When it comes to getting a mortgage in the UK, one of the first questions many people ask is: “Is a bigger deposit always better?” It’s a common assumption that putting down a larger deposit will save you money and make the process smoother. But is that always true? The simple answer is: not necessarily. There are pros and cons to consider, depending on your personal situation and the type of mortgage you’re looking at.
In this post, we’ll explore how your deposit size can affect your mortgage options, monthly payments, and overall finances. We’ll use real-life style examples to give you a clear picture, and help you decide what works best for you.
What is a Deposit and Why Does It Matter?
A deposit is the amount of money you pay upfront when buying a home—usually expressed as a percentage of the property price. For example, if you’re buying a £200,000 home and you put down 10%, that’s a £20,000 deposit. The lender then loans you the remaining 90%, which is called the mortgage amount.
Common Deposit Sizes in the UK
- 5% deposit – Often the minimum for residential mortgages.
- 10-15% deposit – A popular middle ground.
- 20% or more deposit – Usually secures the best mortgage rates.
UK Mortgage Deposit Comparison
| Deposit Size | Loan-to-Value (LTV) | Common Mortgage Effect | Important Consideration |
|---|---|---|---|
| 5% deposit | 95% LTV | May provide access to residential mortgage options with a smaller upfront amount | Rates and lending criteria may be less competitive |
| 10% deposit | 90% LTV | A popular option for first-time buyers and home movers | Requires more savings but may provide access to better rates |
| 15% deposit | 85% LTV | Can increase the number of available mortgage options | Consider keeping enough money for fees and emergencies |
| 20% deposit | 80% LTV | Usually provides access to more competitive mortgage rates | A larger amount of savings will be tied up in the property |
| 25% or more | 75% LTV or lower | Commonly required for buy-to-let mortgages | The additional deposit may not always produce a proportionate saving |
How Does a Bigger Deposit Affect Your Mortgage?
Lower Loan to Value (LTV) and Better Rates
Mortgage lenders in the UK use something called the Loan to Value (LTV) ratio. This is the amount you’re borrowing compared to the property’s value. A bigger deposit means a lower LTV.
- If you’re putting down 20%, your LTV is 80%.
- If you put down 10%, your LTV is 90%.
A lower LTV usually means better interest rates because the lender’s risk goes down. For example, a 5% difference in LTV can save you several pounds each month.
Example
Emma wants to buy a flat costing £250,000.
- If Emma puts down 10% (£25,000), she borrows £225,000. Her interest rate might be 3.5%.
- If Emma saves more and puts down 20% (£50,000), she borrows £200,000, and maybe gets a rate of 3.0%.
That lower rate might save Emma around £30-£40 a month on her mortgage repayments. Over time, this adds up.
When a Bigger Deposit Might Not Be the Best Choice
Tying Up Your Savings
Putting down a very large deposit might feel like a good idea, but it also means locking up a big chunk of your savings in your home. This can limit your financial flexibility. For example:
- You might have less money for emergencies.
- You may not have enough for moving costs or home improvements.
- It could stop you from investing in other important things, like pensions.
Fixed vs Variable Rate Mortgages
The benefits of a bigger deposit can vary depending on the mortgage type.
- With fixed-rate mortgages, you pay a set interest rate for a certain period (usually 2, 3, or 5 years). A bigger deposit often means a lower fixed rate and more certainty in your payments.
- With variable rate mortgages, the interest rate can change based on the Bank of England’s base rate or your lender’s standard variable rate. While a bigger deposit might still help, changing rates could have a bigger impact on your monthly payments than your deposit size.
Buy to Let Mortgages
If you’re buying a property to rent out, the deposit requirements are usually higher—often 25% or more. Even then, putting down more than the minimum might not always give you proportionally better rates, depending on the lender.
Real-Life Example: Joe and Sarah’s Buy to Let Property
They have two options:
- 25% deposit on a £150,000 buy-to-let property (£37,500) with an interest rate of 4.5%.
- Or 35% deposit (£52,500) with a rate of 4.3%.
The extra £15,000 deposit reduces their rate by only 0.2%, which saves less than £20 a month in interest. Joe and Sarah decide to keep their extra savings separate for future property maintenance instead of tying them up.
Other Factors to Think About
How Quickly Do You Want to Buy?
Saving for a bigger deposit takes time. If missing out on a home you like now means waiting years to save more, it could be worth starting with a smaller deposit.
Help to Buy and First-Time Buyer Schemes
There are schemes in the UK that help first-time buyers get on the property ladder with lower deposits, such as Help to Buy or shared ownership. These can influence how much deposit you need initially.
Your Overall Financial Health
It’s also important to keep some savings aside for emergencies, rather than putting everything into a deposit.
What About Mortgage Fees?
Sometimes putting down less money upfront but choosing a mortgage with higher fees and better interest rates might make sense. Or vice versa. Always consider the whole picture, including arrangement fees and early repayment charges.
Summary: Bigger Deposit Isn’t Always Better
- A larger deposit can lower your LTV and get you better rates.
- But it may tie up your savings and reduce flexibility.
- Depending on mortgage type—fixed, variable, or buy-to-let—the benefits vary.
- Consider how quickly you want to buy and your overall financial situation.
- Look at the complete cost of your mortgage, not just the interest rate.
Your best choice depends on your personal circumstances.
Ready to Talk About Your Deposit and Mortgage Options?
Thinking about your deposit size is a great first step towards getting the right mortgage for you. Remember, everyone’s situation is unique, and there’s no one-size-fits-all answer.
If you want expert help navigating your mortgage options, the team at BSL Financials are here to guide you. We’ll explain your choices clearly, without jargon, so you can make informed decisions with confidence.
Get in touch with BSL Financials today, and let’s find the mortgage that fits your life and your future.
This blog is for information only and does not constitute regulated financial advice.
