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. 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. When the refund exceeds that balance (the 99-1 trap), CPF Board caps the refund at the balance — on a market-value transfer there is no cash top-up — but the exiting owner’s CPF account receives that much less toward the next purchase.
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. This is the number that kills deals: 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?
- Four components: Buyer’s Stamp Duty on the transferred share (progressive, e.g. about $21,600 on a $900,000 half-share), Seller’s Stamp Duty if the property was bought within the SSD holding period, legal fees of roughly $5,500–$7,000 because each party needs separate conveyancing, and — the commonly missed item — the exiting owner must refund the CPF used plus accrued interest into their CPF account from their share of the proceeds. On a market-value transfer that refund is capped at the share proceeds after their part of the loan (a CPF Board rule): no cash top-up, but their CPF may receive less than the full amount owed.
- Is a 99-1 ownership split cheaper to decouple?
- Only when the 1% owner used almost no CPF. The BSD on a 1% share is tiny, but the CPF refund is not proportional to the share — it is the full amount that owner ever used plus accrued interest. If a 1% owner used $250,000 of CPF, the $18,000 share proceeds fall about $232,000 short of the refund. Sold at market value, CPF Board accepts the $18,000 as the full refund — no cash top-up is required — but the owner’s CPF account gets back only $18,000, wiping out CPF they may have counted on for the next purchase. (A below-market transfer does require topping up the difference in cash.) 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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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.