The Real Cost of a 95% Mortgage vs Waiting to Save a Bigger Deposit

With 95% mortgages now permanently available through the Mortgage Guarantee Scheme, first-time buyers face a genuine choice: buy now with a smaller deposit, or keep saving toward a bigger one. Here’s how to actually weigh the trade-off.

Why a 95% mortgage costs more, specifically

• Higher interest rate than the same lender would typically offer at 90% or 85% loan-to-value, since the lender’s risk is greater with a smaller deposit cushion.
• Larger loan amount in absolute terms (since you’re borrowing a bigger share of the purchase price), meaning more of your monthly payment is going toward interest overall.
• Combined effect: both a higher rate and a larger loan amount push up the monthly payment more than either factor alone might suggest.

The case for buying now with 5% down

• You start building equity immediately, rather than continuing to pay rent that builds no ownership stake at all.
• You’re protected from further house price rises while you save - if prices rise faster than your savings rate, waiting can mean needing an even bigger deposit for the same type of property, a real risk given UK house prices have generally trended upward over time despite periods of stagnation.
• You stop paying rent, which, at a current UK average of £1,383 a month, is itself a substantial ongoing cost with no equity benefit.

The case for waiting and saving more

• A meaningfully better interest rate at 90% or lower loan-to-value, which can outweigh several years of continued saving once the total cost over the mortgage term is calculated.
• Lower monthly payments, both from the better rate and smaller loan amount, giving more day-to-day financial flexibility.
• More lender choice, since not every lender offers 95% deals, and those that do sometimes have stricter criteria at that tier specifically.

A way to actually compare the two paths

Rather than treating this as an emotional decision, it’s worth modelling both scenarios concretely: estimate the total interest paid over, say, five years under a 95% mortgage taken out now, versus the total rent paid over the same period while saving toward a 10% deposit, plus the total interest on the resulting smaller, better-rate mortgage - remembering that Stamp Duty Land Tax is a fixed cost either way, payable whenever you actually buy, so it doesn’t change the comparison between the two paths themselves. Whether waiting is worthwhile depends heavily on your specific rent, savings rate, and the gap between 95% and 90% rates at the time - there’s no universal answer, and the honest calculation sometimes favours each path depending on individual circumstances.

The house price risk cuts both ways

If house prices rise while you’re saving for a bigger deposit, you may need to save even more to reach the same percentage on a now-more-expensive property - effectively a moving target. But if prices fall or stagnate, waiting costs you nothing extra on this front, and you’d have saved a bigger deposit at no penalty. This uncertainty is genuinely unpredictable and worth acknowledging rather than assuming prices will definitely rise (or definitely stay flat) over your specific saving timeline.

A middle path: saving specifically toward 10%

Rather than an all-or-nothing choice between 5% now and a full 20% eventually, many buyers find saving toward a 10% deposit - a meaningful, often achievable step up from the 5% minimum, which frequently unlocks a noticeably better rate tier - a reasonable compromise between buying sooner and avoiding the highest-cost tier of mortgage lending.

The bottom line

There’s no universally correct answer between buying now at 95% or waiting to save more - it depends on your specific rent, savings rate, local house price trends, and how much a better rate at 90% would actually save you given your realistic saving timeline. Running the actual numbers for your specific situation, rather than relying on a general rule of thumb, is the only way to answer this properly for yourself.