The valuation and LMI traps that derail refinances

Rate and fees are the easy part of a refinance. The risks that actually stop deals — or make them far more expensive than expected — almost always come down to two things: what your property is worth today, and whether that triggers Lenders Mortgage Insurance.

Your LVR is recalculated from scratch

When you refinance to a new lender, they don't care what your property was worth when you bought it. They value it now, and recalculate your loan-to-value ratio (LVR) — your loan divided by the current valuation. That single number drives everything: your eligibility, your rate, and whether LMI applies.

The magic threshold is 80%. Stay at or below it and you avoid LMI and access the best pricing. Go above it and the economics change quickly.

Risk 1: LMI re-triggering

Lenders Mortgage Insurance protects the lender, not you — and it is not portable. Move to a new lender with a loan above 80% of the current value and you may pay a brand-new premium, even if you already paid LMI on your original loan. On a large loan that can mean thousands of dollars, instantly erasing years of rate saving.

Risk 2: valuation shortfalls

Refinance valuations are often conservative, and different lenders can value the same property quite differently. A valuation that comes in below your estimate can:

• push your LVR over 80% and trigger LMI,
• exceed the lender's maximum LVR and reduce how much you can borrow, or
• stop the refinance in its tracks.

Because the figure varies by lender and method (full inspection, desktop, or automated model), which lender you approach matters — a strong reason to check an indicative position before lodging a formal application.

Risk 3: negative equity

If values have fallen far enough that you owe more than the property is worth, you're in negative equity, and refinancing to a new lender becomes very hard until the balance drops or values recover. In this case, renegotiating with your current lender — who already holds the loan — is usually the more realistic move.

How to navigate it safely

• Know your LVR first. Estimate your current value honestly using recent comparable sales before you do anything else.
• Build the valuation case. Document renovations and improvements, and present the property well.
• Choose the lender strategically. A broker can align you with lenders whose valuations and policies suit your property — avoiding wasted applications and unnecessary credit enquiries.
• Model the LMI scenario. If you're near 80%, know the premium before you commit.