Most upgraders still owe money on their HDB when they start dreaming about a condo — that’s completely normal. What’s not widely understood is how much that outstanding loan changes the maths of your next purchase. It’s not a minor footnote. A single unpaid housing loan can cut your borrowing power roughly in half and add hundreds of thousands to the cash you need upfront.
Here’s exactly what an outstanding HDB loan does to your condo purchase, why it pushes almost everyone toward selling first, and the narrow cases where it doesn’t.
The calculator applies the 45% LTV that kicks in while your HDB loan is outstanding — so you see the real downpayment.
The headline: LTV drops from 75% to 45%
When you take a home loan and have no other outstanding housing loan, you can borrow up to 75% of the property’s value. But if you already have one outstanding housing loan — your HDB loan — your new condo loan is capped at just 45%.
| Your loan situation | Max LTV on condo | Downpayment required |
|---|---|---|
| HDB loan fully discharged | 75% | 25% (5% cash + 20% cash/CPF) |
| HDB loan still outstanding | 45% | 55% (25% cash + 30% cash/CPF) |
On a $1.5 million condo, that’s the difference between a $375,000 downpayment and an $825,000 one — and the cash-only portion jumps from $75,000 to $375,000. For the vast majority of upgraders, that 55% downpayment is simply out of reach while the HDB loan stands.
It also eats your TDSR headroom
The LTV hit is only half the story. Your existing HDB loan repayment is a monthly debt obligation — so it counts inside your 55% TDSR ceiling, reducing the room left for your new mortgage.
Suppose your HDB loan costs $1,500/month. At a combined gross income of $14,000, your TDSR cap is $7,700. That HDB repayment alone consumes nearly 20% of your available headroom before you add a single dollar of condo mortgage. The full TDSR mechanics — including the 4% stress test — are in TDSR for HDB Upgraders.
So an outstanding HDB loan hits you twice: it caps your LTV at 45% and shrinks the loan your income can support. Both gates tighten at once.
Why this forces most people to sell first
Put the two effects together and the conclusion writes itself. While your HDB loan is outstanding:
- You can only borrow 45% → you need 55% down.
- Your TDSR headroom is reduced by the HDB repayment.
When you sell the HDB, the sale proceeds automatically redeem the loan — discharging it. The moment that loan is gone, your condo LTV resets to 75% and your full TDSR headroom returns. This is the single biggest financial reason the sell-first path suits most upgraders. It’s not just about avoiding ABSD — it’s about unlocking a normal-sized loan.
The narrow exceptions
Buying with the HDB loan still outstanding can work, but only for a specific profile:
- You have very deep cash and CPF reserves — enough to fund a 55% downpayment plus stamp duties without strain.
- You’re using a bridging loan to cover the gap until your HDB sale completes and frees up the proceeds (more on this below).
- Your HDB loan is genuinely tiny and you can fully repay it from savings before the condo loan is assessed — effectively discharging it early.
For everyone else, trying to carry both is how upgrades stall at the financing stage.
What about a bridging loan?
A bridging loan is a short-term facility (typically up to 6 months) that advances you the expected proceeds from your HDB sale before they actually arrive. It can smooth the timing if your condo completes shortly before your HDB sale does. But note: a bridging loan is itself debt, and banks factor it into your TDSR. It’s a timing tool, not a way to escape the 45% LTV — that only lifts once the HDB loan is truly discharged. I cover how bridging fits into coordinated timing in Simultaneous HDB Sale and Condo Purchase.
The bottom line
An outstanding HDB loan caps your new condo loan at 45% LTV — a 55% downpayment — and simultaneously trims your TDSR headroom. Unless you’re sitting on exceptional reserves, the clean solution is to sell your HDB first, let the proceeds discharge the loan, and reset to a full 75% LTV. Plan your sequence around this reality and your financing falls into place; ignore it and your dream unit stays just out of reach.
Net cash from your HDB sale, ABSD exposure, and the condo budget you can actually afford — worked out in about 2 minutes.
General information for Singapore HDB upgraders, not financial advice. LTV and TDSR rules are set by MAS and can change. Confirm your borrowing position with a bank or mortgage broker before committing.