How much deposit do you need for a mortgage in the UK?
Most buyers need to contribute part of the property price themselves. In the UK, many mainstream mortgage options start around a 5% to 10% deposit, but the right target depends on affordability, product availability and the wider costs of buying.
MoneyHelper says buyers usually need at least 5% to 10% of the property price as a deposit. A larger deposit reduces the loan-to-value ratio and can unlock a wider range of mortgage deals or better pricing. Do not put every pound into the deposit and leave nothing for fees, moving costs or emergencies.
Deposit percentage and loan-to-value are two sides of the same calculation
If you buy a £300,000 home with £30,000 of your own money, the deposit is 10% and the mortgage is £270,000, giving a 90% loan-to-value ratio. Lenders use LTV bands when pricing risk. In general, a lower LTV gives the lender more protection if property values fall and can qualify the borrower for more competitive products.
A 5% deposit therefore does not mean the same mortgage pricing as a 20% deposit. Product availability also changes over time. Use current lender or broker information rather than assuming a percentage quoted several years ago is still the practical market minimum.
A bigger deposit can reduce more than the monthly payment
Borrowing less obviously reduces the loan amount, but crossing an LTV threshold can also change the interest rate offered. That means an extra few thousand pounds can sometimes have a disproportionate effect if it moves the application into a better pricing band. The exact bands vary by lender and product.
Do the comparison before committing all savings. A slightly larger deposit may improve the deal, but an empty emergency fund can leave a new homeowner vulnerable to repairs, furniture costs or an income shock. The cheapest mortgage on paper is not useful if the household has no cash buffer after completion.
Budget for costs that are not part of the deposit
Legal fees, surveys, removals, mortgage product fees, valuation costs and property taxes can require cash in addition to the deposit. First-time-buyer tax rules vary across the UK’s nations, so do not build a national budget from an England-only calculator. Ask for a complete transaction-cost estimate early.
If a product fee can be added to the mortgage, remember that you may then pay interest on that fee for years. Compare total cost over the period you expect to keep the deal rather than looking only at the headline rate.
Low-deposit mortgages need a stronger affordability buffer
A small deposit means higher leverage. If property values fall, the owner has less equity and can be more exposed to negative equity. That matters particularly if you may need to sell or remortgage soon. A long time horizon reduces some practical pressure, but it does not eliminate the risk.
Stress-test the monthly payment against a higher future rate and ordinary household shocks. The lender will perform its own affordability assessment, but approval is not the same as comfort. Your personal budget should include council tax, utilities, insurance, maintenance and commuting as well as the mortgage payment.
A larger deposit changes more than the amount you need to save
Mortgage pricing is closely linked to loan-to-value, or LTV: the mortgage amount divided by the property value. A 10% deposit on a £250,000 property means borrowing £225,000 at 90% LTV. Adding more deposit can move the application into a lower LTV band where a lender offers a different rate or fee structure. The next useful target is therefore not always “save as much as possible”; it can be “reach the next pricing band while keeping enough cash for the rest of the purchase.”
Do not use every pound for the deposit. Buyers can also face legal fees, surveys, removals, mortgage product fees, valuation costs and property taxes depending on their circumstances and location. After completion, a home can immediately need repairs or furnishing. An emergency reserve helps prevent the first boiler problem from turning into expensive unsecured borrowing.
The minimum deposit advertised by a lender is not a guarantee of acceptance. Affordability, income, credit history, property type and lender criteria still apply, and some properties or borrower situations can require a lower LTV. An independent broker can be useful when the case is unusual, but always understand how the broker is paid and what range of lenders they can consider.
Gifted deposits need their own planning. Lenders commonly want to know where deposit money came from and may require confirmation that a family contribution is a genuine gift rather than an undisclosed loan. Conveyancers also carry out source-of-funds checks. If relatives will help, tell the broker and solicitor early so documents can be prepared before exchange rather than becoming a last-minute obstacle.
Sources and verification
Isabelle Reed — Personal Finance Writer
I would not turn “5% deposit available” into “5% deposit is optimal”. The minimum that opens the door to a mortgage and the amount that creates a resilient household are different questions. A larger deposit can improve both the loan amount and the LTV pricing band, but I also dislike seeing buyers empty every savings account to reach the next threshold. Homes produce costs immediately: surveys, legal work, moving, repairs and sometimes a surprisingly expensive first month of bills. Keep a buffer. When comparing deposit sizes, ask the broker or lender for actual illustrations at two or three LTV points rather than assuming the rate improvement is linear. Then compare the total monthly commitment with your real household budget. A mortgage approval is the lender’s risk decision; it is not a guarantee that the payment will feel comfortable after childcare, travel, maintenance and other life costs. The best deposit is one that produces a sustainable mortgage without leaving the buyer financially brittle. I would set two savings targets: the deposit needed for a realistic mortgage band and a separate completion/emergency pot. Buyers often focus so intensely on the percentage that they arrive at completion with no resilience. Reaching 90% or 85% LTV can matter, but so does being able to own the property without immediately relying on credit.
MyBankAnswers uses official provider and UK regulatory sources wherever practical. Information is general and does not constitute financial advice.