It’s the classic upgrader’s dilemma: the perfect next home hits the market before you’ve sold your current one. Sell first and you risk having nowhere to buy; buy first and you’re paying for two properties. A bridging loan is built for exactly this gap — the lender temporarily carries both properties so you can buy now and sell on your timetable, not under pressure.
The two numbers that matter: peak debt and end debt
Bridging is easiest to understand as two snapshots:
- Peak debt — everything you owe during the bridge: your existing loan, plus the full purchase price of the new home, plus costs (stamp duty, legals).
- End debt — what’s left once your old home sells and the proceeds are paid down. This is the loan you actually live with, and it’s the number the lender assesses you can afford long-term.
During the bridge (typically up to 6–12 months) most lenders let you pay interest only — and many will capitalise it, meaning no repayments at all until the sale, with the interest added to the balance instead.
A worked Sydney example
Say your current home is worth about $1.2m with a $400k loan, and you’re buying at $1.5m:
- Peak debt: $400k + $1.5m + roughly $70k in duty and costs (NSW duty on $1.5m is about $64k on the FY2026-27 scale) ≈ $1.97m — briefly.
- Your home sells for $1.2m; after agent and legal costs (~$30k) and clearing the $400k loan, about $770k comes off the debt.
- End debt: ≈ $1.2m — and that’s the loan the lender tests your income against, not the scary peak number.
The one risk that matters: what if it doesn’t sell? Every bridging risk is really this one. If the sale drags past the bridge term, interest keeps compounding and the lender can push for a price cut. The protections are boring and effective: a realistic (bank-valuation, not agent-appraisal) price on your current home, a bridge period with buffer, and a property that’s genuinely saleable. We stress-test all three before recommending a bridge.
What lenders look for
- Equity — bridging lives on it. As a rule of thumb you want solid equity across both properties; thin equity makes the bridge fragile.
- Servicing on the end debt — you need to comfortably afford the loan that remains after selling.
- Both valuations — the lender values both homes; be ready for the bank’s number, not the appraisal on the fridge.
The alternatives (sometimes better)
- Sell first, then buy — with a longer settlement or a short rental in between. Less elegant, zero bridging risk, and you buy knowing your exact budget.
- Buy subject to sale — vendors accept it in slower markets; useless at auction.
- Deposit bond — solves the 10% deposit timing, not the whole purchase.
- Straight upgrade with equity — if you can service both loans outright, you may not need a formal bridge at all.
The right answer depends on your equity, income and how fast homes like yours are selling. Start with your borrowing power on the calculator, get a pre-approval sorted, and check the duty bill with the stamp duty calculator before you fall in love with anything.
General information only — not financial or credit advice. Bridging structures, terms and rates vary significantly by lender; figures above are illustrative.