I Received a Letter from IRAS About GST — What Should I Do?

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March 3, 2026

Receiving a letter from IRAS about GST can instantly raise your stress levels.

Whether it is titled “GST Review”, “Request for Information”, “Compliance Check”, or something more serious, your first reaction might be:

Did I make a mistake?
Am I being audited?
Will I be fined?
Do I need to respond immediately?
Should I get professional help?

If you have received a GST-related letter from IRAS, do not panic. But do not ignore it either.

This article will guide you step by step on:

Why IRAS sends GST letters
The different types of GST notices
What you should do immediately
What not to do
When to engage a GST accounting firm
How to protect your business moving forward

First: Why Did IRAS Contact You?

IRAS does not send GST letters randomly. There is usually a trigger.

Common reasons include:

1. Routine GST Compliance Review

IRAS conducts regular checks to ensure businesses are:

Filing correctly
Reporting accurately
Claiming input tax properly

This does not automatically mean you did something wrong.

2. Data Mismatch

IRAS compares:

GST returns
Corporate income tax returns
Accounting data
Industry benchmarks

If something looks inconsistent, you may receive a query.

3. Late Filing or Late Payment

If you filed late or paid late, IRAS may issue notices.

4. High Input Tax Claims

If your input tax claims appear unusually high compared to revenue, IRAS may request supporting documents.

5. Late GST Registration

If your revenue crossed S$1 million and you did not register promptly, IRAS may issue a letter regarding compulsory registration.

Types of GST Letters from IRAS

Not all letters are equal. Understanding what you received is important.

1. Request for Information (RFI)

This is usually the least serious.

IRAS may ask for:

Tax invoices
Supporting documents
Clarification on specific transactions

You are typically given a deadline to respond.

2. GST Compliance Review

This is more detailed.

IRAS may request:

Full GST workings
Sales and purchase listings
Reconciliation statements
Contracts or agreements

This is not yet an audit — but it requires careful preparation.

3. GST Audit Notification

This is more serious.

It means IRAS intends to review your GST position in depth.

An audit may involve:

On-site visits
Detailed document review
Interviews with staff
Review of accounting systems

4. Assessment of Underpaid GST

If IRAS believes GST was under-reported, they may issue:

Notice of Assessment
Demand for payment
Penalty computation

This requires immediate professional attention.

What Should You Do Immediately?

If you received a GST letter, follow these steps calmly.

Step 1: Read the Letter Carefully

Do not skim it.

Check:

What period is under review?
What documents are requested?
What is the response deadline?
Is this a review, audit, or assessment?

Understanding the nature of the letter is critical.

Step 2: Do Not Ignore It

Ignoring IRAS correspondence will worsen the situation.

Failure to respond can lead to:

Estimated assessments
Additional penalties
Escalation of enforcement

Step 3: Gather Your GST Records

Collect:

GST returns filed (F5 forms)
Sales listings
Purchase listings
Tax invoices
Supporting documentation
Accounting reports

Do not submit incomplete or disorganized records.

Step 4: Consider Engaging a GST Accountant

This is especially important if:

You are unsure about your GST computations
Your bookkeeping is messy
You suspect mistakes were made
The letter mentions audit or penalties
You missed GST registration deadlines

Professional handling can significantly reduce risk.

Common GST Issues IRAS Looks For

Understanding what IRAS typically examines can help you assess your exposure.

1. Incorrect Input Tax Claims

Common errors include:

Claiming GST on non-business expenses
Claiming without proper tax invoices
Claiming disallowed expenses (e.g., certain motor vehicle expenses)

2. Under-Declared Output Tax

This may occur due to:

Missing invoices
Wrong tax codes
Revenue not captured
Timing differences

3. Incorrect Zero-Rating

Businesses exporting goods sometimes incorrectly apply zero-rating without proper documentation.

IRAS requires strict proof of export.

4. Late GST Registration

If your revenue exceeded S$1 million and you delayed registration, IRAS may:

Backdate your registration
Assess GST payable from earlier date
Impose penalties

What Not to Do

When stressed, business owners sometimes make mistakes that worsen the situation.

Avoid the following:

❌ Do Not Submit Guesswork

If you are unsure about figures, do not estimate casually.

Incorrect responses can trigger deeper audits.

❌ Do Not Ignore Past Mistakes

If you discover errors, address them properly.

Trying to hide mistakes can escalate penalties.

❌ Do Not Delay Professional Advice

The earlier a GST accountant reviews your case, the more options you have.

What Happens During a GST Audit?

If your case escalates to audit, expect:

Detailed review of GST returns
Examination of supporting documents
Reconciliation of sales and purchases
Review of accounting system controls
Clarification meetings

The audit may cover multiple years.

Preparation is key.

Possible Outcomes After IRAS Review

After reviewing your case, IRAS may:

1. Close the Case with No Adjustment

If everything is in order, the matter ends.

2. Issue Adjustment Assessment

If underpaid GST is identified, you must pay:

Outstanding GST
5% late payment penalty
Possible additional penalties

3. Impose Additional Penalties

In more serious cases, IRAS may impose:

Up to 200% penalty on tax undercharged (depending on circumstances)
Enforcement actions for serious non-compliance

Early cooperation usually helps reduce severity.

How a GST Accounting Firm Can Help

If you received a GST letter, professional support can provide:

✔ Case Review

Examine your GST returns
Identify potential exposure
Assess risk level

✔ Document Preparation

Organize required documents
Ensure completeness
Verify accuracy

✔ Draft Professional Responses

Clear explanations
Proper technical references
Structured documentation

✔ Liaise with IRAS

Handling communication professionally reduces emotional stress and prevents misstatements.

✔ Rectify Historical Errors

If mistakes are found, accountants can:

Compute correct adjustments
Advise on voluntary disclosure
Reduce penalty risk

The Importance of Voluntary Disclosure

If you discover errors before IRAS completes review, voluntary disclosure may:

Reduce penalties
Demonstrate good faith
Show proactive compliance

Professional advice is essential before making disclosures.

How to Prevent Future GST Issues

Once this matter is resolved, consider strengthening your GST processes.

1. Proper Bookkeeping System

Use structured accounting systems with correct tax codes.

2. Quarterly GST Review Before Filing

Do not blindly submit returns.

Review:

Output tax reconciliation
Input tax claims
Unusual fluctuations

3. Revenue Monitoring

Track turnover regularly to avoid late registration issues.

4. Engage Professional GST Services

Outsourcing GST compliance reduces risk significantly.

Why You Should Not Take GST Letters Lightly

GST is a self-assessed tax.

This means:

You are responsible for correctness.
IRAS expects proper compliance.
Ignorance is not a defense.

However, honest mistakes handled responsibly are usually treated more reasonably than deliberate non-compliance.

Final Thoughts: Stay Calm, Act Smart

If you received a GST letter from IRAS:

Do not panic.
Do not ignore it.
Do not respond casually.
Assess your situation properly.
Engage professional support if needed.

Many GST reviews are resolved smoothly when handled correctly.

The key is structured preparation, accurate documentation, and professional communication.

If you are unsure how to respond to IRAS, or if you want experienced support in reviewing and managing your GST matters, it is wise to seek professional assistance early.

Find out more at https://www.shkoh.com.sg/gst-accounting-services-singapore/