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Mortgage LTV and deposits explained: the number that prices your loan
Loan-to-value decoded: why the same house costs different people different rates, where the prici
Two buyers, same house, same income — different interest rates. The reason is usually one number: loan-to-value. Understanding LTV is understanding why deposit size is not just "more is better" but a series of specific pricing cliffs.
What LTV actually is
LTV is the loan divided by the property's value, as a percentage. A $270,000 mortgage on a $300,000 home is 90% LTV — the deposit is the remaining 10%. Lenders price by LTV bands because it measures their exposure: if you default and house prices have fallen 5%, a 95% LTV loan is underwater and the lender loses money, while a 60% LTV loan still has a thick cushion. The lower your LTV, the safer the loan, the cheaper the rate — mechanically, not punitively.
The cliffs that matter
LTV pricing is not smooth; it steps. The most important step in most tier-1 markets sits around 80%: above it (deposit under 20%), lenders typically require mortgage insurance or price the risk sharply higher, because they are exposed to loss from the first dollar of price decline. Smaller cliffs appear at 90% and 75%. This is why "just a bit more deposit" can be worth far more than it looks — crossing from 82% to 79% can cut the rate on the whole loan, saving more per year than the extra deposit cost to save. The deposit guide makes the saving plan; this is the reason it matters.
The honest complications
Three things blur the clean picture. Valuations move: LTV is recalculated on the lender's valuation, not your agreed price — a down-valuation raises your LTV on the same deposit. Equity works in reverse too: years of payments (and any price rise) lower your LTV, which is the economic core of remortgaging — re-pricing the loan at the safer band you have earned. And a bigger deposit is not always optimal: money sunk into a low-LTV discount earns the rate saving, but if that same money cleared higher-interest debt first, the maths can favour the smaller deposit — the same ranking logic as the good-versus-bad-debt guide.
The honest summary: LTV is the lender's risk gauge and your price lever. Know the cliffs in your market — especially the big one near 80% — aim your deposit at the nearest cliff rather than a round number, and remember that every payment you make is quietly improving the number that sets your next rate.
Sources and further reading
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