There are three ways to buy and sell a house at the same time in Australia: sell first and buy afterwards, buy first using a bridging loan, or line both contracts up and settle them on the same day. Each one moves the risk to a different place. Selling first risks the market moving away from you, buying first risks carrying two mortgages, and settling both on the same day risks one delay collapsing the whole chain.
Nobody enjoys this part. You have found the bigger house, you have a house to get rid of, and the order you do them in decides whether the move costs you $20,000 or $120,000. Last updated August 2026.
The three paths, compared
| Sell first, then buy | Buy first with bridging | Simultaneous settlement | |
|---|---|---|---|
| You own | Nothing in between | Two properties for a while | One, then the other, same day |
| Extra finance needed | None | Bridging facility | Usually none |
| Biggest risk | Priced out or renting in between | Old home sells slow or under price | One delay breaks the chain |
| Cost if it goes wrong | Rent plus a second move, plus a rising market | Months of extra interest on peak debt | Penalty interest and possible breach of contract |
| Negotiating position when buying | Strong, you are cash ready | Strong, you can go unconditional | Weaker, your purchase depends on your sale |
| Best when | The market is soft or flat | You have found the right home and cannot lose it | Both parties are flexible and well advised |
| Stress level | Moderate | High if the sale drags | High on the day, low before it |
Path 1: sell first, then buy
You list, sell, exchange contracts, and then go shopping with a known number in your pocket.
Why it works. You know exactly what you got for your home, so your budget is real rather than an appraisal range. You have no bridging interest. Your finance is simple, because you are a normal buyer with a deposit. And in a market where houses are taking longer to move, being the buyer with unconditional funds is worth something at the negotiating table.
Why it hurts. In NSW the standard settlement period is 42 days from exchange. That is six weeks to find and exchange on the next place if you want to avoid a gap. Miss it and you are renting, storing furniture and moving twice. Two moves in Sydney is a $5,000 to $8,000 problem before you count the rent.
The fix most people use. Negotiate a long settlement on your sale. Ninety or 120 days on the sale contract buys you time to find the next place without carrying two loans. Buyers will often agree if the price is right, and it costs you nothing except patience. If you want the mechanics of what your home actually nets after commission, marketing and discharge fees, run it through our property selling costs calculator.
Path 2: buy first with a bridging loan
You buy the new home now and sell the old one afterwards, with a bridging facility covering the gap.
The lender combines your existing mortgage, the new purchase price and the buying costs into a single balance called peak debt. Interest on the bridging portion usually capitalises, so you are not making repayments on it while you are also paying removalists. When the old home sells, the net proceeds come off peak debt and what is left becomes your long term loan, called end debt. Importantly, lenders assess your income against end debt, not peak debt, because they are assuming the sale happens.
Why it works. You never lose the house you actually want. You move once. You present the old place empty and styled, which usually sells better than a home with three kids and a dog still living in it.
Why it hurts. If the old home takes eight months instead of three, the extra interest is real money and it compounds onto your end debt. In a market where Sydney house values fell 4.6 percent over the June quarter, an optimistic sale price assumption is expensive.
Our bridging loans guide for Sydney upgraders works through peak debt, end debt, open versus closed bridges and a full Hills District example. If you are going down this path, read that one next.
Path 3: simultaneous settlement, both on the same day
Your sale and your purchase settle on the same day, with the sale proceeds flowing straight into the purchase. In NSW this happens through PEXA, the electronic settlement platform, and in practice the sale settles a short time before the purchase so the funds are there when they are needed.
Why it works. No bridging interest. No renting. No second move. You go to bed in the old house and wake up in it, then hand over the keys and pick up new ones on the same day. It is the cheapest of the three paths when it works.
Why it hurts. Everything has to line up. Your conveyancer is coordinating two sets of solicitors, two lenders and two agents. Your bank has to have processed the discharge authority on the old loan, which can take weeks on its own, and your new lender has to be ready to fund. Both matters need to be confirmed ready for settlement at least a day beforehand. If the sale funds do not arrive, you can be in default on your purchase even though the delay was not your fault, and penalty interest applies at the rate written into your contract.
The timeline, week by week
This is what a simultaneous settlement looks like in NSW when it runs properly. Adjust for your own contract dates.
| When | What happens |
|---|---|
| Week 0 | Broker confirms finance for the purchase. Agent appraisals done. Discharge authority requested from your existing lender. |
| Weeks 1 to 3 | Home goes to market. You inspect and negotiate on the purchase in parallel. |
| Week 4 | Exchange on the sale. Cooling off in NSW is five business days for the buyer, and pulling out costs them 0.25 percent of the price. |
| Week 4 or 5 | Exchange on the purchase, with the settlement date matched to your sale. Formal approval issued. |
| Weeks 5 to 9 | Valuation on the new property, loan documents signed and returned, conveyancers order searches and prepare settlement figures. |
| Week 9 | Both matters confirmed ready for settlement. Final inspection on the property you are buying. |
| Week 10 | Settlement day. Sale settles, funds flow, purchase settles, keys change hands. Standard NSW settlement is 42 days from exchange, so week 10 is a realistic landing point. |
What happens to your existing home loan
This is the part people assume will sort itself out. It does not.
If you sell. Your existing loan is discharged at settlement. The sale proceeds pay out the balance, the lender releases its mortgage over the title, and the land registry records the discharge. The registry fee for a discharge of mortgage in NSW is $182.73 from 1 July 2026, plus a PEXA fee of $26.29 and whatever your lender charges as a discharge administration fee. Small money. The delay is the paperwork, not the cost.
If you are on a fixed rate. Breaking a fixed loan early can trigger break costs, and they are calculated on the lender's funding position rather than a fixed penalty. Ask your lender for a break cost quote in writing before you commit to a settlement date. The number changes daily.
If you want to keep the loan. Some lenders allow loan portability, where the same loan moves to the new property. It avoids a full discharge and a new application. It only works if both settlements happen on the same day and the loan amount is not changing much, which is exactly the simultaneous settlement scenario. Worth asking about.
If you are keeping the old house. Then this is not a sale at all, and you are in equity release territory. Our guide on using equity to buy your next home walks through the usable equity calculation and the keep or sell comparison, and our home equity service covers the structures.
Why a soft market can favour upsizers
Here is the part most people get backwards. If you are selling and buying in the same market, a falling market usually helps you, because you are trading up.
Cotality's Home Value Index released on 3 August 2026 had Sydney dwelling values down 1.4 percent in July, 4.0 percent over the quarter and 5.3 percent below the January 2026 peak, with houses falling faster than units. The RBA held the cash rate at 4.35 percent on 11 August 2026, a second consecutive hold, and does not expect inflation back near the middle of its target band until late 2027.
Take our example household. They own a home worth $1,850,000 and want one worth $2,200,000. The gap is $350,000. Now apply a 5 percent fall to both:
- Their home: $1,850,000 x 0.95 = $1,757,500, so they lose $92,500
- The target home: $2,200,000 x 0.95 = $2,090,000, so it drops $110,000
- New gap: $2,090,000 minus $1,757,500 = $332,500
The gap narrowed by $17,500. And because NSW transfer duty is charged on the price you pay, the duty falls too. At 2026/27 rates, duty on $2,200,000 is $52,237 plus 5.5 percent of the amount over $1,290,000, which is $102,287. On $2,090,000 it is $52,237 plus 5.5 percent of $800,000, which is $96,237. That is another $6,050 saved.
Total benefit of the fall: about $23,550, before you count the extra negotiating room that comes with elevated listing stock and softer auction clearance rates.
The same maths runs in reverse in a rising market. A 5 percent rise widens the gap by $17,500 and adds $6,050 of duty. That is the real argument for not waiting: if you are trading up, the market moving against your own home is moving further against the one you want. Check your own numbers on the NSW stamp duty calculator.
Protecting yourself in the contract
- Match the settlement dates in writing. Do not agree to a purchase settlement date before your sale date is locked. A single day of misalignment is the whole problem.
- Ask for a sunset or subject to sale clause if you are exposed. It weakens your offer, so use it only when the alternative is genuinely unaffordable.
- Build in a delay clause. Some conveyancers negotiate a grace period of a few days before penalty interest applies. Vendors often agree, because they would rather settle late than sue.
- Do not release your deposit early on the purchase unless your solicitor is comfortable.
- Get the discharge authority in early. Repeating it because it is the thing that breaks most deals.
- Budget the full round trip. On a $1,850,000 sale and a $2,200,000 purchase, selling costs run about $55,000 and buying costs about $109,000, so around $164,000 of friction. Our breakdown of the real cost of upsizing in Sydney itemises every line.
If the numbers are tight, our home loan options page covers the products behind each path, and the loan repayment calculator will show you what the new loan actually costs each month.
Ready to line up your sale and your purchase?
The order you do this in is a finance decision before it is a real estate decision. Get the structure right and the rest is logistics.
We will look at your equity, test what you can service, tell you whether bridging is worth it or whether a long settlement solves the problem for free, and coordinate with your conveyancer so the dates actually match. We are in Norwest and we do this constantly for Hills District families.
Call 1300 11 7976, book a free strategy call, or get in touch. We compare 50+ lenders.
Quick answers
Frequently asked questions
Yes, and most upsizers do. You have three options: sell first and buy afterwards, buy first using a bridging loan, or settle both contracts on the same day. Same day settlement is the cheapest because you avoid bridging interest and renting in between, but it needs both contracts aligned and both lenders ready. Selling first is the safest financially. Buying first is the safest emotionally, because you never lose the home you want. Your income, equity and how tight the sale timing is decide which one fits.
In a softening market, selling first is usually the safer play, because the risk of your home selling below expectation is higher than the risk of prices running away from you. Sydney values were 5.3 percent below the January 2026 peak in July, and listings are elevated, so buyers have time. If you have found a home you genuinely cannot replace, buying first with bridging still makes sense, but price your sale conservatively and build a six month bridging period into the plan rather than three.
It is when your sale and your purchase settle on the same day, with proceeds from the sale funding the purchase. In NSW it runs through the PEXA electronic settlement platform. Your conveyancer coordinates both sets of solicitors, both lenders and both agents, and in practice the sale settles slightly before the purchase so the money is available. Both matters must be confirmed ready for settlement at least a day earlier. It is the cheapest way to move, and the most sensitive to delay.
Your purchase can fall over with it. If the sale funds do not arrive, you may be in default under the purchase contract even though the cause was outside your control, and penalty interest applies at the rate written into that contract. In a worst case the vendor can terminate and keep the deposit. This is why lenders and conveyancers push so hard on having the discharge authority processed early and both matters confirmed ready the day before.
Plan for about ten weeks from listing to keys. The standard settlement period in NSW is 42 days from exchange, and you need three to four weeks before that to run a marketing campaign and exchange. Add time if your lender is slow on the discharge or if a valuation on the purchase comes in low. Longer settlements of 90 or 120 days are common when someone in the chain needs breathing room, and they cost nothing to negotiate.
On a $1,850,000 Sydney sale, expect roughly $55,000: agent commission at around 2.1 percent, a marketing campaign of $3,000 to $12,000, conveyancing, mortgage discharge fees and pre sale styling. On a $2,200,000 purchase, expect about $109,000, of which $102,287 is NSW transfer duty at 2026/27 rates. That is roughly $164,000 in total. It is the single biggest reason upsizers should be confident they will stay in the next home for a while.
Not always. If you have enough usable equity and the serviceability to carry both loans, you can release equity against your current home instead and buy with a standard loan. Bridging is specifically for when you need the full purchase price funded before the sale proceeds arrive. A deposit bond plus a long settlement is a third option that solves the exchange problem without funding the whole purchase. A broker can tell you in one conversation which of the three you actually need.
Sometimes. Loan portability lets you substitute the new property as security for the same loan, which avoids a full discharge and a new application. It generally requires both settlements on the same day and a similar loan amount. If you are borrowing significantly more, most lenders will treat it as a new application anyway. Ask your lender for their portability policy before you assume it, because the answer varies and it is not always worth the constraints.
Five business days from exchange of contracts, ending at 5pm on the fifth day. It protects the buyer, not the vendor. A buyer who pulls out during cooling off forfeits 0.25 percent of the purchase price. Cooling off does not apply if the property is bought at auction or if the buyer waives it with a section 66W certificate, which is common in competitive markets. If you are the one selling, expect serious buyers to waive it.
Usually not in Sydney. Six months of rent on a family home plus two moves and storage will often exceed the bridging interest on a three or four month bridge. Run both numbers rather than assuming. Renting does have one genuine advantage, which is that it removes all timing pressure and lets you buy well. If you are trading up in a falling market, that patience can be worth more than the cost.
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