24 / 09 / 2026
How Much Does a £5 Million Mortgage Cost?
A £5 million mortgage over 25 years at an illustrative 5% interest rate would cost approximately £29,230 per month on a capital repayment basis. On an interest-only basis, the monthly interest would be approximately £20,833.
The actual cost of a £5 million mortgage will depend on the interest rate, mortgage term and how the borrowing is structured. At this level, however, securing the right mortgage can involve considerably more than comparing headline rates.
Borrowers requiring £5 million or more may have income derived from businesses, partnerships, bonuses or investments, while a significant proportion of their wealth may be held in property, investment portfolios or other assets. Private banks and specialist lenders can take a broader view of these circumstances, and the most appropriate structure may include repayment, interest-only or a combination of different borrowing facilities.
Below, we look at the approximate cost of a £5 million mortgage, the income and equity that may be required, and how private banks and other lenders approach borrowing at this level.
How much are the monthly repayments on a £5 million mortgage?
The monthly repayment on a £5 million mortgage can vary significantly depending on the interest rate. The table below shows illustrative monthly repayments for a £5 million capital repayment mortgage over 25 years.
| Interest rate | Monthly repayment |
|---|---|
| 4.00% | £26,392 |
| 4.50% | £27,792 |
| 5.00% | £29,230 |
| 5.50% | £30,705 |
| 6.00% | £32,215 |
These figures are illustrations rather than currently available mortgage rates and exclude lender fees and other charges.
On a mortgage of this size, relatively small differences in the interest rate can have a substantial effect on the monthly cost. The difference between 4% and 6%, for example, is approximately £5,823 per month, or almost £70,000 per year.
At this level of borrowing, however, the lowest headline rate is not necessarily the only consideration. The lender’s approach to income, assets, interest-only borrowing and the overall structure of the facility can be equally important.
For comparison, see how much a £3 million mortgage costs.
How does the mortgage term affect repayments?
The mortgage term can have a significant impact on the monthly cost of a £5 million mortgage. A longer term reduces the monthly repayment, although it increases the total amount of interest paid over the life of the mortgage.
Using an illustrative interest rate of 5%:
| Mortgage term | Monthly payment |
|---|---|
| 20 years | £32,998 |
| 25 years | £29,230 |
| 30 years | £26,841 |
For borrowers requiring a £5 million mortgage, the appropriate term may depend on more than simply achieving the lowest monthly repayment. Age, income profile, future liquidity and the proposed repayment strategy can all influence how the borrowing is structured.
Some high-net-worth borrowers may also choose to split the mortgage between capital repayment and interest-only, particularly where there is a clearly defined strategy for repaying the interest-only element.
You can use our mortgage repayment calculator to see how different rates and terms affect the monthly cost.
What are the interest-only repayments on a £5 million mortgage?
Interest-only borrowing is often considered for larger mortgages, particularly where the borrower has substantial assets and a credible strategy for repaying the capital at the end of the term.
On an interest-only mortgage, the monthly payment covers the interest charged but does not reduce the £5 million capital balance.
| Interest rate | Monthly payment |
|---|---|
| 4.00% | £16,667 |
| 4.50% | £18,750 |
| 5.00% | £20,833 |
| 5.50% | £22,917 |
| 6.00% | £25,000 |
At 5%, for example, the monthly interest payment would be approximately £20,833, compared with approximately £29,230 on a 25-year capital repayment mortgage.
For a £5 million facility, lenders will usually want to understand the proposed repayment strategy in detail. Depending on the lender and the borrower’s circumstances, this could include the future sale of property, investment portfolios, business assets or other identifiable sources of liquidity.
How much income do you need for a £5 million mortgage?
There is no single income requirement for a £5 million mortgage. For straightforward applications, lenders may initially assess borrowing using an income multiple, although at this level the borrower’s wider financial position can become increasingly important.
As a simple illustration:
| Income multiple | Income required |
|---|---|
| 4.5× income | £1,110,000 |
| 5× income | £1,000,000 |
| 5.5× income | £910,000 |
These figures should not be treated as fixed lending criteria. A borrower requiring £5 million may have a financial profile that does not fit neatly into a conventional income multiple.
For example, income may include substantial bonuses, partnership drawings, dividends or business profits. Some borrowers may also have significant assets and investments despite having a comparatively lower level of conventional earned income.
Private banks and specialist lenders can sometimes take a more individual approach, considering the borrower’s income, assets, liabilities and wider wealth when assessing the overall affordability and structure of the mortgage.
How much deposit do you need for a £5 million mortgage?
The amount of deposit or equity required for a £5 million mortgage will depend on the lender, property and overall strength of the application.
For a £5 million mortgage, the approximate property value and equity required at different loan-to-value levels would be:
| Loan-to-value | Property value | Deposit / equity |
|---|---|---|
| 80% LTV | £6,250,000 | £1,250,000 |
| 75% LTV | £6,670,000 | £1,670,000 |
| 70% LTV | £7,140,000 | £2,140,000 |
| 60% LTV | £8,330,000 | £3,330,000 |
A lower loan-to-value can potentially provide access to a wider range of lenders and more competitive terms, although the cheapest mortgage rate is not always the primary consideration for high-net-worth borrowers.
Some borrowers may prefer to retain capital within a business or investment portfolio rather than committing additional liquidity to a property purchase. In these circumstances, the amount of equity contributed can form part of a wider discussion about how the borrowing is structured.
Which lenders offer £5 million mortgages?
A £5 million mortgage sits beyond the typical lending requirements of most borrowers, but there are still a number of potential routes depending on the circumstances.
Some high-street and specialist banks can consider mortgages of this size, particularly where the application is relatively straightforward and the loan-to-value is appropriate. However, private banks can become increasingly relevant as borrowing moves into this range.
Private banks may be particularly suitable where the borrower has:
- Complex or multiple sources of income;
- Significant bonuses or variable remuneration;
- Business ownership or partnership income;
- Substantial investment portfolios or other assets;
- A requirement for significant interest-only borrowing; or
- Wider banking or wealth-management requirements.
Rather than assessing the mortgage purely through a standardised affordability model, some private banks can take a more individual view of the borrower’s overall financial position.
This does not necessarily mean that a private bank will always provide the most appropriate solution. The right lender will depend on the property, loan-to-value, income structure, assets and the borrower’s wider objectives.
Why can private banks be suitable for a £5 million mortgage?
Private banks can become particularly relevant for £5 million mortgages because they may take a broader view of a borrower’s financial position than a conventional mortgage assessment.
Rather than relying solely on salary or a standard income multiple, a private bank may consider the relationship between the borrower’s income, assets, investments, business interests and existing liabilities.
This can be particularly useful where substantial wealth is held outside conventional earned income, or where the mortgage requires a more bespoke structure.
Private banks may also offer greater flexibility around:
- Interest-only borrowing;
- Complex or international income;
- Business owners and entrepreneurs;
- Investment portfolios and other liquid assets;
- Multiple properties and existing borrowing; and
- Bespoke repayment strategies.
However, private banking is not automatically the best route for every £5 million mortgage. Some high-street or specialist lenders may provide highly competitive options where the borrower fits their criteria.
The key is to compare the overall lending structure, rather than assuming that a private bank or the lowest advertised rate will necessarily provide the most suitable solution.
How can assets and wider wealth affect a £5 million mortgage?
For high-net-worth borrowers, affordability may not always be fully reflected by salary or conventional earned income alone.
A borrower may have significant wealth held across investment portfolios, businesses, property or cash, while deliberately drawing a relatively modest level of income. At the £5 million level, some lenders – particularly private banks – may be willing to consider this wider financial position when assessing an application.
Assets that may form part of the overall assessment can include:
- Investment portfolios;
- Cash and deposits;
- Other residential or investment property;
- Business interests;
- Pensions and other long-term investments; and
- Other readily identifiable sources of wealth or future liquidity.
The treatment of these assets varies considerably between lenders. Their existence does not automatically increase borrowing capacity, but they can provide important context around the borrower’s overall financial strength and proposed repayment strategy.
For borrowers with substantial liquid investments, there may also be circumstances where Lombard lending can form part of the wider financing strategy. This involves borrowing against an investment portfolio rather than selling the underlying investments, although it carries different risks and considerations from conventional mortgage borrowing.
Can Lombard lending be used alongside a £5 million mortgage?
For borrowers with substantial investment portfolios, Lombard lending can sometimes be considered alongside traditional property finance as part of a wider borrowing strategy.
Rather than selling investments to increase the deposit or reduce the mortgage, a Lombard facility allows borrowing to be secured against eligible investments. This can provide access to liquidity while allowing the underlying portfolio to remain invested.
For example, a high-net-worth borrower purchasing a property may have significant wealth held in an investment portfolio but prefer not to liquidate those assets solely to fund the purchase.
However, Lombard lending is fundamentally different from mortgage borrowing. The amount available depends on the type and value of the assets pledged, and changes in the value of the underlying portfolio can affect the facility. Additional security or repayment may be required if asset values fall.
For this reason, Lombard lending should be considered as part of the borrower’s overall financing and liquidity strategy, rather than simply as an alternative way of increasing mortgage borrowing.
Are interest rates higher on a £5 million mortgage?
Not necessarily. The interest rate available on a £5 million mortgage will depend on the lender, loan-to-value, property, income profile and overall strength of the application.
Some lenders may price larger mortgages individually rather than relying solely on standard published products. This can be particularly relevant with private banks, where the overall relationship and financial profile of the borrower may form part of the lending decision.
Factors that can influence pricing include:
- Loan-to-value;
- Size and type of property;
- Income and affordability;
- Assets and overall financial strength;
- Whether the mortgage is repayment or interest-only; and
- The wider banking relationship.
For a £5 million mortgage, even a relatively small difference in interest rate can have a significant financial impact. However, the lowest rate should be considered alongside flexibility, fees, early repayment terms and the overall structure of the facility.
For high-net-worth borrowers, a slightly higher headline rate may sometimes accompany lending terms that are better suited to their wider financial circumstances.
What do lenders assess on a £5 million mortgage?
At this level of borrowing, lenders will usually look beyond the mortgage amount and headline income figure to understand the borrower’s overall financial position.
The assessment may include:
- Income, bonuses and variable remuneration;
- Business ownership, partnership income and company profits;
- Existing mortgages and other borrowing commitments;
- Deposit, equity and loan-to-value;
- Investment portfolios, cash and other assets;
- The property being purchased or refinanced;
- The proposed repayment strategy for interest-only borrowing; and
- The borrower’s wider financial position and future liquidity.
For high-net-worth borrowers, the way these elements fit together can be just as important as any single figure.
A borrower with complex income but substantial liquid assets, for example, may be assessed very differently from someone relying entirely on earned income to support the same £5 million mortgage.
Why use a broker for a £5 million mortgage?
Arranging a £5 million mortgage can involve a much wider range of lenders and structures than a conventional residential mortgage.
A specialist large-mortgage broker can assess options across high-street banks, specialist lenders and private banks, rather than approaching the application on the basis of headline rates alone.
This can be particularly valuable where the borrower has:
- Complex or multiple income streams;
- Significant bonuses or variable remuneration;
- Business or partnership income;
- Substantial assets or investment portfolios;
- A requirement for interest-only borrowing; or
- A more complex property or borrowing structure.
At this level, lender selection can be particularly important. Different banks can take significantly different approaches to the same income, assets and repayment strategy.
Magni Finance specialises in large and complex mortgages and works with borrowers requiring £1 million or more, including high-net-worth clients whose circumstances may require a more bespoke approach.
Speak to Magni Finance about a £5 million mortgage
A £5 million mortgage often requires a more individual approach than a standard residential mortgage. The most appropriate solution will depend on your income, assets, property, loan-to-value and wider financial circumstances.
Magni Finance specialises in arranging large and complex mortgages for high-net-worth clients, working across high-street banks, specialist lenders and private banks to identify suitable options for substantial borrowing requirements.
Whether you are purchasing a property, refinancing an existing mortgage or considering a more bespoke borrowing structure, we can assess your circumstances and discuss the options available.
Speak to Magni Finance to discuss your £5 million mortgage requirements.
