Decoupling Calculator
The four numbers that decide a decoupling
The ABSD saving is arithmetic. Whether decoupling actually works is decided on the financing side — the CPF refund, the cash you really free up, and whether one income can carry the whole loan.
The property
Exiting owner (selling their share)
Remaining owner (buying the share)
How this calculator works
Decoupling means one co-owner transfers their share of a private property to the other, so the exiting owner’s next purchase is taxed as a first property — 0% ABSD for a Singapore Citizen instead of 20%, or 5% instead of 30% for a PR. The transfer itself is a part-sale, and this calculator prices it the way a banker would, in four numbers.
One — the transfer cost. Buyer’s Stamp Duty applies on the transferred share at the standard progressive tiers. ABSD depends on the remaining owner’s citizenship and other homes; the calculator estimates the standard partial-interest remission, which the conveyancing lawyer must confirm. If the property was bought within the Seller’s Stamp Duty holding period (4 years for purchases from 4 July 2025; 3 years before that), SSD applies on the share too. Add conveyancing for both parties — each side needs its own lawyer.
Two — the cash actually freed. The exiting owner must refund the CPF used plus accrued interest into their own CPF account before seeing cash. Net cash = share value − their share of the loan − the CPF refund. For a part-share transfer, CPF Board takes the higher of the share-proceeds test and the exiting owner’s proportional share of the whole property’s balance proceeds, capped at the refund owed. In a 99-1 structure, that can make the required refund far larger than the 1% share proceeds and create a cash top-up.
Three — the solo loan. The remaining owner refinances the full outstanding loan plus the equity buyout in their sole name, stress-tested at 4% within the 55% TDSR cap over a tenure capped at age 65. Existing monthly debts count toward TDSR, while other outstanding housing loans can reduce the standard LTV cap from 75% to 45% or 35%. This is the number that kills deals: before other debts, a $1,150,000 sole loan over 25 years needs roughly $11,000/month of gross income.
Four — the verdict. The ABSD avoided on the next purchase, less the total cost to decouple. The calculator also shows the breakeven next-purchase price below which decoupling isn’t worth doing at all.
The full reasoning, including when decoupling is the wrong move, is in our article Decoupling Isn’t an ABSD Trick. It’s a Financing Decision.
Frequently asked questions
- What is decoupling in Singapore property?
- Two co-owners (usually spouses) restructure ownership so one transfers their share to the other. The owner who exits no longer holds residential property, so their next purchase is taxed as a first property — 0% ABSD for a Singapore Citizen instead of the 20% second-property rate. The transfer itself is a part-sale: it attracts Buyer’s Stamp Duty on the share, possibly Seller’s Stamp Duty, conveyancing for both parties, and a compulsory CPF refund.
- How much does decoupling cost?
- The transfer can attract BSD, ABSD based on the remaining owner’s citizenship and other properties, SSD if still within the holding period, and separate legal fees for both parties. A standard partial-interest remission may reduce the share-transfer ABSD, but the conveyancing lawyer must confirm eligibility. The exiting owner must also make their required CPF refund. For a part-share transfer, CPF Board uses the higher of the share-proceeds test and the owner’s proportional allocation of the whole property’s balance proceeds, capped at the amount owed. That refund can exceed the exiting owner’s share proceeds and require cash.
- Is a 99-1 ownership split cheaper to decouple?
- Only when the 1% owner has little required CPF refund. The BSD on a 1% share is tiny, but CPF Board’s part-share formula is not capped at that owner’s share proceeds: it also tests the owner’s proportion of the whole property’s balance proceeds. In a simplified debt-free $1.8M case where both owners must each refund $250,000, the exiting owner must refund the full $250,000 against only $18,000 of share proceeds — an estimated $232,000 cash top-up. Check both owners’ “What happens if” amounts before proceeding. Contrived 99-1 arrangements have also drawn IRAS clawbacks.
- Can HDB owners decouple?
- Generally no. HDB closed decoupling for married couples years ago; ownership transfers are allowed only in narrow circumstances such as divorce, death, or genuine financial hardship. Decoupling as an ABSD strategy applies to private property.
- What usually stops a decoupling from working?
- Financing, not stamp duty. The remaining owner must carry the entire loan on one income: the new sole-name loan is stress-tested at 4% within the 55% TDSR cap. On a $1.15M loan over 25 years that requires roughly $11,000/month of gross income. If both incomes were needed to service the original loan, the deal fails at loan approval — after the legal fees and BSD are already spent.
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Disclaimer
The tools on this page provide estimates for general reference only and do not constitute financial, legal, tax, or investment advice. Calculations are based on prevailing MAS, IRAS, HDB, and CPF rules and rates at the time of publication, which may change without notice. Actual figures — including loan eligibility, interest rates, stamp duties, and CPF usage — depend on your specific circumstances and the final assessment of banks, IRAS, and other relevant authorities. TRIBE makes no warranty as to the accuracy or completeness of any output and accepts no liability for decisions made in reliance on these tools. Please verify all figures with the relevant institutions or a qualified professional before committing to any transaction.