Question: Could a routine review of your accounts reveal hidden risks that affect your company’s bottom line?
This guide explains what a revenue authority review typically involves, who it applies to, and why it matters for businesses that file corporate income returns or GST.
IRAS is the statutory body that oversees compliance and enforcement. A Year of Assessment (YA) ties reported income to the prior financial period, for example YA 2026 covers income earned from 1 Jan 2025 to 31 Dec 2025.
Readers will learn the end-to-end steps, the documents an officer may request, and practical ways to prepare. We introduce key terms such as information notice, audit team, field visit and return listings, so finance teams can follow confidently.
Expect a professional, cooperative tone: clear records and timely, documented responses help move matters along. For an official overview of GST reviews, see this overview by the authority.
Key Takeaways
- Know that review selection is risk-based and does not assume wrongdoing.
- Keep clear records and a computerised accounting system to reduce disruption.
- Understand required listings and the Year of Assessment concept.
- Cooperate with officers, provide workspace and timely answers.
- Voluntary disclosure can reduce penalties if irregularities arise.
- Treat readiness as normal corporate governance for growing companies.
Why IRAS conducts tax audits and what they aim to achieve
Revenue authorities carry out reviews to confirm that reported figures match a company’s underlying records.
Core objective: to verify the accuracy of tax returns and ensure outcomes reflect the facts and records for the relevant year.
Programmes also aim to raise compliance awareness and correct recurring filing mistakes. They help identify areas where guidance or policy could be simplified.
How they approach businesses
Selection may be routine or risk-based and does not automatically imply wrongdoing. Many reviews validate reporting or clarify business models.
Authorities typically issue query letters and requests for information. Responding clearly and on time reduces delays and limits follow-up queries.
Practical benefits for firms
- Clean bookkeeping and steady controls shorten review time.
- Well-supported claims minimise disputes and potential errors.
- Cooperation and transparency help resolve matters and lower escalation risk.
| Objective | What it checks | Benefit to business |
|---|---|---|
| Accuracy | Figures in tax returns vs records | Correct liability; fewer adjustments |
| Compliance awareness | Filing habits and disclosures | Fewer future queries; better practices |
| Policy feedback | Recurring issues or unclear rules | Improved guidance and simplified steps |
Common triggers that put companies on IRAS’ radar
Certain filing habits and unexplained ledger gaps often draw supervisory attention.
Late or incorrect filings, inconsistencies and weak records
Late filings and incorrect returns are obvious triggers. Unexplained variances year-on-year or mismatched figures across schedules also raise concern.
Weak record-keeping — missing invoices, partial receipts or unclear approval trails — creates exposure even when there is no intent to underpay. Keep paperwork for at least five years to support compliance.
High-risk indicators that warrant closer look
Under-reported income, unusually high expense ratios and GST input claims that do not match business activity are red flags.
Large asset purchases that do not align with declared profits, cash-heavy sectors like F&B or retail, director expense claims and odd intercompany charges are practical examples to watch for.
| Trigger | Why it matters | Quick action |
|---|---|---|
| Late or incorrect returns | Shows weak controls and attracts review | Monthly close and prompt filing |
| Missing invoices/receipts | Hinders verification of claims | Maintain organised source records |
| Unusual GST claims | May indicate non-business expenses | Match input claims to operations |
| Unexplained year variances | Suggests reporting errors | Document management review |
Preventative steps: reconcile monthly, log management reviews and keep a clear audit trail for one-off items. Treat compliance hygiene as ongoing, not just a deadline task.
Singapore tax audit process IRAS step-by-step: from first contact to field visit
A reviewer will usually contact your company by phone or e-mail to confirm the visit, list documents and state the Year of Assessment under review.
Receiving contact and scope details
On first contact, note the visit date, the precise assessment year and any preliminary questions. Ask for the formal information notice in writing so you can check deadlines and required formats.
What an information notice asks for and how to reply
An information notice typically specifies which return sections and records are in scope. It names ledgers, bank statements and supporting schedules and gives a response deadline.
How to respond: acknowledge receipt, clarify unclear points quickly, propose realistic delivery times and nominate one accountable point of contact from management or an authorised agent.
Preparing for the visit and on-site expectations
Reserve a workspace, brief key staff and pre-pack requested files with a clear index. Ensure staff availability for interviews and keep copies of original records ready.
Officers will show their authority cards. The typical team size is three to four officers and the visit often begins with an opening interview covering business size, operations, structure, roles, bookkeeping and internal controls.
Interviews and duration
Inspectors may interview managers, staff, agents or tenants. Cooperative, consistent and truthful answers help resolve queries without escalation.
Many reviews finish in one to three days. Timing extends where records are incomplete, transactions are complex or follow-up queries arise. Good record-keeping shortens the time and supports swift compliance outcomes.
Documents and records IRAS may request during an audit
Having key documents ready cuts response time and reduces follow-up queries from reviewers.
Focus on three areas: accounting books, source paperwork and electronic exports. These form the core of what a reviewer will inspect when verifying figures in returns.
Accounting books and supporting schedules
General ledgers, journals and external auditor adjustments should be available and indexed. Also keep working papers that show how figures in tax returns were compiled.
Source documents and governance evidence
Provide invoices, receipts, contracts and explanations for unusual items. Include bank statements and board or management minutes that support major decisions or one-off entries.
Electronic records and practical preparation
If records are in an accounting system or cloud drive, prepare exports for the requested periods. Reconcile those exports to summary schedules so the review team can retrieve information quickly.
Keep a simple log of what you supply, when it was sent and in which format. This helps maintain continuity if there are follow-up queries and supports good compliance practice.
| Category | Examples | Why it matters |
|---|---|---|
| Accounting records | General ledger, journals, audit adjustments | Shows how figures in returns were derived |
| Source documents | Invoices, receipts, contracts | Validates income and deduction claims |
| Bank & governance | Bank statements, board minutes, management notes | Supports major transactions and decisions |
| GST substantiation | Tax invoices, GST workings, input claim support | Addresses common indirect tax compliance risks |
For further official guidance on how individuals and companies may be reviewed, see this overview of audits on individuals.
Audit vs tax investigation: understanding the difference and the potential consequences
Understanding when a compliance check becomes an investigation helps firms prepare and respond. The practical difference rests mainly on intent and scope.
Focus and approach
Audits check the accuracy of a company’s figures and reconcile returns with records. They are usually documentary and aim to confirm compliance.
Investigations seek evidence of deliberate evasion. They are more intrusive and evidence-driven.
What may occur during investigations
Investigative teams can conduct in-person checks, record formal statements from staff and request hard and soft copies of files.
Officers may, where authorised, seize devices to access emails or documents relevant to the enquiry.
Penalties, outcomes and voluntary correction
Potential penalties range widely. Where there is no clear intent, surcharges may reach 200% of undercharged amounts, plus fines and limited imprisonment.
For deliberate evasion, penalties can rise to 400% of the undercharged amount, with higher fines and longer sentences. These outcomes vary with the facts of each case.
Fixing past errors
If a firm discovers earlier errors, document them, quantify the impact and consider voluntary disclosure. The VDP can reduce penalties when disclosures are prompt and complete.
When facing multi‑year issues or complex GST treatment, engage qualified advisers to protect compliance and manage outcomes.
Conclusion
Organised records and timely replies usually shorten inspection timelines and lower the chance of follow‑up queries. At a high level, audits check why reviews happen, common triggers, how field visits proceed and which documents officers typically request.
Practical takeaway: maintain consistent compliance routines and keep working papers that tie back to the return. Reconcile ledgers to bank statements, store minutes and contracts accessibly, and ensure electronic exports are indexed for easy retrieval.
Remember that an inspection is often a verification exercise rather than an accusation. A professional, cooperative approach helps most companies reach a swift resolution with minimal disruption.
Next step: review your documentation system now, fix gaps before an official contact, and consult a qualified adviser if you suspect prior errors or complex taxation positions involving IRAS.
FAQ
What are the main objectives when the Inland Revenue Authority conducts an audit?
Does being selected for an inspection mean my company did something wrong?
What common triggers put companies on the authority’s radar?
Which risk indicators most often lead to further scrutiny?
What happens when the authority first contacts my company?
What does an information notice usually request and how should we respond?
How should we prepare for an on‑site visit to reduce business disruption?
What occurs during an on‑site visit?
Who might be interviewed and why is cooperation important?
How long can a review or field visit take?
Which accounting and bookkeeping records should we expect to produce?
What source documents are commonly requested during an inspection?
How should electronic records be handled for review?
How does a routine review differ from an investigation into suspected evasion?
What powers can investigators exercise during a serious inquiry?
What penalties and outcomes might result from identified errors or misconduct?
What is the Voluntary Disclosure Programme and how can it help?
Dean Cheong is a Singapore-based B2B growth strategist and the CEO of VOffice. He helps companies scale revenue through sharper sales execution, CRM implementation, and go-to-market strategy, backed by a strong foundation in business banking and finance from Nanyang Technological University and a track record of driving sustainable, performance-led growth.