What is a 66W certificate? Waiving your cooling-off period in NSW
A 66W removes your right to walk away in the first five business days. Here is what you give up, when it makes sense, and when we will not sign one.
Agents ask for a 66W more often than most buyers expect, usually in the middle of a negotiation and usually with some urgency attached. It is a fair thing for a seller to want. It is also the fastest way to remove every protection you have left. Before you agree to one, it is worth knowing exactly what you are handing over.
At a glance
- The NSW cooling-off period runs to 5pm on the fifth business day after exchange. Pulling out inside it costs you 0.25% of the purchase price.
- A 66W certificate gives that up completely. From the moment it is handed over you are committed, and your full deposit is at risk if you cannot complete.
- We will only sign one once your finance is formally approved and your inspections and contract review are done. That is the whole safety net, so it has to be in place first.
What is the cooling-off period in NSW?
When you buy a residential property by private treaty in NSW, the contract does not lock you in straight away. You get a cooling-off period that runs to 5pm on the fifth business day after contracts are exchanged. If you change your mind in that window you can walk away.
It is not free. You forfeit 0.25% of the purchase price, which on a $900,000 property is $2,250. The rest of your deposit comes back to you.
Those five days exist so you can finish the things that are hard to complete before exchange: formal loan approval, pest and building inspections, the strata report if there is one, and our review of the contract so you understand what you have signed. If you are buying off the plan the period is longer, at 10 business days.
So what is a 66W certificate?
A 66W certificate is a short document, named after section 66W of the Conveyancing Act 1919, that cancels your cooling-off period. It must be signed by a solicitor or a licensed conveyancer, and that person has to certify they do not act for the seller.
Once it is handed to the seller’s side, your cooling-off right is gone. The contract binds you from that moment. There is no notice period and nothing left to reconsider.
In plain English
Think of the cooling-off period as a five day “are you sure?” button. A 66W is you pressing “yes, I’m sure” before the five days have even started. Nothing else about the purchase changes. You just lose the button. And once it is gone, changing your mind stops being a small fee and starts being a very expensive problem.
Why sellers and agents ask for one
In a competitive market a 66W makes your offer stronger. Two offers at the same price are not equal if one of them can evaporate in five days and the other cannot. Sellers also ask because they are buying something themselves and need certainty before they commit to it.
None of that is improper. It is worth naming, though, because the benefit of a 66W flows almost entirely to the seller. What you get back is the deal itself, which counts for a lot if it is a property you want in a market where you keep getting outbid.
What you are actually giving up
Inside the cooling-off period, changing your mind costs 0.25%. After a 66W, changing your mind is a breach of contract. The seller can terminate, keep the full deposit, usually 10% of the price, and pursue you for their losses if the property later resells for less.
On that same $900,000 purchase, the difference is roughly $2,250 against $90,000, and potentially more. That gap is the entire reason we take this seriously.
“Inside the cooling-off period, changing your mind costs 0.25%. After a 66W, it can cost the whole deposit and more.”
When we will sign one, and when we will not
We are not here to talk you out of a 66W. Plenty of purchases are done this way and it is often the right call. What we will not do is sign one while something is still unresolved, because the cooling-off period is the only thing standing between you and that risk.
Before we sign, we want three things done: formal written loan approval, not a conditional approval and not a verbal indication from a broker; pest and building inspections completed and read, or a strata report where it applies; and the contract reviewed, with anything unusual either negotiated or properly explained to you.
If those three are done, a 66W costs you very little, because you have already used the cooling-off period for its purpose before exchange. If they are not, you are being asked to carry that risk personally, and we will tell you so plainly.
A 66W is the only document in a standard purchase that takes a protection away from you rather than adding one.
When there is no cooling-off period anyway
Sometimes there is nothing to waive. There is no cooling-off period if you buy at auction as the successful bidder, or if contracts are exchanged on the same day the property was passed in at auction on auction terms. There is also none where the land is more than 2.5 hectares, because it falls outside the definition of residential property in the Act. Option agreements work differently again.
If someone asks you for a 66W in one of those situations, something has been misunderstood. Call us before anyone signs anything.
What changed in the 2026 contract
A new edition of the Contract for the Sale and Purchase of Land applies from 1 June 2026, and it is now the only compliant version for residential contracts in NSW. One of the changes is the cooling-off notice itself. The prescribed wording is new, and a contract exchanged on or after that date carrying the older 2022 notice does not meet the statutory requirement. The 2026 edition also adds an anti-money laundering warning.
None of this changes how a 66W works. It does mean that if you are handed a contract that was drawn up some time ago, it is worth checking which edition it sits on before you go any further.
If you are being pushed
Urgency is the point of the pressure. A seller who wants a 66W wants it now, and the request usually arrives late in the day with a deadline attached.
You are allowed to say that your conveyancer needs to see the contract first. If the answer is that there is no time for that, the answer itself tells you something about the transaction. Ten minutes on the phone with us will tell you whether the risk is real in your case.
The alternatives
Waiving is not the only way to make an offer look serious. A shorter cooling-off period can be negotiated, five days cut back to two or three, which gives the seller most of the certainty they are after while leaving you a genuine way out.
You can also do your due diligence before you make the offer, so you are ready to sign a 66W on the spot when it counts. That means paying for inspections on a property you might not get. In a market where you are competing hard, it is usually the cheaper mistake.
Take the booklet with you
We have a plain English booklet covering the same ground, useful to have on your phone at an open home or when an agent raises it. Download the free PDF version here.
Been asked to sign a 66W?
Send us the contract before you agree to anything. We will tell you where you actually stand.
