Your buy-to-let deposit does more than reduce the amount you need to borrow. It affects your loan-to-value, the mortgage rates you may be able to access, how lenders assess the risk and how your rental income stacks up against the mortgage.
In simple terms, a bigger deposit usually means a lower loan-to-value. That can improve your mortgage options, but it also means putting more money into the property upfront. The right balance depends on your budget, expected rent, investment goals and wider financial position.
Before deciding how much deposit to put down
✓ Work out your loan-to-value first
Your deposit affects the LTV, which shows the mortgage as a percentage of the property value.
✓ Check how a lower LTV affects your options
A larger deposit may give you access to more lenders, better rates or wider criteria.
✓ Test the rent against the mortgage
A bigger deposit can help, but the expected rent still needs to support the borrowing.
✓ Keep money back for other costs
Putting more into the deposit may reduce payments, but you may still need cash for stamp duty, fees, repairs and periods without tenants.
What loan-to-value means
Loan-to-value, often shortened to LTV, shows the mortgage as a percentage of the property value.
If you buy a property for £250,000 and borrow £187,500, the mortgage is 75% of the property value. The remaining 25% would usually be your deposit.
Property value
Mortgage amount
Deposit
Loan-to-value
£250,000
£187,500
£62,500
75%
A lower LTV means there is more equity in the property from the start. A higher LTV means you are borrowing more against the property, which can make lender checks tighter.
Illustration only. Actual borrowing, rates and payments depend on the property value, deposit, lender criteria, rental income, mortgage term, fees and your circumstances.
Why deposit size matters
Your deposit can affect the mortgage route, lender choice and how easily the rent supports the borrowing.
A larger deposit may reduce the loan amount, improve the LTV and make the lender’s rental stress test easier to pass. This is because the expected mortgage payment is usually lower when the borrowing is lower.
It may also open up more lender options. Some lenders have different products, rates or criteria depending on the LTV band. For example, the options at 75% LTV may differ from the options at 80% LTV.
However, using a larger deposit is not always automatically better. If it leaves you with little money for Stamp Duty, legal fees, refurbishment, void periods or maintenance, the investment may feel stretched from day one.
Higher LTV vs larger deposit
There is usually a balance between keeping more cash available and reducing the amount you need to borrow.
Higher LTV
A higher LTV can help you use less of your own money upfront. This may be useful if you want to keep funds available for improvements, another purchase or wider portfolio plans.
However, the mortgage may cost more, the lender’s choice may be narrower, and the borrower may need to work harder to support the borrowing.
Larger deposit
A larger deposit can reduce the mortgage balance and may improve cash flow by lowering monthly payments. It can also make the application stronger with some lenders.
However, it ties more of your money into one property and may leave less available for costs or future opportunities.
Ways to improve your deposit or loan-to-value position
If your deposit is lower than expected, or your loan-to-value is higher than a lender is comfortable with, there may be ways to improve your position before applying.
The right option depends on your savings, property value, existing borrowing and wider plans.
Route 1: Deposit
Increase the cash you put in
Adding more deposit can reduce the mortgage amount, lower the loan-to-value and improve lender choice.
Route 2: Equity
Use funds from another property
Some landlords use equity from an existing property to help fund a buy-to-let deposit, subject to lender criteria and affordability.
Route 3: Purchase price
Negotiate or buy at a lower price
A lower purchase price can make the same deposit go further and reduce the amount you need to borrow.
Route 4: Cash reserve
Wait and strengthen your position
Delaying the purchase may help you build a larger deposit while keeping money aside for costs and void periods.
Before increasing your deposit, check that you still have enough money left for purchase costs, repairs, void periods and ongoing landlord expenses. A stronger loan-to-value can help, but not if it leaves the investment short of cash.
Finding the right balance
The right deposit is not always the biggest deposit you can afford. It is the amount that helps the mortgage work while still leaving enough money for the wider investment.
Before deciding how much to put down, think about:
- Mortgage fit: whether the rent supports the borrowing at your chosen LTV
- Cash reserve: how much money you will have left for repairs, void periods and running costs
- Purchase costs: Stamp Duty, legal fees, valuation fees, broker fees and any refurbishment work
- Future plans: whether you want to keep cash available for another property or portfolio growth
- Monthly cash flow: how the deposit size affects the mortgage payment and rental profit
The right route depends on what matters most: lower payments, stronger cash flow, keeping cash available or building a portfolio over time.
How Muttuo Mortgages can help
Muttuo Mortgages can help you understand how your deposit affects your buy-to-let mortgage options.
We can review the property value, expected rent, deposit, loan-to-value and your wider position, then compare suitable routes across over 100 lenders.
Our team can help you review:
✓ whether your planned deposit is likely to fit lender criteria
✓ how loan-to-value may affect your mortgage options
✓ whether the expected rent supports the borrowing
✓ whether a larger deposit could improve lender choice or cash flow
✓ what may be realistic before you buy or remortgage
That can help you see whether your deposit is realistic, how the mortgage may affect rental cash flow and what options could be available before you move ahead.
Check your buy-to-let deposit position
See how your deposit, rent and loan-to-value could affect your mortgage options before you commit.
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Frequently asked questions about buy-to-let deposits and loan-to-value
These FAQs cover common questions about buy-to-let deposit sizes, loan-to-value, rental checks and how deposit size can affect your mortgage options.
How much deposit do I need for a buy-to-let mortgage?
You usually need a larger deposit for a buy-to-let than for a residential mortgage.
Many lenders expect a deposit of around 25%, although requirements can vary depending on the lender, property, rental income, borrower profile and loan-to-value. Some landlords may need a larger deposit to access suitable options or pass affordability checks.
What does loan-to-value mean on a buy-to-let mortgage?
Loan-to-value shows how much you are borrowing compared with the property value.
For example, if a property is worth £250,000 and the mortgage is £187,500, the loan-to-value is 75%. The remaining 25% is your deposit or equity.
Can a bigger deposit help me get a buy-to-let mortgage?
Yes, it can sometimes improve your position.
A bigger deposit reduces the loan amount and lowers the loan-to-value. This may improve lender choice, reduce monthly payments and make the rental stress test easier to pass.
However, you should also keep enough money aside for purchase costs, repairs, void periods and ongoing landlord expenses.
Does a lower LTV mean a better buy-to-let rate?
It can, but not always.
Some lenders offer different rates depending on the loan-to-value band. A lower LTV may give you access to more competitive options, but the final rate will also depend on the lender, product type, property, rental income, ownership structure and your wider profile.
Can I get a buy-to-let mortgage with less than 25% deposit?
It may be possible, but lender choice can be more limited.
Some lenders may consider higher loan-to-value buy-to-let mortgages, but the rent, property type, borrower profile and wider application usually need to fit their criteria. A smaller deposit can also mean higher monthly payments and a tighter rental stress test.
Should I use all my savings for the buy-to-let deposit?
Not usually. It is important to keep money aside for the wider costs of owning a rental property.
You may need funds for Stamp Duty, legal fees, valuation fees, repairs, refurbishment, insurance, void periods and ongoing maintenance. A larger deposit can help with the mortgage, but the investment may feel stretched if you have no cash reserve left.
