The mortgage stamp duty calculator works out the stamp duty payable on your home loan facility in Singapore, which is 0.4% of the loan amount, capped at S$500. Enter your loan amount and it returns the exact duty in seconds.
What this calculator does
When you take a home loan, the mortgage document securing that loan attracts its own stamp duty, separate from the Buyer's Stamp Duty on the property purchase. This calculator takes your loan amount and applies the mortgage duty rate, showing the small but mandatory fee you must budget alongside your other completion costs. It is a niche figure, but one every buyer with a loan needs to account for.
How mortgage stamp duty is calculated
Mortgage duty in Singapore is charged at 0.4% of the loan amount granted, subject to a maximum of S$500. Because the cap is reached at a loan of S$125,000, almost every home loan in practice pays the flat S$500. The duty is rounded down to the nearest dollar and is subject to a minimum of S$1. The same rate applies to both residential and commercial property loans.
A lower rate of 0.2% (also capped at S$500) applies to an equitable mortgage, which is a less common loan arrangement executed informally with the property as security. Where an additional loan is later secured under an existing open mortgage, the duty payable is only the difference between S$500 and any duty already paid, and nothing further is due once the S$500 cap has been reached.
A worked example
For a typical home loan of S$1,125,000, the headline 0.4% would be S$4,500, but because the duty is capped at S$500, you pay S$500. Even on a modest loan of S$200,000, 0.4% is S$800, which is again capped at S$500. Only for loans below S$125,000 does the duty fall under the cap, for example a S$100,000 loan attracts S$400. The calculator applies the cap automatically so you always see the correct payable amount.
Who should use it
Buyers itemising their completion costs use it to capture this fee alongside Buyer's Stamp Duty and legal fees. Anyone refinancing or taking an additional loan under an existing mortgage uses it to check whether further duty is due. It is also useful for commercial property buyers, since the same rate and cap apply.
Why it matters
Although small, mortgage stamp duty is a required cost that is easy to overlook when budgeting for a purchase. Knowing it is effectively a flat S$500 for nearly all home loans lets you fold it cleanly into your upfront cash planning, with no surprises at completion. Itemising it correctly also helps when comparing the full cost of buying across different properties or loan sizes.
Frequently asked questions
How much is mortgage stamp duty in Singapore?
It is 0.4% of the loan amount, capped at S$500. Since the cap is hit at a S$125,000 loan, almost all home loans pay the flat S$500.
Is mortgage stamp duty the same as Buyer's Stamp Duty?
No. Buyer's Stamp Duty is charged on the property purchase price, while mortgage stamp duty is charged on the loan document that secures your home loan. They are separate costs.
Do I pay mortgage duty if I buy without a loan?
No. Mortgage duty applies only to the loan facility. A cash purchase with no mortgage has no mortgage stamp duty, though Buyer's Stamp Duty still applies.
Does the same rate apply to commercial property?
Yes. The 0.4% rate and the S$500 cap apply to both residential and commercial property loans.
When do I pay it?
Mortgage duty is paid when the mortgage is executed, typically handled by your conveyancing lawyer at completion alongside the other stamp duties.
This guide reflects mortgage duty rules current in 2026 and is for general information only. Confirm your liability with IRAS or your conveyancing lawyer.
Sarah Chen
