24 / 09 / 2026
How Much Does a £3 Million Mortgage Cost?
A £3 million mortgage over 25 years at an illustrative 5% interest rate would cost approximately £17,538 per month on a capital repayment basis. On an interest-only basis, the monthly interest would be approximately £12,500.
The actual cost of a £3 million mortgage will depend on the interest rate, mortgage term and whether the loan is arranged on a repayment or interest-only basis. At this level of borrowing, lender choice and the structure of the application can become increasingly important, particularly where income is complex or a significant proportion of the borrower’s wealth is held in investments, businesses or other assets.
Below, we look at the approximate monthly repayments on a £3 million mortgage, the income and deposit that may be required, and how high-street banks, private banks and specialist lenders approach borrowing at this level.
How Much Are the Monthly Repayments on a £3 Million Mortgage?
The table below shows the approximate monthly repayments on a £3 million capital repayment mortgage over 25 years at different illustrative interest rates.
| Interest rate | Monthly repayment |
|---|---|
| 4.00% | £15,835 |
| 4.50% | £16,675 |
| 5.00% | £17,538 |
| 5.50% | £18,423 |
| 6.00% | £19,329 |
This means the difference between a 4% and 6% interest rate on a £3 million mortgage is approximately £3,494 per month, demonstrating how even relatively small differences in interest rates can have a substantial impact on larger mortgage repayments.
For comparison, see how much a £2 million mortgage costs at different interest rates.
How Does the Mortgage Term Affect a £3 Million Mortgage?
The mortgage term can have a significant impact on the monthly repayments. A longer term reduces the monthly payment, but increases the total amount of interest paid over the life of the mortgage.
The table below shows the approximate monthly repayments on a £3 million repayment mortgage at an illustrative 5% interest rate over different mortgage terms.
| Mortgage term | Monthly repayment |
|---|---|
| 20 years | £19,799 |
| 25 years | £17,538 |
| 30 years | £16,105 |
Extending the term from 20 to 30 years reduces the monthly repayment by approximately £3,694, although the mortgage would remain outstanding for an additional 10 years and the total interest paid would be higher.
How Much Is a £3 Million Interest-Only Mortgage Per Month?
With an interest-only mortgage, the monthly payments cover the interest charged rather than reducing the original £3 million balance. This results in lower monthly payments than a repayment mortgage, but the full loan amount will still need to be repaid at the end of the term.
The table below shows the approximate monthly interest payments on a £3 million interest-only mortgage at different illustrative interest rates.
| Interest rate | Monthly payment |
|---|---|
| 4.00% | £10,000 |
| 4.50% | £11,250 |
| 5.00% | £12,500 |
| 5.50% | £13,750 |
| 6.00% | £15,000 |
At an illustrative 5% interest rate, a £3 million interest-only mortgage would therefore cost approximately £12,500 per month in interest. The borrower would still owe the original £3 million at the end of the mortgage term.
For larger mortgages, lenders will usually want to understand how the capital will ultimately be repaid. Acceptable repayment strategies vary between lenders and can be particularly important when arranging high-value interest-only borrowing.
How Much Income Do You Need for a £3 Million Mortgage?
The income required for a £3 million mortgage will depend on the lender and the borrower’s overall financial circumstances. Standard income multiples can provide a useful indication, although applications of this size are often assessed in greater detail.
| Income multiple | Income required |
|---|---|
| 4.5× income | £670,000 |
| 5× income | £600,000 |
| 5.5× income | £545,000 |
For example, if a lender were prepared to lend five times income, a household income of approximately £600,000 would theoretically support a £3 million mortgage. However, lenders will also consider expenditure, existing borrowing, dependants, the mortgage term and other financial commitments when assessing affordability.
At this level of borrowing, income may come from a combination of sources. Depending on the lender, this can include salary, bonuses, dividends, company profits, investment income and other forms of remuneration.
High-net-worth borrowers with substantial assets or wider wealth may also have options with private banks and specialist lenders that assess the broader financial position rather than relying solely on a standard income multiple.
How Much Deposit Do You Need for a £3 Million Mortgage?
The deposit required for a £3 million mortgage will depend on the lender, property and loan-to-value (LTV). A larger deposit reduces the LTV and can potentially increase the range of lenders and mortgage options available.
The examples below show the approximate property value and deposit required for a £3 million mortgage at different LTVs.
| LTV | Property value | Deposit / equity |
|---|---|---|
| 80% | £3,750,000 | £750,000 |
| 75% | £4,000,000 | £1,000,000 |
| 70% | £4,290,000 | £1,290,000 |
| 60% | £5,000,000 | £2,000,000 |
For example, a £3 million mortgage at 75% LTV would correspond to a property worth approximately £4 million, requiring a deposit of around £1,000,000.
There is no single deposit requirement for a £3 million mortgage. Maximum LTVs can vary according to the lender, property, loan size and borrower’s circumstances, and some lenders may apply lower maximum LTVs as the size of the mortgage increases.
Which Lenders Offer £3 Million Mortgages?
£3 million mortgages are available from a range of lenders, although the number of suitable options can become more limited as the loan size increases. The most appropriate lender will depend on the borrower’s income, assets, property and overall financial circumstances.
Some high-street banks can provide mortgages at this level where the application fits their lending criteria. For borrowers with more complex circumstances or substantial wider wealth, private banks and specialist lenders can provide additional options.
This can be particularly relevant where the application involves:
- Large bonuses or variable remuneration;
- Dividends or company profits;
- Significant investment portfolios or other assets;
- Multiple sources of income;
- Interest-only borrowing; or
- A property or loan structure that falls outside standard lending criteria.
With a £3 million mortgage, lender criteria can differ considerably, including maximum loan sizes, acceptable income sources and loan-to-value limits. Comparing different parts of the market can therefore be particularly important for borrowing at this level.
Are Interest Rates Higher on a £3 Million Mortgage?
Not necessarily. A £3 million mortgage does not automatically mean paying a higher interest rate. The rate available will depend on factors including the loan-to-value, property, income and overall strength of the application.
Some mainstream lenders offer competitive rates on larger mortgages where the borrower meets their criteria. Private banks and specialist lenders may price larger or more complex mortgages differently, particularly where the application requires more bespoke underwriting.
With a mortgage of this size, even a relatively small difference in interest rate can have a significant impact on the monthly payment and overall cost of borrowing. For example, on a £3 million repayment mortgage over 25 years, the difference between an illustrative rate of 4% and 5% is approximately £1,703 per month.
It is therefore important to consider both the interest rate and the overall mortgage structure, including arrangement fees, repayment terms and any other costs associated with the borrowing.
What Do Lenders Look at for a £3 Million Mortgage?
When assessing a £3 million mortgage, lenders will consider more than simply the size of the applicant’s income. The assessment will depend on the lender, but typically includes:
- Income, bonuses and variable remuneration;
- Self-employed income and company profits;
- Existing mortgages and other borrowing commitments;
- Deposit, loan-to-value and property profile;
- Assets, investments and wider wealth; and
- The proposed repayment strategy for interest-only borrowing.
For high-net-worth borrowers, some lenders may take a broader view of the overall financial position. This can include investment portfolios, business interests, property assets and available liquidity alongside conventional income.
Lender criteria can vary considerably at this level of borrowing, so a £3 million mortgage application that does not fit the criteria of one bank may be acceptable to another.
Can You Get a £3 Million Mortgage Through a Private Bank?
Yes. Private banks are often an option for £3 million mortgages, particularly where the borrower has substantial assets, complex income or wider wealth that may not fit a standard mortgage assessment.
Rather than relying solely on salary and conventional income multiples, a private bank may consider the borrower’s broader financial position. This can include investment portfolios, business interests, property assets, bonuses, dividends and other sources of wealth or income.
In some cases, the mortgage may form part of a wider private banking relationship. However, using a private bank is not always necessary for a £3 million mortgage. Some high-street banks can also provide mortgages of this size where the borrower meets their lending criteria.
The appropriate route will therefore depend on the borrower’s circumstances, the property, loan-to-value and how the mortgage needs to be structured.
Do You Need a Mortgage Broker for a £3 Million Mortgage?
A mortgage broker can be particularly useful when arranging a £3 million mortgage because lending criteria, maximum loan sizes and affordability assessments can vary considerably between lenders.
While some applications may fit the criteria of a high-street bank, others may be better suited to a private bank or specialist lender. This can be particularly relevant for borrowers with complex income, significant assets, large bonuses, business interests or interest-only requirements.
A broker experienced in large mortgages can assess the overall circumstances before approaching lenders and identify which institutions are most likely to consider the required loan structure.
Speak to Magni Finance About a £3 Million Mortgage
Magni Finance specialises in arranging large and complex mortgages for high-net-worth clients. We work across high-street banks, private banks and specialist lenders to identify suitable options for borrowers requiring £3 million or more.
Whether you are purchasing a property, remortgaging or require a more complex lending structure, we can assess your circumstances and discuss the mortgage options available.
Speak to Magni Finance to discuss your £3 million mortgage requirements.
Your home may be repossessed if you do not keep up repayments on your mortgage.
