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Family guarantee vs paying LMI is the decision most Sydney first home buyers with helpful parents end up making, and it is usually framed as a cost comparison. It is not only that.
One route costs money. The other transfers risk onto someone else’s balance sheet. Those are different kinds of decision and comparing them on dollars alone misses what is actually being traded.
Family guarantee vs paying LMI is a choice between two solutions to the same problem: a deposit below twenty per cent of the purchase price.
Paying the premium means the lender insures the portion of the loan above its comfort level and charges you for it. The cost is a one-off amount, usually capitalised onto the loan, and nobody else is involved.
A family guarantee means a parent offers security over their own property for part of your loan, so no insurance premium is charged. No premium is paid, your parents may incur legal costs, and they take on an obligation.
A third route sits outside family guarantee vs paying LMI altogether and is worth naming: the government deposit scheme removes the premium for eligible buyers at five per cent with no family involvement at all. Check that first. See first home buyer lending.
An honest comparison of family guarantee vs paying LMI runs across several dimensions rather than one.
| Paying the premium | Family guarantee | |
|---|---|---|
| What it costs you | A one-off premium, commonly capitalised onto the loan and paid off with interest over the term | Nothing directly. Your parents may incur legal costs |
| Who carries risk | Only you | You and your parents, to the limit stated in the guarantee |
| Lender choice | Wide, since insured lending is offered across most of the market | Narrower, since not every lender offers family guarantee structures |
| Speed and complexity | Simpler. One borrower, one property | More moving parts, and your parents need independent legal advice |
| How it ends | Nothing to end. The premium is paid and done | Released on application once your own property supports the loan |
| If things go wrong | Your problem alone | Your parents’ property is exposed to the guaranteed portion |
Which of those rows matters most is a family question rather than a financial one, and it is not ours to answer. See what a premium actually costs.
In family guarantee vs paying LMI this is the part that deserves the most attention and usually gets the least. A limited guarantee caps the exposure at a stated amount rather than the whole loan, and that figure should be in the document.
If a guarantee is not limited, ask why before anyone signs. An unlimited guarantee exposes the guarantor to the entire debt.
A guarantee can also affect the guarantor’s own borrowing, because the commitment is disclosed on their future applications. Parents planning to borrow themselves should raise that at the start.
Most lenders require guarantors to obtain independent legal advice, and those that only recommend it still allow time for it. The guarantee document sets out exactly what has been agreed, and it should be read with a lawyer rather than summarised by anyone else, including us.
The guarantee side of family guarantee vs paying LMI has an end point, which the premium side does not.
A limited guarantee becomes eligible for release once your own property carries enough value to support the loan without it, which commonly means the loan reaching eighty per cent of your property’s value.
Two things get it there at the same time: repayments reducing the balance, and any growth in the property’s value. In a flat or softening market the first does the work alone.
Release is not automatic when the threshold is reached. It has to be applied for, the lender will want a current valuation, and the application is assessed on your own capacity at that time.
That last point matters at the start. If your income has fallen by then, the guarantee may need to stay in place longer than the arithmetic suggests.
Family guarantee vs paying LMI is easier to weigh once the premium has an actual figure attached rather than a vague sense of being expensive.
The premium is driven by two things: the size of the loan and how far above eighty per cent of value you are borrowing. It rises sharply as the deposit shrinks, which is why five per cent and fifteen per cent are very different propositions.
It is usually capitalised onto the loan rather than paid up front, which means you pay interest on it across the term. That makes the true cost higher than the quoted premium.
Against that, a family guarantee has no premium at all, though your parents may incur their own legal costs for the independent advice the lender requires.
Ask for the premium quote at your actual deposit level before deciding family guarantee vs paying LMI either way. It is a figure the lender can give you. See what a premium actually costs and the deposit calculator.
Family guarantee vs paying LMI is easier to resolve with five questions than with a spreadsheet.
Do you qualify for the government deposit scheme, which would remove the premium without involving anyone else? Have your parents taken independent legal advice and understood the limit?
Do your parents have borrowing plans of their own in the next few years? How long is the guarantee likely to run, on repayments alone with no price growth assumed?
And would the relationship survive a period where you could not meet the repayments? That is not a financial question and it is the one most worth answering honestly.
We will set out both routes with figures and say what each requires. Which one suits your family is yours to decide. Call +61 447 959 546 or see family guarantee lending.
They trade different things, so neither is better in the abstract. Paying the premium costs money and involves nobody else. A guarantee costs nothing directly and puts a parent’s property behind part of your loan.
Which matters more is a family decision rather than a financial calculation, and it is worth making deliberately rather than by default.
A parent offers security over their own property for a stated portion of your loan, which brings the insured part of the lending back inside the lender’s comfort level so no premium is charged.
The guarantee is usually limited to an amount rather than the whole loan, and it is released on application once your own property supports the loan.
The guaranteed portion of the debt can be enforced against their property if you cannot pay. A limited guarantee caps that at a stated amount, which should be in the document; an unlimited one does not.
It can also affect their own future borrowing, because the commitment is disclosed on their applications. Independent legal advice is required and is worth taking seriously.
Yes, by applying for release once your own property supports the loan without it, commonly at eighty per cent of its value. Repayments and any price growth both work toward that.
Release is not automatic at the threshold: it has to be applied for, a current valuation is usually required, and your capacity is reassessed at that time.
For eligible first home buyers, yes. The government deposit scheme removes the premium at a five per cent deposit without any family involvement, and places are now unlimited rather than rationed. A twenty per cent deposit does the same thing.
Some lenders also waive the premium for particular occupations, usually up to a set lending ratio rather than at a five per cent deposit. All three are worth checking before this comparison.
Almost always. Most lenders require guarantors to obtain independent legal advice, and those that only recommend it still have to allow time for it, because a guarantee is a significant legal commitment rather than a formality.
The guarantee document states what has actually been agreed, including the limit and how release works, and it should be read with their own lawyer rather than summarised by a broker or a lender.
What going guarantor involves, and the questions a guarantor should ask, are set out by ASIC Moneysmart. Guarantee structures and release criteria are set by individual lenders and change without notice.
Paritosh Wadhwani | Director and Principal Broker, APW Finance
Member of the Finance Brokers Association of Australia (FBAA). Arranging residential, commercial and specialist lending for Sydney clients across a panel of more than 50 lenders.
APW Finance Pty Ltd, 304/20a Lexington Drive, Bella Vista NSW 2153. Email: info@apwfinance.com. Phone: +61 447 959 546.
ACN 620 646 479 | ABN 79 620 646 479
This guide is general information only. It does not take into account your objectives, financial situation or needs, and it is not financial or credit advice. Lending criteria, interest rates, duty thresholds and government schemes change, and every application is subject to lender approval.
Consider whether this information suits your circumstances and seek independent advice before acting. Figures quoted are current at the date below and should be confirmed before you rely on them. Last reviewed: October 2026.
APW Finance Pty Ltd delivers expert lending solutions with personalised service, empowering clients across residential, commercial, and business sectors.