After the bank said no, a new plan across two states.

Cross-collateralisation means using more than one property to back a loan or linked loans. The properties are the security, which the lender can claim if the debt is not paid. It may assess their combined value for lending. These links can make it harder to sell one property, switch lenders or borrow against one property's equity.
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The security papers give the lender rights over both homes for the debts they cover. A home you live in and a rental can together back a loan to buy a rental. The contract states which debts each property backs.
Having several loans with one bank does not by itself prove that the properties are linked this way. What matters is which property backs which debt. Even loans with separate account numbers can have links between the properties that back them.
The lender checks what will be left to back the debt after the sale. It may need a fresh property value or some sale money to pay down linked debt. This can be a condition of releasing the home for sale. You cannot assume all the sale cash is yours to use.
Replacing one part of the borrowing can need a similar release. Changes in property values can shift the total security from where it was at purchase. If you fail to meet the loan terms, each home covered by the papers can be at risk. The lender may seek to recover debt from them.
A standalone loan has its own stated property backing it, rather than several homes backing that same debt. You can have a separate equity loan on your existing home to fund a deposit. The loan to buy the next home can then be backed only by that new home.
You still borrow extra money, and the lender must approve it. This setup does not remove the risk that you cannot repay. Nor does it prove a loan is free of every claim under the contract. The loan and mortgage terms must set out the actual links. Account names alone cannot do that.
For investors
A budget for each rental does not show all the links between loans and homes. These links can affect which property an investor sells first, the cash left from a sale and a lender switch. APRA describes how the total loans and values are used together. A low loan-to-value ratio across all your homes can still leave limits on a single sale or loan change.
Common questions
Keep learning
Cross-collateralisation is one piece of it. Lending rules decide how much you can borrow, and how soon you can buy again. Next, read about equity, refinancing and loan-to-value ratio.
If you want help
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