of running a successful business. The Inland Revenue Authority of Singapore (IRAS) conducts corporate tax reviews to ensure that companies are reporting their income accurately and complying with tax regulations. While the idea of a tax review may seem intimidating, it is often a routine process focused on verification rather than enforcement.

For businesses that are well-prepared, an IRAS review can be handled smoothly and efficiently. Drawing from practical insights aligned with Expede, this article explores what IRAS typically looks for during corporate tax reviews and how businesses can stay ready at all times.

Further Reading: Happy Easter 2026 in Singapore: A Fresh Start Filled with Hope and Intention

Accuracy and Consistency in Financial Reporting

One of the first things IRAS examines during a corporate tax review is the accuracy and consistency of financial information. The figures reported in tax filings—such as Estimated Chargeable Income (ECI) and Form C-S or Form C—should align with the company’s financial statements.

Any discrepancies between reported revenue, expenses, or profits may trigger further questions. IRAS pays attention to whether the numbers make sense over time, especially if there are significant fluctuations without clear explanation.

Businesses can avoid unnecessary queries by ensuring that their accounting records are properly maintained and regularly reconciled. Consistency across financial documents builds confidence and reduces the likelihood of extended reviews.

Supporting Documents for Income and Expenses

IRAS places strong emphasis on documentation. During a review, companies may be asked to provide supporting evidence for income reported and expenses claimed.

Common documents requested include:

• Sales invoices and contracts

• Purchase receipts and supplier invoices

• Bank statements

• Payroll records

• Fixed asset schedules

The key is not just having these documents, but ensuring they are organised and easily retrievable. Well-structured documentation allows businesses to respond quickly and accurately, which helps resolve queries efficiently.

Legitimacy of Expense Claims

Another important focus area is whether expenses claimed are valid and tax-deductible. In Singapore, expenses must be “wholly and exclusively incurred” for business purposes to qualify for deduction.

IRAS may review:

• Whether personal expenses have been incorrectly claimed

• Whether expenses are properly categorised

• Whether large or unusual claims are supported by clear justification

For example, entertainment expenses, travel costs, and director-related expenses often receive closer attention. Businesses should ensure that all claims are reasonable, properly documented, and aligned with tax regulations.

Revenue Recognition and Completeness

IRAS also assesses whether all income has been properly reported. This includes checking that revenue is recognised correctly and that no income has been omitted.

Areas of focus may include:

• Timing of revenue recognition

• Differences between accounting revenue and taxable income

• Unusual drops or spikes in revenue

Incomplete or inconsistent reporting can raise concerns, even if unintentional. Regular review of revenue records helps ensure that all income is accurately captured and reported.

Related Party Transactions

For companies dealing with related parties—such as subsidiaries, parent companies, or directors—IRAS may examine whether transactions are conducted at arm’s length.

This means that transactions should be priced as if they were carried out between independent parties. IRAS may review agreements, pricing structures, and supporting documentation to ensure fairness and compliance.

Businesses engaging in related party transactions should maintain clear records and, where necessary, transfer pricing documentation to support their positions.

Compliance with Filing Requirements

Timely and accurate filing is another key area IRAS looks at. This includes:

• Submission of ECI within the required timeframe

• Filing of annual corporate tax returns

• Proper reporting of financial statements

Late or incomplete filings can increase the likelihood of queries and may result in penalties. Staying organised and adhering to deadlines is essential for maintaining a strong compliance record.

GST and Other Tax Considerations

For GST-registered businesses, IRAS may also review whether GST reporting aligns with corporate tax filings. Inconsistencies between GST returns and reported revenue can trigger further investigation.

Additionally, IRAS may assess whether other tax obligations—such as withholding tax or employee-related filings—have been properly handled. A holistic approach to compliance ensures that all aspects of tax reporting are aligned.

Clear Explanations and Professional Communication

During a tax review, how a business responds is just as important as the documents it provides. IRAS values clear, concise, and professional communication.

Businesses should:

• Respond within the given timeframe

• Provide accurate and complete information

• Avoid unnecessary or unclear explanations

Being transparent and cooperative helps build trust and often leads to faster resolution of queries.

Further Reading: Peaceful Good Friday 2026 in Singapore: A Time for Reflection, Renewal, and Purposeful Business Values

Why Preparation Matters

The most important takeaway is that IRAS reviews are far less stressful when businesses are prepared. Companies that maintain clean records, understand their tax positions, and organise their documentation can handle reviews with confidence.

Preparation is not something done only when a query arises—it should be part of everyday business operations. Regular bookkeeping, periodic reviews, and disciplined financial management create a strong foundation for compliance.

Corporate tax reviews by IRAS are a normal part of Singapore’s well-regulated business environment. Rather than viewing them as a challenge, businesses can see them as an opportunity to demonstrate accuracy, transparency, and professionalism.

By focusing on proper documentation, accurate reporting, and consistent compliance practices, companies can navigate IRAS reviews smoothly and efficiently. In doing so, they not only meet regulatory requirements but also strengthen their overall financial management—supporting long-term growth and stability.