How Much Condo Can You Afford While You Still Own Your HDB?

If you already own an HDB flat with an outstanding loan, the Total Debt Servicing Ratio (TDSR) is usually what decides how large a condo you can buy, not the price you have in mind. As at September 2026, TDSR caps all your monthly debt repayments at 55% of your gross monthly income, including your existing HDB loan instalment. For most HDB-owning households, that existing instalment quietly eats into the room left for a second property loan, so the honest answer to "how much condo can I afford" is usually smaller than the headline numbers on a listing suggest.

What TDSR actually caps

TDSR is a Monetary Authority of Singapore (MAS) framework, not a policy that varies by bank. It limits the sum of all your monthly debt obligations to 55% of your gross monthly income, as at September 2026. That sum includes home loans, car loans, personal loans, student loans, credit card minimum payments, and the new property loan you're applying for.

Two details change the maths in ways people often miss:

• Banks must assume an interest rate of at least 4% a year when computing your TDSR, even if your actual mortgage package offers a lower rate. This "stress test" floor has applied since September 2022, and protects you from over-borrowing if rates rise later.
• Variable income is counted at only 70% of its value, including bonus, commission, rental and freelance income. If your income is mostly fixed salary, this matters less; if a large share is bonus or rental income, your effective TDSR income is lower than your payslip suggests.

Your HDB loan already uses up part of your TDSR headroom

This is the part that catches HDB upgraders off guard. Whether your flat loan came from HDB or a bank, that monthly instalment is a debt obligation like any other. It sits inside the 55% cap and reduces, dollar for dollar, what's left over for a new condo loan.

If you're used to thinking about the Mortgage Servicing Ratio (MSR), the 30% cap that governs HDB and EC loans, note that MSR does not apply once you're buying a private resale or new launch condo. Only TDSR applies to the condo loan itself. But the HDB loan you took out under MSR rules doesn't disappear from the picture: it's still a live monthly obligation that TDSR counts against you.

A worked example

Consider a couple with a combined gross monthly income of $12,000. They still owe $1,500 a month on their HDB loan and $600 a month on a car loan.

• TDSR ceiling: 55% of $12,000, which is $6,600 a month
• Existing obligations: $1,500 plus $600, which is $2,100 a month
• Room left for a new condo loan: $6,600 minus $2,100, which is $4,500 a month

Assuming a 25-year loan tenure and the 4% stress-test rate, and that both borrowers are comfortably within the age limits that would otherwise force a shorter tenure, a repayment capacity of $4,500 a month supports a loan of roughly $850,000.

The 45% LTV limit on a second home loan changes the sum again

Because the couple is keeping their HDB flat, the condo loan is their second housing loan, and the maximum loan-to-value (LTV) ratio drops from 75% on a first home loan to 45%, with at least 25% of the price required in cash.

An $850,000 loan at 45% LTV corresponds to a condo price of roughly $1.89 million (850,000 divided by 0.45). Below that price, the bank's 45% LTV cap is the binding constraint, and the couple isn't yet using their full TDSR headroom. Above it, the loan the bank will extend stays capped at roughly $850,000 regardless of price, because TDSR, not LTV, becomes the limit. Every additional dollar above $1.89 million has to come from cash or CPF, not the mortgage.

At a $1.89 million purchase price, the couple would need to fund the remaining 55% (about $1.04 million) through cash and CPF, of which at least 25% of the price (around $474,000) must be cash. For most HDB-upgrading households, that cash quantum, not the loan itself, becomes the real ceiling on what they can afford.

Stamp duties add a separate, upfront cash requirement

Buyer's Stamp Duty (BSD) and Additional Buyer's Stamp Duty (ABSD) are both payable in cash or CPF within 14 days of the sale and purchase agreement, on top of your down payment.

On the same $1.89 million condo, BSD works out to roughly $64,000 under the progressive rates in force since February 2023 (1% on the first $180,000, rising in steps to 6% above $3 million). As a Singapore Citizen keeping the HDB flat, the condo is a second residential property, so ABSD of 20% applies (rates in force since 27 April 2023), adding a further $378,000. Together that's over $440,000 in stamp duty alone, before you even factor in renovation or moving costs.

Ways to widen what you can actually afford

• Pay down other debts first. Clearing a car loan or personal loan before applying frees up that amount, in full, for TDSR headroom on the condo loan.
• Refinance the HDB loan if it lowers your instalment. A smaller existing repayment directly increases your TDSR room for the new loan, though you should weigh any penalty or subsidy clawback first.
• Sell the HDB flat instead of keeping it. This removes the existing loan from your TDSR calculation, restores the 75% LTV limit on the condo as a first loan, and avoids ABSD entirely, though it also means giving up rental income or a fallback home. Our guide to selling your HDB flat walks through that trade-off.
• Get an Approval-in-Principle (AIP) early. A bank's AIP gives you your real, bank-verified number before you start viewing, rather than an estimate based on a listing price.
• Run your own numbers. Our mortgage calculator lets you test different incomes, existing debts and tenures to see your own TDSR-driven loan ceiling.

Frequently asked questions

Does MSR apply if I already own an HDB flat and want to buy a condo?

No. MSR only governs new loans for HDB flats and executive condominiums. A condo, resale or new launch, is assessed under TDSR alone. Your existing HDB loan, taken under MSR rules, still counts as a monthly obligation inside your TDSR calculation.

Can I use my CPF Ordinary Account savings for the condo's down payment?

You can use CPF, subject to the CPF Board's usage rules and the amount you've already used for your HDB flat, but the details depend on your individual CPF balances and the flat's outstanding loan. It's worth having this checked against your actual CPF statements rather than assuming a figure.

Does decoupling from the HDB flat help my TDSR position?

Decoupling means transferring your share of the HDB flat to your spouse so you can buy the condo in your own name. It can affect ABSD liability and the debts counted against each of you, but it carries its own legal, tax and CPF costs and isn't a straightforward TDSR shortcut. It needs individual advice before you commit to it.

What if a large part of my income is bonus, commission or rental income?

MAS guidelines require banks to count only 70% of variable income toward your TDSR, including bonus, commission, rental and freelance earnings. If most of your income is fixed salary, this affects you less; if a large share is variable, your effective borrowing power will be lower than your gross pay suggests.

What this means for you

TDSR, not the price on a listing, is usually the real ceiling on what condo you can afford while your HDB loan is still running. Before you start viewing, work out your own numbers: existing debts, income mix, and the LTV tier you'll fall into as a second loan, ideally with an Approval-in-Principle in hand. If you'd like to work through your numbers against the W.A.T.E.R and C.L.E.A.R framework, we can help you plan your move from HDB to condo with a clear-eyed view of what you can genuinely afford, not just what you're approved for.