What IRAS Is Actually Looking at During GST Audits (Updated July 2026)

What IRAS Is Actually Looking at During GST Audits (Updated July 2026)

IRAS audits roughly 3,000 GST-registered businesses each year. That sounds like a lot until you realise there are over 400,000 GST-registered businesses in Singapore - your odds of being picked are low. But if you are, the findings are almost always the same kind of mistake.

IRAS updated its "Current Areas of GST Audits" page on 17 July 2026. The focus areas are straightforward:

1. Dormant businesses making input tax claims without taxable supplies
2. Input tax claims not supported by valid tax invoices or import permits
3. Under-declaration of output tax on taxable supplies
4. Blocked input tax claims - GST on motor vehicles, entertainment, club memberships that shouldn't have been claimed
5. Discrepancies between GST returns and corporate income tax filings

None of these are sophisticated fraud. They're bookkeeping errors. The kind that happen when nobody's reconciling the GST return against the actual accounts each quarter.

What this means for SMEs

Here's the pattern I see: a business files its GST return based on rough estimates or last-minute tallies. The numbers are close but not exact. Over several quarters, small gaps accumulate. Then IRAS's data-matching system flags a discrepancy between GST revenue and corporate tax turnover, and an audit letter arrives.

The fix isn't complicated. Reconcile your GST returns to your accounting records every quarter before you file. Make sure every input tax claim has a valid tax invoice. Don't claim GST on blocked items. If your accounting software categorises expenses correctly from the start, most of these issues never arise.

Audit-ready is a habit, not a project

The businesses that handle audits cleanly usually do one thing differently: they treat audit readiness as an ongoing practice, not a scramble when the letter arrives.

Keep your tax invoices filed and retrievable. Reconcile each quarter. Review blocked input tax categories annually. If you spot an error before IRAS does, the Voluntary Disclosure Programme lets you correct it with significantly reduced penalties.

Source: IRAS, 17 Jul 2026
https://www.iras.gov.sg/taxes/goods-services-tax-(gst)/getting-it-right/gst-audits-by-iras/current-area-of-focus-for-audits