Decoupling means transferring all interest in the existing family home to one spouse so the other can buy the new GCB as a "first property" at 0% ABSD. On a $30M purchase this saves $6M (vs 20% second-property ABSD). The strategy works, but it must be genuinely structured — IRAS challenges sham decouplings.
How it works mechanically
- Spouse A transfers their 50% share of the existing family home to Spouse B (via sale at market value). BSD applies on the transfer.
- Spouse B now solely owns the existing home.
- Spouse A is now a "first-time" property buyer for ABSD purposes.
- Spouse A buys the new GCB — 0% ABSD as their "first" residential property.
What the savings look like
| Scenario | ABSD on $30M GCB |
|---|---|
| Without decoupling (second property) | $6,000,000 (20%) |
| With decoupling (first property each) | $0 |
| Decoupling cost: BSD on internal transfer | ~$50-200K typical |
| Net saving | ~$5.8-5.95M |
Risks
- IRAS anti-avoidance (Section 33A): If the decoupling is judged to be wholly for tax avoidance with no commercial substance, IRAS can collapse the structure and assess ABSD retrospectively + penalty.
- Family-law exposure: Concentrating both properties in different sole names changes the matrimonial-asset picture in the event of divorce.
- Estate planning: Single-name title affects intestacy outcomes.
Always run decoupling past a tax advisor + a private banker before executing on a $30M+ trade. The savings are real; the execution risk is non-trivial.
See our Decoupling Calculator for the BSD-on-transfer cost.