Home Loan Rate Lock Explained Before Cup Day

You've signed the contract. Settlement is six weeks away. Then you see it on the news: the Reserve Bank decides on rates this Tuesday, Cup Day, at 2.30pm.

Your first thought is simple. Which rate do we actually get?

It's a fair question, and the answer surprises a lot of first home buyers. So let's walk through how it works, and where a rate lock fits in.

Your rate is set at settlement, not approval

Most people assume the rate on their approval letter is the rate they'll pay. Usually it isn't.

On a variable loan, you get the lender's variable rate on the day the loan settles. After that it moves whenever the lender moves it.

A pre-approval doesn't hold a rate either. It tells you roughly how much a lender is happy to lend. It's not a promise on price.

So if rates rise between your approval and your settlement, the new rate applies from day one.

What a rate lock actually is

A rate lock is an option some lenders offer on fixed rate loans. You pay a fee, and the lender holds today's fixed rate for a set window while your purchase goes through.

That window is commonly up to 90 days. Some lenders offer shorter windows, so check the one you're dealing with.

A few things to know before you get excited:

• It's for fixed rates only. You generally can't lock a variable rate.
• There's a fee. It varies a lot between lenders. Some charge a percentage of the loan, some a flat amount, and a few charge nothing.
• The fee is usually non-refundable. Once it's processed, it's spent, even if rates fall.
• It may not be available at pre-approval. Some lenders only let you lock once you've applied for the loan on a specific property.

Want to see what a lock might cost on your loan, and whether the timing works for your settlement date? Book a chat and we'll go through it together.

What happens when rates move

This is where lenders differ, so read the fine print.

Some lenders give you the locked rate if you settle inside the window. Others give you whichever is lower, the locked rate or the rate on settlement day. That second version protects you if rates rise and still lets you benefit if they fall.

If settlement runs past the window, most lenders apply the fixed rate on the day you settle. You usually still pay the lock fee. Some will let you buy a new lock, at the new rate, for another fee.

Also worth knowing: fixed rates don't only move after a Reserve Bank meeting. Lenders price them off their own funding costs, so they can change on any day of the week.

The trade-offs of fixing

A rate lock only makes sense if a fixed rate suits you in the first place. That's a bigger decision than the lock.

• Fewer features. Fixed loans often limit extra repayments, and many don't come with an offset account.
• Break costs. If you sell or refinance during the fixed term, you may pay a fee to get out.
• The revert rate. When the fixed term ends, the loan usually rolls onto a variable rate, often the lender's standard one.
• Split loans. Some couples fix part of the loan and leave the rest variable, which keeps some certainty and some flexibility.

None of these is right or wrong. It comes down to how much certainty you want on repayments versus how much flexibility you want to pay the loan down faster.

Questions to ask before you lock

If you're weighing up a lock, these are the questions that matter:

• Is a lock available on this product, and at what stage?
• What's the fee, and when is it charged?
• When does the window start? Often it's when the lender receives your signed request, not when you sign the contract of sale.
• Do I get the locked rate, or the lower of the two?
• What happens if settlement is delayed?

Write the answers down next to your settlement date. If the window and the date don't line up, you'll know before you pay.

We've helped over 100 first home buyers into the market, and the Cup Day question comes up every time rates are in the news. If you'd like a hand comparing fixed, variable and split options for your loan, book a chat.

Let's get you into a home.

Figures verified 29 October 2026 against the NAB Rate Lock fact sheet, Canstar's rate lock guide and Aussie's November 2026 RBA preview.