Essential Guide to Mortgage Deposits: What You Need to Know

The mortgage deposit is often the single biggest financial challenge facing homebuyers in the UK. Whether you are a first-time buyer saving from scratch or someone looking to move to a larger property, understanding how deposits work — and how to build one efficiently — can save you thousands of pounds over the life of your mortgage.

In this guide, we cover everything you need to know about mortgage deposits, from minimum requirements to advanced strategies for building your deposit faster.

What is a mortgage deposit?

A mortgage deposit is the amount of money you put towards the purchase price of a property from your own funds. The remainder is covered by the mortgage loan from your lender. The deposit is expressed as a percentage of the property’s purchase price.

For example, if you are buying a property worth £250,000 and you have £25,000 saved, your deposit is 10%. The mortgage would cover the remaining 90%, which is referred to as a 90% loan-to-value (LTV) ratio.

The deposit serves two purposes. First, it reduces the amount you need to borrow, lowering your monthly payments and the total interest you pay over the mortgage term. Second, it provides the lender with a financial cushion — if property values fall, the deposit ensures there is equity in the property to protect the lender’s investment.

Minimum deposit requirements in the UK

The minimum deposit for a residential mortgage in the UK is typically 5% of the property’s purchase price. This means:

Property price	5% deposit	10% deposit	15% deposit	20% deposit
£150,000	£7,500	£15,000	£22,500	£30,000
£200,000	£10,000	£20,000	£30,000	£40,000
£250,000	£12,500	£25,000	£37,500	£50,000
£300,000	£15,000	£30,000	£45,000	£60,000
£350,000	£17,500	£35,000	£52,500	£70,000

While 5% is the minimum for most lenders, some specialist products allow even lower deposits. For example, family springboard mortgages and certain guarantor mortgage products can allow you to buy with no personal deposit at all, provided a family member supports the application.

It is worth noting that buy-to-let mortgages typically require a minimum deposit of 25%, and some specialist mortgage types have different requirements.

How deposit size affects your mortgage rate

One of the most important things to understand about mortgage deposits is that the more you put down, the better the interest rates available to you. Lenders price their products in LTV bands, and each step down brings a noticeable improvement in rates.

The typical LTV bands and their implications are:

• 95% LTV (5% deposit) — the highest rates; fewest lender options. Still a viable route onto the ladder, but monthly payments and total interest will be at their highest
• 90% LTV (10% deposit) — a noticeable improvement in rates compared to 95%. Many more lenders and products become available at this level
• 85% LTV (15% deposit) — rates improve further, and you are now in the comfort zone for most mainstream lenders
• 80% LTV (20% deposit) — often considered the sweet spot. Rates are very competitive, and you have a strong equity position from day one
• 75% LTV (25% deposit) — excellent rates available. This is also the minimum typically required for buy-to-let mortgages
• 60% LTV (40% deposit) — the best rates on the market are usually reserved for this level and below

The difference in interest rates between a 95% LTV and a 75% LTV mortgage can be 0.5% to 1.5% or more, which translates to significant savings over the mortgage term. Use our mortgage calculator to compare the monthly costs at different deposit levels.

Example:

On a £200,000 mortgage over 25 years:

• At 5.5% interest (95% LTV): monthly payment of approximately £1,228
• At 4.5% interest (75% LTV): monthly payment of approximately £1,112

That is a saving of £116 per month, or nearly £35,000 over the 25-year term — and that is before accounting for the fact that you also borrowed £40,000 less with the larger deposit.

How to save for a mortgage deposit

Saving for a deposit requires discipline and planning, but there are several strategies that can help you reach your goal faster.

Set a clear target and timeline:

Work out exactly how much you need to save and by when. Use our affordability calculator to determine what you can realistically borrow, and work backwards to calculate the deposit required.

Open a Lifetime ISA:

If you are a first-time buyer aged 18 to 39, a Lifetime ISA offers a 25% government bonus on savings of up to £4,000 per year. That is up to £1,000 per year in free money. Over four years of maximum contributions, you would have £20,000 — of which £4,000 is a government bonus. The property must cost £450,000 or less to use LISA savings for a purchase.

Automate your savings:

Set up a standing order on payday to transfer a fixed amount into a dedicated savings account. Treating your deposit savings like a bill — something that comes out before you spend on anything else — is one of the most effective strategies.

Review your spending:

Track your spending for a month and identify areas where you can cut back. Common savings include:

• Unused or underused subscriptions (streaming, gym, apps)
• Eating out and takeaways
• Expensive phone contracts (consider SIM-only deals)
• Non-essential shopping

Consider where you live:

Housing costs are usually the biggest monthly expense. If you can reduce your rent — by moving somewhere cheaper, downsizing, or moving in with family temporarily — the savings can be dramatic. Even a few months of reduced rent can add thousands to your deposit fund.

Use savings accounts wisely:

Beyond the Lifetime ISA, make sure your savings are in accounts that offer competitive interest rates. Cash ISAs, regular savings accounts, and fixed-term savings bonds can all help your money grow faster. In a higher interest rate environment, the returns on savings can be meaningful.

Gifted deposits

A gifted deposit is money given to you by a family member (or sometimes a close friend) specifically for use as a mortgage deposit. This is one of the most common ways first-time buyers get onto the property ladder.

Key points about gifted deposits:

• Most lenders accept gifted deposits from immediate family members — parents, grandparents, and siblings. Some also accept gifts from other relatives or close friends, but this varies by lender
• The person giving the gift must sign a gifted deposit letter confirming that the money is a gift, not a loan, and that they have no expectation of repayment or any interest in the property
• The lender will typically require proof of the source of the gift — usually bank statements from the person giving the money
• A gifted deposit can be the entire deposit or a top-up to your own savings
• There are usually no tax implications for the buyer, though the person giving the gift should consider inheritance tax rules (gifts above the nil-rate band may be subject to IHT if the giver dies within seven years)

For a detailed explanation, read our guide to mortgages with a gifted deposit.

Deposit source requirements

Lenders are required by anti-money laundering regulations to verify where your deposit has come from. You will need to provide evidence of the source of funds, which can include:

• Personal savings — bank statements showing the savings accumulating over time
• Gifted deposit — a gifted deposit letter plus the giver’s bank statements
• Sale of a previous property — completion statement from your solicitor
• Inheritance — grant of probate or letter from the estate administrator, plus bank statements showing the receipt
• Investments — statements from investment platforms showing the sale of investments
• Bonus or redundancy payment — payslip or letter from your employer

Lenders may question large or unexplained deposits in your bank statements. If you have received money from unusual sources, discuss this with your broker in advance so it can be documented properly.

Stamp duty and your deposit budget

When budgeting for your property purchase, remember that the deposit is not your only upfront cost. Stamp duty (formally Stamp Duty Land Tax in England and Northern Ireland) is a significant expense for many buyers.

However, first-time buyers benefit from generous stamp duty relief:

• 0% on the first £300,000 of the property price
• 5% on the portion between £300,000 and £500,000
• No first-time buyer relief on properties over £500,000

This means a first-time buyer purchasing a property for £300,000 or less pays no stamp duty at all. Use our stamp duty calculator to calculate the exact amount for your situation.

If you are not a first-time buyer — for example, if you are moving home — you will need to budget for standard stamp duty rates in addition to your deposit.

Can you get a mortgage with no deposit?

It is very rare to get a mortgage with no personal deposit in the UK, but there are a few exceptions:

• Family springboard mortgages — a family member places savings in a linked account as security, allowing you to borrow 100% of the property value. Read our family springboard mortgage guide
• Guarantor mortgages — a family member guarantees your mortgage, potentially removing the need for a deposit. See our guarantor mortgage guide
• Right to Buy / Right to Acquire — council and housing association tenants can use their discount as a deposit, sometimes resulting in no additional deposit needed. Learn about Right to Buy mortgages and Right to Acquire
• Shared ownership — while you still need a deposit, it is based on the share you are purchasing (not the full property value), making it much smaller. Read our shared ownership guide

In all other cases, you will need at least a 5% deposit from verifiable sources.

Tips for maximising your deposit

Here are some additional strategies to help you build the largest deposit possible:

1. Start as early as possible — even small monthly savings add up significantly over several years, especially with compound interest and LISA bonuses
2. Set up a dedicated savings account — keep your deposit fund separate from your everyday spending account to avoid dipping into it
3. Take advantage of workplace benefits — some employers offer salary sacrifice schemes, share save schemes, or other benefits that can help you build savings
4. Consider additional income — overtime, freelance work, or selling unwanted possessions can all accelerate your savings
5. Use our repayment calculator to understand how different deposit sizes affect your monthly mortgage payments — seeing the concrete benefit of a larger deposit can be motivating
6. Get professional advice early — a mortgage broker can help you set a realistic deposit target based on your income, the areas you are looking at, and the products available

If you have had adverse credit issues, you may need a larger deposit than the standard minimum. Speaking to a specialist broker will help you understand exactly what is required.

Speak to a mortgage expert

Your deposit is the foundation of your mortgage, and getting it right can save you thousands of pounds. At Option Finance, we help buyers at every stage — from setting savings targets to finding the best mortgage product for your deposit level.

Whether you are a first-time buyer just starting to save, or you are ready to apply with your deposit in hand, our experienced advisers are here to guide you. Apply now to get personalised advice on your mortgage deposit and take the next step towards homeownership.