Loan-to-value bands are where mortgage pricing actually jumps

Most explanations of loan-to-value thresholds stop at the point where it starts to matter. This one carries on.

Pricing is banded, not continuous

Lenders publish rates for ranges of loan-to-value, commonly in steps of five or ten percentage points. Within a band the rate is the same, so an extra amount of deposit that does not cross a threshold changes nothing.

Crossing a threshold can change the rate meaningfully, and the effect persists for the whole fixed period. This means the value of additional deposit is lumpy rather than proportional, which is not intuitive.

Finding the nearest threshold

Work out your current loan-to-value, then calculate how much more deposit would cross the next band boundary. If the gap is small, finding that amount can be one of the highest-return short-term financial decisions available.

For most households, if the gap is large, the effort is better spent elsewhere, since being partway between bands has no pricing benefit. The bands used differ between lenders, so it is worth checking several before concluding.

Valuation, not price, decides the band

The lender uses its own valuation, which can differ from the agreed purchase price, and the loan-to-value is calculated against the lower figure. A valuation below the purchase price therefore raises your loan-to-value and can push you into a worse band or reduce the loan offered.

This is why a down-valuation can require additional deposit at short notice. The valuation methodology and any right to challenge it vary by lender and by country.

The band moves under you over time

As capital is repaid and, if prices rise, as the property becomes more valuable, loan-to-value falls and cheaper bands become available at remortgage. Borrowers frequently remortgage onto the same band they started in without checking whether they now qualify for a better one. Calculating current loan-to-value before a remortgage takes minutes and can change the rate available.

If prices fall, the movement reverses, and a borrower can find themselves in a worse band than at purchase.

High loan-to-value carries more than a higher rate

Above certain thresholds, some markets require mortgage insurance paid by the borrower to protect the lender, which is an additional cost. Product choice narrows at high loan-to-value, and some lenders withdraw from the highest bands entirely during downturns.

The risk of negative equity is concentrated there, since a small price fall exceeds a small deposit. None of this makes high loan-to-value borrowing wrong; it makes it more expensive and less flexible, which should be priced into the decision.

Rates, thresholds and rules differ by country and change often — check current figures before acting.

Deposit is not the only affordability constraint

Lenders also apply income multiples and affordability stress tests, and either can bind before the deposit does. Adding deposit does not help if the constraint is income, and increasing income does not help if the constraint is deposit.

Establishing which one binds first tells you where effort produces a result. Rules, insurance requirements and stress-test conventions differ substantially by country and change with regulation.

The takeaway

Calculate your loan-to-value and find the next threshold. Deposit is worth most in the amount that crosses a line.

Write the number down before you decide. It usually decides for you.