Key Takeaways
- The potential saving equals the LMI premium you would otherwise pay, which is driven mainly by your loan amount and your loan-to-value ratio.
- The premium rises steeply as your deposit shrinks, so the saving is largest at a high loan amount with a small deposit.
- You can estimate it with an online LMI calculator or as a rough percentage of the loan, but only the insurer sets the exact figure.
- Treat the estimate as one input in your decision, alongside the higher leverage a smaller deposit involves.
Accountants are comfortable with numbers, so it makes sense to want a figure for what a Lenders Mortgage Insurance waiver could actually save before committing to a purchase. With variable rates around the 6% mark and the premium often running into tens of thousands of dollars, a reasonable estimate helps you plan your deposit, your buffer, and your timing rather than guessing. You cannot calculate the exact premium yourself, because only the insurer sets that, but you can ballpark it well enough to make a sound decision, and this is how.
Turning a rough estimate into a precise figure for your purchase is something a mortgage broker for accountants can do once your numbers are known. This article explains what drives the size of the saving, how to estimate it yourself, why it is only ever an approximation, and what to do with the figure once you have it.
What Determines the Size of Your Saving
Before estimating anything, it helps to know what the premium responds to, because your saving is simply the premium you avoid. Two inputs do most of the work. Lenders Mortgage Insurance (LMI) is charged when you borrow more than 80% of a property’s value, and the premium scales with both your loan amount and your loan-to-value ratio (LVR). A larger loan lifts it, and a smaller deposit lifts it more sharply still, because the premium rises faster the closer you get to 90% or 95%. So your potential saving is largest precisely where the premium would have been largest: a high loan amount combined with a small deposit.
How to Estimate Your Saving
You do not need the insurer’s exact figure to get a useful estimate; a couple of straightforward methods will get you close enough to plan. Each suits a different level of precision.
Use an Online LMI Calculator
The simplest approach is a Lenders Mortgage Insurance calculator, which most lender and comparison websites provide. Entering your property value and deposit returns an estimated premium for that scenario, and since the waiver removes it entirely, that figure is your estimated saving. It is the quickest way to get a realistic number for your specific purchase.
Apply a Rough Percentage
If you want a quick mental estimate, the premium on a higher-LVR loan often falls within a broad band of roughly 2% to 4% of the loan amount, rising as the LVR increases. Applying that to your expected loan gives a ballpark figure, though it is rougher than a calculator and should be treated as an order of magnitude rather than a quote.
Compare Across Deposit Levels
It is also worth estimating the saving at more than one deposit level, for example at both a 10% and a 5% deposit, since the premium and therefore the saving change noticeably between them. Seeing the figures side by side shows you how much the saving grows as the deposit shrinks, which informs the deposit decision itself.
Why It’s Only Ever an Estimate
It is important to be clear that any figure you produce is an approximation, because the actual premium is not something you control. A few factors explain the gap.
The exact premium is calculated by the lender’s mortgage insurer at the time of application, and it varies by insurer, lender, loan amount, LVR, and your individual circumstances. Two borrowers buying the same property with the same deposit can be quoted different premiums through different lenders. So while a calculator or a percentage gets you a realistic range, the precise saving is only confirmed once a specific lender and insurer assess your application. Treating your estimate as a guide rather than a guarantee keeps your planning honest.
What to Do With the Figure
An estimate is only useful if it informs a decision, so it is worth being deliberate about how you use it. The number sits within a broader picture.
Use the estimate to weigh whether the waiver is worth using for your situation, remembering that avoiding the premium usually means buying with a smaller deposit and therefore borrowing more. The loan is still assessed at the actual rate plus a buffer of 3 percentage points set by the Australian Prudential Regulation Authority (APRA), which at current rates means roughly 9%, so a larger loan needs more borrowing capacity to service. The saving is genuine and often substantial, but it is one input alongside your deposit position, your comfort with leverage, and the other costs of buying. Used that way, the estimate helps you plan rather than simply impress.
Frequently Asked Questions (FAQs)
How do I estimate my LMI saving as an accountant?
Your saving equals the premium you would otherwise pay, so estimate the premium for your property value and deposit using an online LMI calculator, or apply a rough percentage of the loan amount. Because the waiver removes the premium entirely, that estimated premium is your estimated saving. The exact figure is confirmed by the insurer at application.
What drives how much I save?
Mainly your loan amount and your LVR. The premium rises with the size of the loan and climbs more steeply as your deposit shrinks toward 90% or 95%, so the saving is largest at a high loan amount with a small deposit. A larger deposit means a smaller premium and therefore a smaller saving.
How accurate is an online LMI calculator?
It gives a realistic estimate for your scenario, but not an exact quote. The actual premium is set by the lender’s mortgage insurer and varies by insurer, lender, and your circumstances, so two lenders can produce different figures for the same purchase. Use the calculator result as a planning guide rather than a guarantee.
Should I estimate the saving at different deposit levels?
Yes, it is useful. Estimating at both a 10% and a 5% deposit shows how much the premium, and therefore the saving, changes between them. This helps you see the effect of a smaller deposit and informs the trade-off between saving more and buying sooner with the waiver.
Does the saving change how much I can borrow?
No. The waiver removes the premium but does not affect your borrowing capacity, which the lender assesses at the actual rate plus a 3 percentage point buffer. So the estimate tells you what you avoid in cost, not what you can borrow, which is driven by your income, expenses, and commitments.
Is the estimated saving the only thing I should consider?
No. The saving is significant, but using the waiver usually means a smaller deposit and a larger loan, so weigh the estimate against the higher leverage, your borrowing capacity, and the other upfront costs of buying. The figure is one input in the decision rather than the whole of it.
The Bottom Line
An accountant can estimate a potential LMI saving by working out the premium they would otherwise pay, since the waiver removes it entirely; the figure is driven mainly by the loan amount and the LVR, and rises steeply as the deposit shrinks. An online LMI calculator gives the most realistic estimate, while a rough percentage of the loan offers a quick ballpark, but only the insurer sets the exact premium at application. Used well, the estimate helps you plan your deposit and timing, provided you weigh it against the higher leverage a smaller deposit involves and the lender’s assessment at the actual rate plus 3 percentage points.