Family guarantor loans — where a parent or family member uses their property equity to guarantee part of a child’s mortgage — fund about 20% of first home purchases in Victoria. Done well, they let buyers enter the market with smaller deposits and avoid Lenders Mortgage Insurance (LMI). Done poorly, they put the guarantor’s home at risk and create family disputes that outlast the property itself.
This guide covers how guarantor loans work, the major variants, the risks to guarantors, and how to structure them to protect both sides.
How a guarantor loan works
The buyer takes a mortgage on the property they’re purchasing. The guarantor offers a portion of equity in their property as additional security. The lender takes a limited mortgage over the guarantor’s property — typically 20% of the buyer’s loan amount.
Example: buyer purchases $700,000 home with $50,000 deposit. Loan needed: $650,000. Without guarantor, this is over 90% LVR and triggers ~$30,000 in LMI. With guarantor providing 20% ($140,000) of equity:
- Buyer’s loan: $650,000 effectively secured against $840,000 ($700,000 property + $140,000 guarantor equity)
- Effective LVR: 77% — under 80% threshold
- No LMI required
- Buyer saves $30,000+ upfront
Three guarantor structures
| Structure | Mechanics | Guarantor risk |
|---|---|---|
| Limited security guarantee | 20% of loan secured against guarantor property | Limited — capped at security amount |
| Full guarantee | Full loan amount guaranteed | High — guarantor liable for whole loan |
| Servicing guarantee | Guarantor income supports buyer’s borrowing capacity | Variable — depends on loan terms |
Limited security guarantees are the safer and more common structure. Full guarantees expose the guarantor to the entire loan — much riskier.
Risks to the guarantor
- Default risk. If the buyer defaults, the lender can call on the guarantor. The guarantor must pay or face their property being sold.
- Reduced borrowing capacity.Guaranteed amount counts against the guarantor’s own borrowing capacity. May prevent the guarantor from accessing equity or refinancing.
- Cannot sell without releasing.Guarantor cannot sell their property without first releasing the guarantee. Requires buyer’s loan to be at lower LVR or alternative security found.
- Death and incapacity. If the guarantor dies or loses capacity, the guarantee continues and creates estate complications.
- Family relationship damage. If the buyer struggles, family conflict over repayments is common.
Independent legal advice — usually mandatory
Most lenders require the guarantor to obtain independent legal advice before signing. The solicitor:
- Explains the guarantee terms in plain English
- Confirms the guarantor understands the risks
- Confirms the guarantor isn’t under undue influence
- Documents the advice with a Statement of Independent Legal Advice
Cost: $400–$1,200. Typically paid by the buyer or split between buyer and guarantor.
Releasing the guarantee
The goal of a guarantor loan should be to release the guarantee as soon as feasible. Mechanisms:
- Property value increase.When the buyer’s property value reaches a level where their LVR (without guarantee) drops below 80%, the lender can release.
- Loan repayment. Buyer pays down enough of the loan that LVR drops below 80% even at original valuation.
- Refinancing. Buyer refinances to a new lender on a standalone basis (with LMI if needed).
- Bank revaluation request. Some lenders allow requesting revaluation periodically. Cost typically $300–$600.
Realistic timeline: 3–7 years for guarantee release in a normal market.
Structures to protect both sides
1. Limited security guarantee with cap
Use a limited (not full) guarantee. Cap the security at a specific dollar amount, not a percentage. This prevents creep if the buyer’s loan is restructured.
2. Buyer commits to repay guarantor
Family loan agreement separately documents the buyer’s obligation to release the guarantor. Includes target dates for revaluation and refinancing.
3. Insurance for guarantor
Some buyers purchase Income Protection Insurance to cover loan repayments if they’re unable to work. This protects both buyer and guarantor.
4. Will and estate planning
Both parties should review their wills. The guarantee must be addressed if either party dies. Buyers should consider life insurance to cover the loan if they die unexpectedly.
Family relationship considerations
Beyond legal structures:
- Discuss expectations explicitly — this is a financial transaction, not just family help
- Document the arrangement in writing — including timeline for release
- Other siblings — consider whether they get equivalent support, or document why not
- If the buyer’s relationship with a partner ends, the guarantor’s position changes — plan for this scenario
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