One of the most common questions buyers ask is how much deposit they really need to get a mortgage. Many people assume there is a single, fixed answer, often quoted as 10% or 20%, but the reality is more nuanced.
The amount of deposit you need depends on a combination of factors, including the type of mortgage you want, your personal circumstances, lender criteria, and how much flexibility you need in the future.
This guide explains how deposits work in the UK mortgage market, what lenders actually look at, and how to think strategically about how much deposit is right for you.
What Is a Mortgage Deposit?
A mortgage deposit is the portion of the property price you pay upfront, with the remainder funded by a mortgage.
For example, if you buy a property for £300,000 and put down a £30,000 deposit, you are borrowing £270,000. This means your loan-to-value (LTV) is 90%.
Lenders use LTV as a key measure of risk. The higher the LTV, the more risk the lender takes on.
Is There a Minimum Deposit?
Although most buyers will still need a deposit of at least 5%, a small number of lenders now offer 100% loan-to-value mortgages, meaning it may be possible to purchase a property without providing a deposit.
These zero-deposit mortgages are not widely available and usually come with specific eligibility requirements. Depending on the product, applicants may need to demonstrate a strong history of making rental payments, meet minimum income requirements, have a good credit record or select from a more limited range of eligible properties.
In practice:
- 0% deposit mortgages are available from a limited number of lenders
- 5% deposit mortgages provide a wider choice, but rates may still be higher
- Eligibility and affordability checks can be stricter at higher loan-to-value levels
- Certain properties, including some flats and new-build homes, may not be accepted
- Buyers will still need money for legal fees, surveys, moving expenses and any applicable Stamp Duty
A zero or 5% deposit mortgage may help some buyers purchase sooner, but it is important to consider the higher borrowing amount, monthly repayments and the risk of negative equity if property prices fall.
Why Lenders Care About Deposit Size
Deposit size directly affects lender risk.
A larger deposit:
- Reduces the lender’s exposure if property prices fall
- Improves affordability resilience
- Signals borrower commitment and stability
Because of this, lenders reward larger deposits with better rates, wider choice, and more flexible criteria.
Common Deposit Bands Explained
Rather than there being one universally required deposit, lenders typically group mortgages into loan-to-value bands.
Common deposit bands include:
- 0% deposit (100% LTV), available from a limited number of lenders
- 5% deposit (95% LTV)
- 10% deposit (90% LTV)
- 15% deposit (85% LTV)
- 20% or more (80% LTV and below)
Moving from one band to another can have a significant impact on interest rates, monthly repayments and the number of lenders available. Although a zero-deposit mortgage may be possible in certain circumstances, saving even a modest deposit will usually provide access to a wider range of options.
How Much Deposit Do First-Time Buyers Really Need?
First-time buyers often worry that they need a very large deposit to get started.
In reality:
- Many first-time buyers purchase with 5–10% deposits
- Lenders may be more flexible with strong income profiles
- Government-backed schemes have helped support higher LTV lending
However, first-time buyers should balance getting on the ladder with long-term affordability. A smaller deposit often means higher monthly payments.
Deposits and Mortgage Rates
Deposit size has a direct impact on the interest rate offered.
As a general rule:
- Higher deposits unlock lower rates
- Rate reductions are not linear
- Big improvements often occur at key LTV thresholds
For example, moving from 90% to 85% LTV may reduce the rate more than moving from 85% to 80%.
This is why saving a little extra can sometimes make a disproportionate difference.
Deposit Size vs Monthly Payments
Many buyers focus on the deposit purely as a hurdle to clear.
In reality, deposit size also affects:
- Monthly repayments
- Total interest paid over time
- Flexibility to remortgage later
A smaller deposit gets you into the market sooner, but a larger deposit can significantly reduce long-term costs.
How Deposit Requirements Differ for Home Movers
Home movers often use equity from their existing property as a deposit.
This means:
- Deposit size depends on current property value
- Market valuations matter
- Equity can change lender options significantly
Even if you did not start with a large deposit, price growth and repayments may have improved your position over time.
Remortgaging and Deposit (Equity) Requirements
When remortgaging, the “deposit” is effectively your equity.
Lenders assess:
- Current property value
- Outstanding mortgage balance
- Resulting loan-to-value
Improved equity can unlock:
- Better rates
- Wider lender choice
- More flexible products
However, if values have fallen or borrowing has increased, options may be more limited.
Buy-to-Let Deposit Requirements
Buy-to-Let deposits are typically higher than residential ones.
Most Buy-to-Let lenders require:
- At least 25% deposit
- Larger deposits for higher-risk properties or borrowers
In Buy-to-Let, rental income and stress testing often matter more than personal income, but deposit size still plays a critical role.
Does Credit History Affect Deposit Requirements?
Yes, credit history can influence how much deposit you need.
With adverse or historic credit issues:
- Lenders may require larger deposits
- Interest rates may be higher
- Options may be limited to specialist lenders
A stronger deposit can sometimes offset credit concerns, but it does not remove the need to pass affordability and underwriting checks.
Do High Earners Need Smaller Deposits?
High income does not automatically reduce deposit requirements.
Lenders assess:
- Deposit size
- Income sustainability
- Overall risk profile
High earners may borrow more, but deposit requirements are still driven by LTV bands rather than income alone.
Gifted Deposits: What You Need to Know
Many buyers use gifted deposits from family members.
Lenders generally accept gifted deposits, provided:
- The gift is non-repayable
- The source is clearly documented
- The giver provides confirmation
Gifted deposits are common, particularly among first-time buyers, but paperwork must be handled carefully.
Using Equity Instead of Cash
Not all deposits come from savings.
Some buyers use:
- Equity from another property
- Proceeds from a sale
- Family assistance secured elsewhere
Lenders focus on the resulting LTV, not where the funds physically sit, provided the structure is clear and acceptable.
Is It Better to Wait and Save More?
This is one of the most difficult questions for buyers.
Waiting to save more can:
- Reduce monthly payments
- Unlock better rates
- Improve long-term affordability
Buying sooner can:
- Get you onto the property ladder
- Avoid rising rents
- Allow equity to build earlier
There is no universal right answer. The decision should be based on affordability, stability, and long-term plans rather than deposit size alone.
Common Misconceptions About Deposits
There are several persistent myths around deposits.
Common misconceptions include:
- You always need 20%
- A 5% deposit is a bad idea
- Lenders only care about the deposit
- A larger deposit guarantees approval
In reality, deposit size is just one part of a wider assessment.
What Else Matters as Much as Deposit Size?
While deposit size is important, lenders also assess:
- Income and employment stability
- Outgoings and existing commitments
- Credit history
- Property suitability
A strong deposit cannot compensate for weak affordability or unsuitable property types.
How to Think Strategically About Your Deposit
Rather than asking “what is the minimum?”, a better question is “what works best for me?”.
Strategic considerations include:
- Monthly affordability comfort
- Future remortgaging plans
- Potential changes in income
- Risk tolerance
Sometimes the “right” deposit is not the smallest possible, but the one that gives flexibility and peace of mind.
Why Advice Matters When Deciding on a Deposit
Mortgage advisers often help buyers assess different deposit scenarios.
This includes:
- Comparing monthly payments at different LTVs
- Assessing rate changes across bands
- Planning for future remortgages
Small differences in deposit size can have long-term implications that are not obvious at first glance.
Final Thoughts
There is no single answer to how much deposit you really need. While 5% may be enough in some cases and 25% or more may be ideal in others, the right deposit is the one that balances affordability, flexibility, and long-term planning.
Rather than focusing solely on the minimum required, borrowers benefit most from understanding how deposit size affects rates, payments, and future options. With that understanding, the decision becomes far more informed — and far less stressful.
