The 99-to-1 "loophole": why IRAS is clawing it back, with a 50% surcharge

If someone’s pitched you a “99-to-1” arrangement to soften the Additional Buyer’s Stamp Duty (ABSD) on your next property, here’s the short version: IRAS already knows about it, and it’s been unwinding these deals for years — full duty back, plus a 50% surcharge, plus in at least one case, jail time.

What “99-to-1” actually is

The idea is simple on paper. A property’s ownership gets split 99% to one owner and 1% to another, so that only the small 1% share changes hands at the key step. Because that step involves such a small share, the stamp duty on it looks tiny.

The hope is that this sidesteps ABSD, which applies from a person’s second residential property onward — commonly cited at 20% for a Singapore Citizen’s second home, higher again for a third, and higher still for permanent residents and foreigners. Current rates change over time, so check IRAS’s ABSD page for what applies to you.

It doesn’t work the way it’s pitched. IRAS has both the legal power and the enforcement data to unwind it.

IRAS can just look through it

Under Section 33A of the Stamp Duties Act, IRAS isn’t limited to taxing the paperwork you filed. If it decides a series of steps was arranged mainly to avoid duty, it can disregard the separate steps, treat the whole thing as one joint purchase, and reassess the full ABSD that should have applied — plus a 50% surcharge on the amount clawed back.

And there’s no expiry date on this. There’s no statutory time limit on IRAS stamp duty audits — arrangements can be reviewed years after settlement, so time passing isn’t protection.

It’s gone criminal, too

What tips IRAS off, and what courts weigh, isn’t the paperwork alone — it’s timing and substance. In the convicted case, the 1% share was transferred just days after the purchase. IRAS also has enough data across cases to spot a formulaic, repeated pattern. And in court, the test is “substance over form”: who actually paid for the property and who services the loan matters more than how the shares are split on paper.

You may hear advisors mention a “wait 36 months” rule of thumb before restructuring ownership. That is not an official IRAS rule or a safe harbour — it’s an informal heuristic, and it offers no guarantee against a Section 33A review.

Agents and lawyers aren’t insulated either

Around 10 of the reviewed cases were referred to the Council for Estate Agencies (CEA) over possible agent involvement. Beyond that, clients who got caught have gone further and sued the property agents and conveyancing lawyers who arranged these structures — trying to recover the ABSD and surcharge they were left holding.

Where’s the honest line?

To be fair to genuine cases: not all co-ownership restructuring is a problem. A married couple adjusting shares because one spouse never contributed financially, or a family reorganising ownership for estate planning — done long before any new purchase, for a real non-tax reason — is a different animal from a 99:1 split engineered specifically to dodge ABSD on a new buy.

IRAS and the courts look at genuine purpose and substance, not just the existence of a split. If the only reason for the arrangement is avoiding ABSD, that’s the one that gets unwound.

The maths was never that great anyway

Even setting the legal risk aside, the “saving” is thinner than it looks. Transferring a share still attracts Buyer’s Stamp Duty on that share. Seller’s Stamp Duty can apply if you’re within the holding period. And any CPF monies used have to be refunded — with accrued interest. By the time all that’s accounted for, the arrangement rarely delivers what it promised before you even get to the audit risk.

Get proper advice, not a shortcut

If ABSD is the obstacle in your upgrading plans, there are legitimate ways to plan around timing, financing, and eligibility — they just don’t involve engineering paper splits to dodge a tax IRAS is actively watching for. Your specifics deserve a real answer, not a rule of thumb: talk to IRAS directly and get a qualified conveyancing lawyer to review anything before you sign.

A good agent’s job is to tell you what actually holds up, not sell you a shortcut that unravels later. If you’re weighing a sale-and-upgrade and want the numbers done straight, that’s a conversation worth having early.

Sources

• MOF — Tax avoidance cases found and amounts clawed back under “99-to-1” arrangement
• MOF — Policy on “99-to-1” arrangements for stamp duty payment
• IRAS — Mother and son first convicted of giving false and misleading information during stamp duty audit
• The Independent — First prosecuted case of lying to IRAS to avoid full stamp duty
• Singapore Law Watch — Clients caught in a 99-to-1 arrangement sue to recover the ABSD clawed back
• IRAS — Additional Buyer’s Stamp Duty (ABSD) reference