Non Standard Structures and Equity › How does a family security guarantee work?

How does a family security guarantee work?

A family security guarantee, often called a guarantor loan, lets a family member use the equity in their own home as additional security for your loan, so you can buy with little or no deposit and often avoid Lenders Mortgage Insurance. The guarantor takes on a legal obligation for the guaranteed portion, so independent legal advice is essential. Lender policies on guarantees vary.

Ross McFarlaneWritten by Ross McFarlane, Licensed Mortgage Broker (Credit Representative 526725). About the author

A family security guarantee is one of the most powerful tools for getting into the market without a large deposit, and one of the most serious, because it puts a family member home on the line. Here is how it works and what everyone involved should understand.

How the guarantee works

In a family security guarantee, a family member, usually a parent, offers part of the equity in their own home as additional security for your loan. This lifts your total security to the equivalent of a larger deposit, so you can borrow with a smaller deposit of your own, and often without paying Lenders Mortgage Insurance.

It is a limited guarantee

The guarantee is usually limited to a defined portion of the loan, rather than the whole debt. The guarantor secures that portion against their property, which is what allows you to bridge the deposit gap. The structure and the size of the guaranteed portion are set within the lender policy.

The big advantage

The main advantage is getting into the market sooner, without waiting years to save a full deposit, and often avoiding the Lenders Mortgage Insurance premium. For a buyer who can comfortably service the loan but cannot quickly save the deposit, this can bring home ownership forward significantly.

The guarantor takes on real risk

The central point is that the guarantor is legally responsible for the guaranteed portion. If you cannot repay, the lender can call on the guarantor, and in the worst case their property is at risk. It can also affect the guarantor own borrowing capacity. This is a serious commitment, not a formality.

Independent legal advice is essential

Lenders generally require, and it is strongly advisable, that the guarantor obtains independent legal advice before signing, so they fully understand the obligation and are not pressured. This protects the guarantor and is a step that should never be skipped.

The guarantee can usually be released

A guarantee is not necessarily permanent. Once you have built enough equity, through repayments and any value growth, so that your loan to value ratio reaches a level the lender accepts, the guarantee can often be released and the guarantor security removed. A clear path to release is part of a sensible arrangement.

Lender policies vary

How lenders structure family guarantees, what they require of the guarantor, and the conditions for release all vary between lenders. So the right lender for a guarantee arrangement depends on both your situation and the guarantor circumstances, which is where guidance helps.

Plan it openly

Because a guarantee involves two parties and a real obligation, it should be planned carefully and openly. A broker can explain the structure, what the guarantor is committing to, and the path to release, usually at no cost to you, and the guarantor should obtain independent legal advice. This is general information, not advice.

In our experienceFamily guarantees work best when everyone goes in with eyes open: a borrower who can clearly service the loan, a guarantor who fully understands the risk and has had independent advice, and a clear plan to release the guarantee once equity builds.
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Frequently asked questions

How does a family guarantee help me buy?▾

A family member uses equity in their own home as additional security for your loan, lifting your total security so you can buy with a smaller deposit and often avoid Lenders Mortgage Insurance. The guarantee is usually limited to a defined portion.

What is the risk to the guarantor?▾

The guarantor is legally responsible for the guaranteed portion. If you cannot repay, the lender can call on them, and in the worst case their property is at risk. It can also affect their own borrowing capacity.

Can the guarantee be removed later?▾

Usually yes. Once you build enough equity so your loan to value ratio reaches a level the lender accepts, the guarantee can often be released and the guarantor security removed.

Last reviewed: June 2026

General information only. This page provides general information about home loans and is not financial or credit advice, a quote, or a guarantee, and your personal circumstances have not been considered. Lending policies, interest rates, fees and eligibility vary by lender and change over time. Always confirm your own situation with a licensed mortgage broker or lender before acting. Ross McFarlane (Credit Representative 526725) is an authorised Credit Representative of Australian Associated Advisers Pty Ltd t/a Keylend, Australian Credit Licence 392169.