Broker guide
Cross Collateralisation: Structuring and Release
One property sale can affect several loans when security is shared. Compare cross collateralisation with standalone loans and plan a workable release.
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Cross collateralisation is a loan structure where a lender uses more than one property to secure the same debt or group of debts. Selling one property can require a review of the debt and security that remain. Separate loan accounts don’t establish that each property secures only its own loan.
For a broker reviewing a portfolio, start with the mortgage and facility documents. Map which property supports which debt before estimating what a sale will leave your client.
Map Property to Debt
Map each mortgage to the facilities it secures, then add any guarantee and the obligations it covers. Account names such as “home” and “investment” describe the accounts, but the security documents decide the lender’s rights.
A facility is the lending arrangement under which an account or several accounts operate. Record the borrower, property owner, registered mortgage holder and mortgage priority for each property. Add current balances, approved limits and the documents defining the secured debt.
Two Properties and Two Loans
This fictional portfolio has a home worth $800,000 and an investment property worth $600,000. The home loan balance is $400,000 and the investment loan balance is $480,000. Both properties belong to the same borrower.
The example contains only those two debts, and the borrower has no guarantor.
The table compares two possible structures for those same properties and balances. Assume each mortgage has the stated scope and there are no clauses extending it to other facilities.
| Item | Shared security | Standalone security |
|---|---|---|
| Home mortgage | Lender A holds a first mortgage securing both loans | Lender A holds a first mortgage securing only the $400,000 home loan |
| Investment property mortgage | Lender A holds a first mortgage securing both loans | Lender B holds a first mortgage securing only the $480,000 investment loan |
| Home loan | $400,000, supported by both properties | $400,000, supported by the home |
| Investment loan | $480,000, supported by both properties | $480,000, supported by the investment property |
| Guarantee | None in this example | None in this example |
| Investment property sale | Lender A assesses how sale repayments reduce the $880,000 total debt and what debt the home will support afterwards | Lender B provides its investment-loan payout and release conditions. Lender A’s home mortgage stays in place |
Shared security gives Lender A a mortgage over each property for the combined $880,000 debt. With the standalone structure, each lender’s mortgage supports its stated facility. Keeping both loans at one lender can also be standalone, if the documents genuinely keep the securities separate.
For a real file, identify any redraw available under the limits as well as money already borrowed. A proposed balance reduction can leave an unchanged limit, so the release request must explain both.
Guarantees and All Monies Mortgages
A guarantee adds another person’s promise to meet specified obligations if the borrower fails to pay. A mortgage over that person’s property can secure the guarantee. Identify the guaranteed facility, liability limit and supporting mortgage separately.
The fictional portfolio above has no guarantee. Suppose the borrower’s sibling gives an unsecured guarantee limited to $50,000 for the investment facility only. The guarantee map then runs from the sibling to that facility, while both property mortgages still secure both loans.
This hypothetical guarantee adds no property security and doesn’t reduce the debt in the LVR calculation. A guarantee secured by a mortgage needs a further map of that property and the mortgage’s secured-debt wording.
An all monies mortgage secures the obligations covered by its wording, which can include present and future debts to the lender. Its scope depends on the definition of secured money and any restrictions in the documents. It can operate over one property, so the term alone doesn’t establish a multiple-property structure.
The High Court’s Waller decision describes successive loans secured by the same all monies mortgage. Review the actual clauses with the client’s solicitor before treating an account payout as a complete release of security.
Compare Standalone and Shared Security
Shared security lets a lender assess several properties together, but it also makes a later sale depend on the security and debt left behind. Standalone mortgages keep the stated security allocation separate. They don’t remove the borrower’s repayment obligations or protect other assets from every consequence of default.
In the fictional shared portfolio, the combined loan-to-value ratio (LVR) is 62.9%: $880,000 divided by $1.4 million. LVR measures the debt against the value of its security. The standalone loans instead have LVRs of 50% for the home and 80% for the investment property.
Shared security can support a loan that one property wouldn’t support alone. Decide whether that benefit is needed for the client’s purchase, then compare the costs of adding security and the client’s later plans. A low combined LVR doesn’t promise a particular release amount.
How a Retained Valuation Changes Sale Proceeds
Continue the fictional example and sell the investment property for $600,000. Assume $20,000 in selling and settlement costs, leaving $580,000 before the lender’s payout. Ignore accrued interest and lender charges to make the calculation visible.
For this illustration only, assume Lender A agrees to release the investment property if the remaining home-backed debt is at most 80% LVR. The 80% threshold is an illustrative assumption.
Actual lenders set their own release conditions. The lender must also accept the remaining borrower and loan structure.
| Calculation | Home valued at $800,000 | Home valued at $450,000 |
|---|---|---|
| Maximum retained debt under the assumed 80% condition | $640,000 | $360,000 |
| Total debt before sale | $880,000 | $880,000 |
| Minimum debt reduction under that condition | $240,000 | $520,000 |
| Proposed investment-loan payout | $480,000 | $480,000 |
| Additional home-loan reduction needed after that payout | $0 | $40,000 |
| Total payout in this proposed plan | $480,000 | $520,000 |
| Sale money left after costs and proposed payout | $100,000 | $60,000 |
| Home loan left | $400,000 | $360,000 |
At the higher valuation, paying out the $480,000 investment loan leaves the home loan at 50% LVR. The plan repays more than the minimum $240,000 required by the assumed security test because it closes the investment account.
At the lower valuation, the same $400,000 home loan would sit at 88.9% LVR. The assumed condition requires another $40,000 reduction, so the client’s available sale money falls to $60,000. The investment property still sells above its $480,000 loan balance, but the retained home changes the release calculation.
With the standalone structure, the investment lender’s mortgage doesn’t secure the home loan under the stated assumptions. Paying its $480,000 balance leaves $100,000 after the assumed costs. That comparison depends on the real documents keeping the mortgages and any guarantees separate.
Macquarie’s partial-discharge guidance, as at October 2026, states that properties secure the whole facility. A partial discharge requires credit assessment, and Macquarie can require full net sale proceeds to reduce the debt. Its process demonstrates why the amount released to a client needs lender approval.
Cross Securitisation and Equity Release
In a property-loan discussion, cross securitisation commonly describes shared property security. Equity release is additional borrowing against a property’s value. Borrowing the deposit against the home doesn’t by itself make that home security for the investment property’s loan.
An equity-release facility secured only by the home can fund the investment deposit while a separate facility uses the investment property as security. Trace each mortgage to its debt. Where the investment facility also takes the home as security, the purchase has shared security despite using separate accounts.
Plan a Release or Refinance
Plan a property release by obtaining accepted valuations and written payout conditions before relying on the sale money or replacement finance. A proposed standalone structure is a request for assessment. A confirmed release has the lender’s approval and the documents required to complete it.
Work through this sequence before your client commits to spending the expected proceeds.
- Collect the current facility contracts, mortgage terms and guarantee documents. Match them to title searches and loan statements so every property, debt and guarantee appears in the security map.
- Set out the proposed result. Identify the property being released, accounts being closed and the balances and limits to remain. Include any change to loan purpose or offset-account arrangements.
- Obtain the valuations the lender requires for the remaining security. Recalculate the proposed debt against those values and identify any cash shortfall.
- Submit the partial-release request for assessment. Obtain written conditions specifying the required payout, retained security and any limit reductions. A submitted discharge authority alone isn’t approval.
- If replacement finance is needed, obtain its approval and satisfy its funding conditions before depending on it. Coordinate the outgoing payout, new mortgage and sale through the settlement representatives.
- Accept and return the required variation and discharge documents. Obtain the settlement-date payout, account for accrued interest and charges, then book settlement against the approved arrangement.
- After settlement, verify the remaining account balances and limits. Have the settlement representative confirm the discharged mortgage and any replacement registration. Obtain separate confirmation for each guarantee being released.
Macquarie’s partial-discharge process, as at October 2026, requests the sale price and estimated remaining property values. It also asks for changed financial circumstances and proposed account limits. Formal approval is followed by a Variation Acceptance, then settlement through its solicitor.
A security swap replaces security on a retained loan and needs its own approval. Removing a guarantor requires confirmation that the guarantee and its supporting security are released. Don’t infer either outcome from closing a loan account.
A broker can use Bulma’s Policy Advisor to compare security requirements across 52+ lenders and retain the quoted policy wording in file notes. The existing lender’s written release conditions still determine the discharge arrangement.
If replacement finance is declined, recalculate the sale with the existing lender’s approved payout. Compare a larger repayment from sale proceeds with a borrower-funded reduction, if available. If the arrangement can’t fund settlement, involve the client’s solicitor before changing settlement dates or contractual commitments.
Give your client the confirmed payout and the sale money left after all costs. In the fictional low-valuation plan, those figures are $520,000 and $60,000 before excluded interest and charges. Until the actual lender approves its conditions, label the figures as a proposed plan.
