Loan-to-value is one of the most quietly powerful numbers in a mortgage. It decides the interest rate a borrower is offered, how big a deposit they need, whether they pay mortgage insurance, and — more often than most buyers realise — whether a deal completes at all. For a mortgage advisor it is a daily lever; for a buyers' agent it is the number that explains why a perfectly affordable client can still be blocked at the last hurdle. This guide explains exactly what LTV measures, how to calculate it, why lenders care so much, and how to use it in advice — with a worked example you can adapt to any market.
Loan-to-value is the size of the mortgage as a percentage of the property's value. The formula is simple: LTV = loan amount ÷ property value × 100. Borrow €240,000 against a €300,000 home and the LTV is 80%. The flip side of that ratio is the borrower's equity — the 20% they fund themselves through a deposit. Where borrowing capacity is a property of the person, LTV is where the person and the property meet: it ties the loan to the asset securing it. That is why it sits at the centre of nearly every underwriting decision.
How to calculate LTV correctly
The arithmetic is easy; the detail that trips people up is which value to use. Lenders always calculate against the lower of the purchase price and the appraised value, not whichever number is more convenient. If a buyer agrees €300,000 but the valuation comes back at €290,000, the LTV is measured against €290,000. That single rule is responsible for a large share of last-minute financing problems, because it means an aggressive offer can quietly push a borrower into a higher LTV band than they planned for. Getting an independent read on value before the offer — rather than discovering it at the lender's valuation stage — is the difference between a smooth completion and a scramble for cash.
Why lenders care so much about LTV
LTV is, at heart, a risk gauge. The lower the ratio, the more of the borrower's own money is at stake and the bigger the cushion between the loan and the sale value if the lender ever has to repossess. A loan at 60% LTV could survive a substantial fall in prices before the bank is underwater; a loan at 95% has almost no margin. Lenders price that risk directly into the interest rate, which is why rates step up at recognised LTV thresholds — typically around 60%, 80%, 90% and 95%. Cross a band and the rate, the fees, and sometimes the eligibility all change. In some markets a high LTV also triggers mortgage insurance (or a guarantee scheme), an extra cost the borrower carries until they build enough equity to drop below the threshold.
The LTV bands and what they mean
Exact cut-offs vary by country and lender, but the shape is consistent. Below 60% is the cheapest, lowest-risk tier, usually reserved for buyers with large deposits or remortgagers with built-up equity. 60–80% is the mainstream sweet spot where most movers sit and where the best widely available rates live. 80–90% is normal for buyers stretching their deposit, at a modest rate premium. 90–95% is the typical first-time buyer zone — accessible, but with higher rates and tighter affordability checks. Above 95%, including the occasional 100% product, is high-risk territory available only through specific schemes, guarantor arrangements or particular markets. Knowing exactly which side of a band a client falls on is often worth more than chasing a slightly better headline rate.
A worked example
Take an illustrative buyer purchasing a home for €300,000 with a €60,000 deposit. Their loan is €240,000, so on the agreed price the LTV is 80% — right on the threshold for a competitive rate. Now the lender's valuation comes in at €285,000. Because LTV is measured against the lower figure, the lender will only lend 80% of €285,000 — that is €228,000. The buyer still owes €300,000 to the seller, so they must now find €72,000 in cash instead of €60,000: the original deposit plus a €12,000 shortfall. If the buyer instead wants to keep their loan at €240,000, the LTV against €285,000 jumps to roughly 84%, which may bump them into a higher rate band or fail the lender's criteria entirely. Same buyer, same home, same price — a €15,000 valuation gap reshapes the whole deal. (Figures are illustrative, to show the mechanics; real thresholds and costs depend on the lender and market.) This is exactly why a defensible view of value matters before an offer, not after; our guide on how to value a house walks through building that estimate from comparable sales.
Using LTV in advice
For advisors, LTV is a planning tool, not just a number on the application. A buyer who is a few thousand euros of deposit away from dropping under the next band can often save far more over the life of the loan than that gap costs — a conversation worth having before they commit every spare euro to the purchase price. LTV also pairs with the borrower's borrowing capacity to define the real ceiling: capacity says how much income can support, LTV says how much the property and deposit will allow, and the deal lives inside the lower of the two. And because the deposit, the loan and the one-off buyer's costs all draw on the same savings, modelling them together stops a client from being surprised at completion.
Where the valuation half of LTV comes in
Every LTV figure is only as reliable as the value underneath it, and that is the side professionals can de-risk. This is where Biedradar fits: enter an address and it returns comparable sales, a valuation range and market signals, then generates a branded property-analysis report in minutes — so an advisor or buyers' agent can pressure-test whether a home will value up to the agreed price before the offer is locked in. If the independent range sits below the asking price, you know in advance that the LTV will be calculated against a lower number, and you can either adjust the offer or prepare the client for the extra cash — rather than discovering it when the lender's surveyor reports. The result is fewer deals that collapse at the valuation stage, and a clear, evidenced answer to the question every buyer eventually asks: is this home actually worth what I am about to pay for it? Pair that valuation confidence with the right LTV band and you turn an approval in principle into a completion that holds together.
Frequently asked questions
What is the loan-to-value (LTV) ratio?
Loan-to-value is the size of a mortgage expressed as a percentage of the property's value: loan amount divided by value, times 100. A €240,000 loan on a €300,000 home is an 80% LTV. It tells the lender how much of the purchase is funded by debt versus the borrower's own cash, and it is one of the strongest predictors of how risky a loan is.
How do you calculate LTV?
Divide the loan amount by the lower of the purchase price and the appraised value, then multiply by 100. Lenders always use the lower of the two figures, so if a home is bought for €300,000 but only values at €290,000, the LTV is calculated against €290,000 — which raises the ratio and can change the deal.
What is a good LTV ratio?
Lower is safer and usually cheaper. Below about 80% LTV a borrower typically reaches the best interest rates and avoids mortgage insurance in markets that require it. 90-95% LTV is common for first-time buyers but comes with higher rates and stricter checks. Above 95-100% is high-risk and only available in specific markets or schemes.
Why does LTV affect the interest rate?
A lower LTV means the borrower has more equity, so if the lender ever has to repossess and sell, there is a bigger cushion before they lose money. That lower risk is priced as a lower interest rate. As LTV climbs, the cushion shrinks, the risk rises, and lenders charge more or decline the loan.
What happens if the valuation comes in below the price?
Because LTV is calculated against the lower of price and value, a low valuation pushes the ratio up. The lender lends a percentage of the lower value, not the agreed price, so the buyer must cover the shortfall in cash on top of their deposit — or renegotiate. This is the single most common way a financed deal falls apart late.
