What is cross-collateralisation, and should I avoid it?

Bayley Clarke · Mortgage broker on the road · Last checked 12 November 2026 · 7 min read

The short answer

Cross-collateralisation is when the bank holds two or more of your properties together as security for your loans, instead of each property backing its own loan. My default is to keep them separate, and only cross when there's a real reason.

Crossing doesn't make the bank come after you harder if you stop paying. It can do that either way. What crossing changes is control. It ties your properties together at one lender, so selling one, refinancing one or pulling equity becomes a decision about all of them, and the bank gets the final say.

Cross-collateralisation vs standalone loans

With standalone loans, each property secures its own loan and nothing else. Sell the investment and it's mostly about that property and that loan. With crossed loans, the bank holds the whole bundle as security for the whole debt. It's common when someone buys a second place using equity from the first, and the bank simply ties both titles to everything owed rather than matching one loan to one property.

On the default side, crossing changes less than people think. If you stop paying, a bank can pursue what you own whether the loans are crossed or not. The real extra exposure is while you're paying on time: the bank has more say over your home, because your home is now part of every decision about the other properties: All my properties are in my name. Does cross-collateralising really make it riskier for me and my home?

Not sure if your properties are crossed?

Send me your loan details and I'll work out how your securities sit, what that means if you sell or refinance one, and whether it's worth untangling.

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Selling one cross-collateralised property

The loans were given on the premise that the properties stay together. So when you sell one, the bank wants to know the numbers still work on what's left, and it gets a say in how much of your sale money goes to the debt. Its test is usually that the remaining loans sit at or under 80% of the remaining property's value, so you're not pushed into lenders mortgage insurance territory.

To give you a bit of an idea: the property you're keeping values at $600k and you owe $700k in total. 80% of $600k is $480k, so roughly $220k of your sale proceeds goes to the debt before the bank releases the title. If the sale nets $300k after costs, you walk away with about $80k. That's why a fresh valuation on the property you're keeping matters so much: I have two properties cross-collateralised at the bank and I want to sell one. How does it work?

Can I refinance just one property?

If each property secures its own loan, refinancing one is a normal refinance. The new lender values that property, pays out that loan, and the rest carry on as they were. It comes up a lot when one loan is sitting on a horrible rate and the others are fine: Can I refinance just one of my properties and leave the rest with my current bank?

If they're crossed, your current bank has to be happy with what's left before it lets one title go. It'll revalue the remaining properties and recalculate. If the loans left behind end up over 80%, it may want debt paid down or lenders mortgage insurance, and that can wipe out whatever you were going to save. Sometimes moving everything and separating the securities properly at a new lender is the cleaner answer. That's covered more broadly in Why won't the bank let me refinance?

Using equity without crossing

You can use your home's equity to buy the next property without tying the two together. The lender releases equity from your home as its own loan split against your home, and the new purchase gets its own loan against the new property. Two securities, two sets of loans, nothing bundled.

How much can you use? Up to 80% of what the bank values your property at, less what you already owe, and only if your income supports the bigger total debt. Worth $800k, owe $400k: 80% is $640k, so about $240k usable. A higher valuation moves that number, which is why it can pay to get more than one opinion: How much of my equity can I actually use to fund the next property?

Keeping the purposes separate matters too. Anything borrowed for an investment stays as its own loan, full stop, so the interest is easy to show at tax time: Should I combine my home loans into one, or keep them separate?. The full equity picture lives in How much of my equity can I actually use?

When crossing makes sense

Sometimes it genuinely is simpler. If you're using equity in your home to buy an investment, the numbers are comfortable and you've no plans to sell or move either loan, crossing can mean less paperwork. Honestly, it's also sometimes a bit lazy, because it saves setting things up properly.

So the question isn't whether crossing is good or bad. It's whether it suits what you're planning next. If you might sell, refinance one loan, or move one property to a different lender in the next few years, separate securities keep those doors open. If you're not sure how yours is set up, your loan documents or your bank will show which titles secure which loans, and that's the first thing I check.

The honest part

Crossing rarely hurts on the day it's set up. It hurts years later, when you want to sell one property, move one loan or buy the next, and find the bank holds the keys to all of them. Ten minutes on structure at the start saves a lot of untangling later.

Set up your next purchase without the strings

Tell me what you own, what you owe and what you're planning. I'll structure the equity release and the new loan so each property stands on its own.

Book a 30 minute call Call 0437 189 939

No application, no credit check, nothing on your file. Just the numbers.

Common questions about cross-collateralisation

What is cross-collateralisation?+

It's when a lender uses two or more of your properties together as security for your loans, instead of each property securing its own loan. It's common when equity from one property is used to buy another with the same bank.

Is cross-collateralisation bad?+

Not always, but it gives the bank more control. Selling, refinancing or borrowing against one property becomes a decision about all of them. Standalone loans keep your options open, which is why many brokers prefer them by default.

What happens if I sell one cross-collateralised property?+

The bank revalues what you're keeping and usually wants the remaining loans at or under 80% of its value. Any gap is paid down from the sale proceeds before the bank releases the title, so a fresh valuation on the property you keep matters.

Can I uncross my loans?+

Usually, yes. Either your current lender restructures the securities, or you refinance and set each property up with its own loan at a new lender. Whether it's worth it depends on the values, what you owe and what you're planning next.

Can I use equity without cross-collateralising?+

Yes. The equity from your home can be released as its own loan secured by your home, and the new property gets its own loan secured by the new property. Nothing is bundled, and each loan can be sold, refinanced or moved on its own.

Next question

How much of my equity can I actually use?

The 80% rule, valuations, and why equity is not the same as borrowing power.