LMI: You Pay the Premium, the Lender Gets the Protection

LMI protects the lender, not the borrower

Despite appearing on the borrower's side of the settlement ledger, lenders mortgage insurance is the lender's policy. It exists to cover the lender against loss if the borrower defaults and the property does not repay the debt.

It is not insurance for you. It does not cover your repayments if your income stops, and it does not protect your deposit, your equity or your credit record. Understanding that one asymmetry — you pay, they're covered — is the starting point for every decision that involves it.

When LMI applies: the 80% LVR threshold

LVR — loan-to-value ratio — is the loan amount as a percentage of the property's value. Borrow up to 80% of the value and LMI generally stays out of the picture. Borrow above 80% and lenders will typically require it. In deposit terms, a 20% deposit keeps you at or under the line; anything thinner puts you over it.

Plintha's default modelling assumes an 80% LVR, so LMI does not appear in a standard analysis. Raise the LVR in Advanced and the model adds LMI automatically — the cost of the thinner deposit shows up in the numbers rather than being quietly ignored.

Capitalising the premium into the loan

Most lenders allow the LMI premium to be capitalised — added to the loan balance rather than paid in cash at settlement. That preserves your deposit for the purchase itself, which is usually the whole point of borrowing above 80% in the first place.

Two consequences follow from plain arithmetic. Interest accrues on the premium for as long as it sits in the balance, and the loan becomes slightly larger relative to the property's value. Capitalising is convenient, but it converts a one-off cost into a long-lived one.

The five-year borrowing-cost deduction

For an investment property, the LMI premium is deductible as a borrowing cost — spread over five years, or over the loan term if that is shorter. It cannot be claimed in a single hit; the deduction arrives a portion at a time across those years.

That places LMI in a different tax category from stamp duty, which is a capital acquisition cost: not annually deductible, but added to the CGT cost base instead. Two upfront costs on the same settlement statement, two entirely different tax treatments — worth keeping straight before assuming everything you paid at purchase reduces this year's taxable income.

The deposit trade-off, and how to model it

LMI is best read as the price of entering with a smaller deposit. Paying it means carrying a larger loan, the premium itself, and interest on both. Avoiding it means saving longer for a 20% deposit. Which path costs more depends on factors nobody can reliably forecast — which is precisely why the honest approach is to model the deal as it actually stands rather than guess.

When you run a property through Plintha at an LVR above 80%, the analysis reflects the full weight of the thinner deposit:

• —LMI is added to the model automatically, and every figure in the report carries provenance — computed, [ESTIMATE] with the assumption shown, or [ASSUMED] with the default you can override.
• —Loan defaults — interest-only at 6.5% p.a. over a 30-year term — are all adjustable in Advanced to match your actual quote.
• —Every analysis is stress-tested: interest rates up 2%, extended vacancy, and the interest-only period expiring into principal-and-interest — the scenarios that bite hardest on a larger loan.
• —The free tier includes one analysis per month, no card required.

Common questions