On 17 March 2026, IRAS tax investigators conducted island-wide raids across more than 20 business premises and residential locations, seizing accounting records, electronic devices, and 179 luxury watches worth over $1 million, as part of an investigation into suspected GST refund fraud. The raid followed a year in which IRAS audited more than 1,300 businesses making GST refund claims and recovered over $100 million in taxes and penalties.
Every GST registered company in Singapore now files against that enforcement backdrop. IRAS has named four specific areas where its audit activity is currently concentrated, publishing common errors, real case outcomes, and the exact penalty provisions that apply to each. Understanding what falls into these four areas, and what a genuine mistake versus a red flag looks like within them, is the clearest way to assess your own exposure before an audit letter arrives rather than after.
This guide covers all four areas in detail: what IRAS is looking for, the errors that most commonly trigger scrutiny, and the consequences a business or sole proprietor actually faces.
Key Takeaways
Per IRAS's guidance on current areas of GST audits, IRAS uses a risk-based approach to identify compliance risks and builds specific audit programmes around the industries and transaction types where non-compliance is most concentrated. The four named areas below are not the only grounds for an audit, but they represent where IRAS has explicitly stated its current enforcement attention sits, and where the published common errors give any GST-registered business a direct checklist to review its own filings against.
Missing Trader Fraud is a fraudulent scheme used by syndicates to defraud the government, typically structured as back-to-back purchase and sale arrangements designed to generate fraudulent input tax claims and zero-rated export supplies. IRAS treats involvement seriously regardless of whether a business knowingly participated, and conducts extensive audits and investigations on businesses and individuals suspected of being drawn into such arrangements.
Per IRAS's record of past GST audits, one company purchased electronic components from newly incorporated GST-registered suppliers for resale to overseas customers assigned by a third party, was promised a fixed profit margin, and was not required to hold inventory at any point. The company did not perform due diligence on its suppliers, was found to be involved in a Missing Trader Fraud arrangement, and had to repay more than $10 million in previously claimed input tax plus penalties.
Businesses found involved in these arrangements face consequences that scale sharply with the degree of involvement:
IRAS has embarked on an audit programme specifically targeting GST-registered businesses that claim low-value GST refunds, to verify the legitimacy of these claims rather than assuming smaller refund amounts carry lower scrutiny. Audit actions under this programme include site visits to verify business operations, interviews with key personnel, and requiring businesses to review past GST returns and disclose any errors found.
Five errors account for most of the non-compliance IRAS has identified in this area: dormant businesses making input tax claims without any taxable supplies to support them, claims not backed by tax invoices or import permits addressed to the business, claims made on disallowed expenses such as motor car or medical costs, claims made on private expenses including food and beverage for family members or utilities and maintenance fees for a residential property, and zero-rated export supplies not supported by proper export documentation.
The private-expenses error catches home-based businesses particularly often. One company operating from a residential premise claimed input tax on household utilities, phone charges, and residence maintenance fees; IRAS disallowed the claims entirely, since these expenses are predominantly personal in nature even where the business genuinely operates from that address. A separate company made zero-rated export supplies to overseas customers but could not produce proper export documents when audited; IRAS was not satisfied the goods had actually left Singapore, standard-rated the supplies retroactively, and recovered GST at the prevailing rate on the full transaction value.
Businesses found to have submitted incorrect GST returns under this area face a penalty of up to twice the amount of tax undercharged, and may be liable upon conviction to a fine of up to $5,000, imprisonment of up to 3 years, or both, under Section 59 of the GST Act.
GST-registered businesses selling business assets, including non-residential property, must charge and account for GST based on the consideration received, with the exact timing depending on which type of payment is involved.p
The most common mistake in this area is not charging GST on the property sale at all, or omitting the corresponding output tax from the GST return entirely. A second frequent error involves timing: some businesses account for GST on the option fee only once the option is exercised or the sale completes, when the correct treatment requires accounting for GST at the earlier point when the fee is actually received or invoiced. Getting this specific timing wrong does not change whether GST is ultimately owed, but it misstates which accounting period the output tax belongs in, which is exactly the kind of discrepancy an IRAS audit is built to catch.
GST registration for a sole proprietor is tied to the individual, not to any single business, which means every taxable income stream under that person's name must be accounted for together in one set of GST returns, regardless of how many separate businesses or activities generate it.
A sole proprietor must charge and account for GST on the taxable turnover of every sole-proprietorship business they operate, on the sale or lease of non-residential property, or the sale and lease of furniture and fittings in a residential property where the individual is in the property business, and on any other taxable income from a trade, profession, or vocation carried out as a self-employed person. IRAS specifically flags driving a taxi or private-hire car, freelancing as a fitness instructor, bookkeeper, or property agent as examples of income streams that fall within this last category and are frequently omitted because the individual assumes the income is separate from their registered business.
Practitioner's Note: The most common trigger for this error is not deliberate concealment but a genuine misunderstanding of how sole-proprietor GST registration works. A person may correctly file GST for one business while assuming a second, smaller sole-proprietorship or a freelance sideline sits outside the same registration entirely, when in fact both must be reported together because the registration attaches to the individual rather than to a specific trading name.
Errors under this area carry the same penalty structure as Area 2: up to twice the amount of tax undercharged, plus a fine of up to $5,000, imprisonment of up to 3 years, or both, upon conviction.
Discovering a discrepancy in a past GST return during a review of any of these four areas is not, by itself, a reason to expect the maximum penalty. Per IRAS's guidance on voluntary disclosure, a business or sole proprietor that comes forward with an error before IRAS identifies it independently qualifies for substantially reduced penalties, and in some cases penalties may be waived entirely. Waiting until an audit is already underway removes this option, since voluntary disclosure only applies to errors IRAS has not yet found on its own.
The four areas IRAS has named span very different kinds of businesses: syndicates running deliberate fraud schemes, home-based businesses claiming input tax on personal utilities, property sellers timing an option fee incorrectly, and sole proprietors who genuinely did not realise a second income stream needed to be reported together with their main business. The penalty regimes reflect that range, from ordinary filing corrections at up to twice the undercharged tax through to Missing Trader Fraud sentences measured in years rather than months.
What connects all four areas is that IRAS has made the common errors public before enforcing against them, which means a GST-registered business reviewing its own filings against this list today is acting on exactly the same information IRAS itself is using to select audit targets. For a broader view of how these audit risk areas interact with day-to-day GST filing obligations, ATHR's GST filing guide covers the return preparation practices that reduce exposure across all four areas at once.
Reviewing GST returns against IRAS's four current audit focus areas requires more than a general compliance check; it means specifically checking input tax claims against disallowed expense categories, confirming export documentation is complete, verifying property sale GST timing, and, for sole proprietors, consolidating every income stream under one registration.
ATHR provides accounting and tax services, covering GST return preparation and pre-filing review against known audit risk areas, alongside corporate secretary services for businesses that want their broader compliance position reviewed as part of the same engagement.
👉 Ready to review your GST filings against IRAS's current audit priorities? Book a free consultation with ATHR today →
The ATHR Content Team is a group of professional writers from Singapore and the Philippines, committed to delivering informative, practical, and engaging content for business owners across Southeast Asia.
