What is the biggest GST audit trigger?

Consistently claiming refunds when you are not in an export or zero-rated industry. If your inputs exceed outputs for 3 consecutive periods, expect an inquiry.

What are shortfall penalties?

If IRD finds an error, you pay interest (UOMI) plus a penalty based on culpability. This ranges from 20% for lack of reasonable care up to 150% for evasion.

How do I dispute an IRD assessment?

The formal disputes process starts when IRD issues a Notice of Proposed Adjustment (NOPA). You have exactly 2 months to reply with a Notice of Response (NOR).

Verified for 2026 Tax Year

GST Audits & Disputes

Getting audited is stressful. Learn about IRD audit triggers, shortfall penalties, and how to fight a bad tax assessment.

The Inland Revenue Department (IRD) uses sophisticated data matching and automated triggers to spot anomalies in your GST returns. A simple arithmetic error is one thing, but aggressive tax positions can trigger full-scale investigations.

The #1 Audit Trigger

Consistently claiming refunds when you are not in an export or zero-rated industry. If your "Inputs" (purchases) exceed your "Outputs" (sales) for 3 consecutive GST periods, expect a phone call or desk review from the IRD.

Common Audit Areas

⚠️
Private Expenses: Trying to aggressively claim GST on groceries, school fees, or gym memberships as business expenses.
⚠️
No Tax Invoice: Claiming GST on large expenses without holding a valid tax invoice at the time of filing.
⚠️
Timing Errors: Claiming GST in April for an invoice dated May, or mixing up invoice vs payments basis rules.

Shortfall Penalties Explained

If the IRD finds an error, you don't just pay the tax back. You pay interest plus a severe penalty based on "culpability".

Lack of Reasonable Care / Unacceptable Position

20% Penalty

Gross Carelessness

40% Penalty

Evasion

150% Penalty + Prosecution

The Disputes Process

If you disagree with the IRD's assessment, you have the right to dispute it. The process is strict and highly formalized:

NOPA (Notice of Proposed Adjustment): IRD issues this legal document saying "we think you owe $X".
NOR (Notice of Response): You have exactly 2 months to reply formally with your legal reasons. If you miss this deadline, you forfeit your right to dispute.
Conference: A meeting between you and IRD to try and resolve the issue.
TRA (Taxation Review Authority): If no agreement is reached, the dispute goes to court.

Frequently Asked Questions

What is voluntary disclosure?

If you find a mistake BEFORE the IRD notifies you of an audit, making a Voluntary Disclosure immediately can reduce your shortfall penalties by up to 100%.

Will I go to court?

Most disputes are settled during the NOPA/NOR or Conference phases. Only complex legal disputes or cases of extreme evasion typically end up in the Taxation Review Authority or High Court.

Explore More