£1m Mortgage Deposits and Lender Options

A £1 million buy-to-let mortgage can be possible, and the loan size alone doesn’t rule it out. In UK specialist mortgage finance, borrowing above £1,000,000 is classed as a large loan, so bespoke terms on large mortgage loans over £1 million may depend on the property, rental income, deposit and your wider finances.

It’s understandable to expect a large deposit or a straightforward income multiple to decide the outcome. In practice, lenders assess applications differently, and buy-to-let criteria can differ from those for a home you’ll live in. The right fit depends on how the rent supports the borrowing, alongside your income, credit history and the property itself.

This article explains what can shape deposit requirements, how lender options differ and what bespoke terms may involve. You’ll also see how specialist mortgage advice can help you present a large-loan application clearly, particularly when your income or property plans don’t fit a standard pattern.

What Is A Large Loan Mortgage?

In UK specialist mortgage finance, a large loan means borrowing above £1,000,000. Lenders assess affordability using income and wider finances, with the method depending on the application.

Income and affordability measures

Income multiples offer a starting point, not a complete affordability decision. Income multiples can vary between lenders, and they are only one part of an affordability assessment. For example, borrowing £1,000,000 at five times income implies £200,000 income; at six times, it implies approximately £167,000.

For a large loan, affordability may reflect assets, liabilities and overall wealth, not salary alone. Prepare a clear picture of your regular commitments, existing borrowing and available assets. If you’re self-employed or a company director, organise evidence showing how you draw income, including salary, dividends and retained profit. Lenders assess these income sources differently.

Non-standard income assessment

Bonuses, carried interest, restricted stock units (RSUs) and investment income can make an application more complex. Lenders look at how the income is earned, its pattern and supporting documentation. Standard lenders often count only 50% of bonuses, whilst some lenders count 100%; most banks consider up to 75% of cash bonuses when there’s a track record.

Some private banks require a track record of RSU allocations lasting 2 to 3 years before including them in affordability calculations. International income adds another layer: the currency, payment structure and evidence available can affect how a lender assesses it. Cross-border lending also requires a clear account of where income originates and how it reaches the borrower.

Loan-to-value and debt-to-income ratios

Loan-to-value (LTV) compares the mortgage with the property’s value. A £750,000 mortgage on a £1,000,000 property is 75% LTV. The deposit covers the remaining purchase price, and a lower LTV can change the lender options available. For large mortgages, 75% is a standard ceiling; specialist lenders may consider up to 85% in certain circumstances.

Debt-to-income compares debt with income and helps show how existing commitments affect affordability. Lenders’ considered ratios range from 85% to 120%, while most cap them around 100%. Review credit commitments alongside income, rather than focusing on salary alone. Energy efficiency is a separate property consideration; the guide to energy-efficient home loans explains that angle.

What Deposit Is Required for a £1m Mortgage?

There isn’t one deposit figure for every large mortgage. The amount depends on whether £1 million refers to the property price or the loan, plus the lender’s maximum loan-to-value (LTV) and criteria. For a property worth £1 million, a 10-20% deposit means £100,000-£200,000, a typical range cited for this market.

Some high-street lenders generally require a 15% deposit for a £1 million or larger mortgage. Other lenders’ high-value property criteria commonly call for 20-40%, while some applicants may qualify for a smaller deposit. A 5% deposit is possible with some UK lenders, although rates are likely to be higher. These differences make it important to compare the deposit against the property value and the loan requested.

A larger deposit reduces the amount borrowed compared with the property’s value. This loan-to-value ratio, or LTV, can affect which lenders consider your application and the rates they offer. It doesn’t automatically secure a lower rate: affordability, credit history, property details and lender criteria also matter. Compare the full mortgage terms, not just the deposit or headline rate.

Maximum loan sizes can narrow the choice further. In September 2026, 18 of 116 lenders tracked for residential criteria published a maximum loan of £5 million or more; six published a maximum of £10 million or more. For buy-to-let, 14 of 79 lenders tracked for those criteria published a maximum loan of at least £5 million. These figures show why a lender’s maximum borrowing limit matters alongside its LTV.

When preparing an application, ask how the lender treats the deposit’s source and the property valuation. The valuation is used to calculate LTV, while the deposit covers the gap between that valuation and the loan. If the valuation is below the agreed purchase price, you may need a larger deposit to meet the lender’s LTV limit. Keep evidence of your funds and a clear record of any gifted deposit ready.

Repayment choice matters too. Of 116 lenders tracked for residential criteria, 63 offered interest-only mortgages in September 2026. Interest-only reduces monthly capital repayments, but the loan balance remains due, so the application needs a credible repayment plan. Compare that with capital repayment, where monthly payments cover interest and gradually repay the loan.

For a large mortgage, consider the deposit, maximum loan, repayment method and overall affordability together. A lower deposit can preserve cash, while a larger one may open up more lender options. The right balance depends on your finances and property plans.

Private Bank vs High Street – Which Is Best?

For a large loan, the type of lender can shape how your finances are assessed. High-street lenders usually apply published criteria, while private banks and specialist lenders may consider a wider picture of wealth, assets and income. The right route depends on your circumstances, not simply the size of the mortgage.

High-street lending may suit applicants with clear, regular income and a straightforward property purchase. The research figures state that high-street lenders generally require a minimum income of £150,000 for a £1 million or larger mortgage. Their familiar processes can be useful, but standard criteria may give less weight to complex income or substantial assets.

A private bank can be relevant when salary doesn’t fully reflect your financial position. Some private banks consider clients high net worth with income above £300,000 or net assets of at least £3 million. Private-bank services typically require net assets totalling £3 million, subject to individual circumstances. These are examples of entry criteria, not a universal definition for every lender.

Wealth management can form part of the relationship. Some private banks require assets under management, with requirements ranging from £500,000 to 50% of the amount borrowed. However, lender criteria differ: 75 of 116 lenders tracked for residential criteria lend without requiring assets under management, while six require them as a condition. Ask whether the relationship includes an asset requirement, and how it affects your overall plans.

Underwriting approaches also differ. A high-value application may be assessed manually, allowing an underwriter to consider your income structure, assets, liabilities and property together. Private banks may take a relationship-based view, which can support bespoke terms for eligible borrowers. Specialist lenders may also consider cases that don’t fit a standard high-street profile.

The market for borrowing above £2 million or £5 million is dominated by private banks and specialist lenders. Some asset-rich applicants can be assessed using wealth and assets rather than traditional income multiples. This can matter when income is variable, held in a business, or tied to investments. Prepare clear evidence of assets, liabilities and income sources so the underwriter can understand the full financial picture.

Compare more than the interest rate. Check the repayment structure, any asset-management conditions, how complex income is assessed and the lender’s approach to the property. A private-bank relationship isn’t automatically better, and a high-street offer isn’t automatically simpler. The useful comparison is which criteria best fit your finances and borrowing plans.

Bespoke terms for loans over £1 million

For borrowing above £1 million, terms can reflect more than salary and property value. The structure may take account of wealth, investments, a property portfolio and how you plan to repay.

Tailored loan terms

A private bank or specialist lender may consider your wider net worth, income sources and assets. This can matter if a standard income multiple doesn’t reflect your financial position. For example, asset-backed or Lombard lending may let UK borrowers borrow without selling investments and triggering capital gains tax on a forced sale.

Terms may also reflect the purpose of the borrowing, repayment method and existing property portfolio. A lender could assess a home purchase differently from a remortgage or buy-to-let application. Ask how the proposed structure affects monthly repayments, access to investments and any assets used as security. A competitive rate is only one part of comparing the full arrangement.

Before accepting an offer, map out the key terms: loan amount, repayment basis, interest-rate structure, security and any conditions linked to your wealth. This makes it easier to compare a private-bank proposal with a high-street or specialist alternative. Bespoke terms on large mortgage loans over £1 million should fit the borrower’s wider financial plans, not just the immediate purchase.

Risks and early repayment charges

Read the mortgage offer carefully for early repayment charges, when they apply and how they’re calculated. Check whether overpayments, switching products or repaying the loan early could trigger a charge. The individual offer sets out the charges and conditions, so compare them alongside the rate and repayment period before deciding.

Other risks depend on the borrowing structure. With interest-only repayments, the capital remains outstanding and you’ll need a repayment plan. With asset-backed borrowing, investments or other assets may support the lending, so understand what could happen to that security if you can’t meet the agreed terms. If your portfolio is international, consider how currency movements could affect income used for repayments.

Check the practical exit route as carefully as the initial offer. If you may sell a property, refinance or change your investment portfolio, consider whether the mortgage terms allow this without disrupting your plans. Comparing repayment obligations, security and early repayment conditions can help you weigh flexibility against the overall borrowing arrangement.

How do property type, location and valuation affect large UK mortgage terms

A £1 million mortgage is assessed against the property securing it, not just the borrower’s finances. Property type, location and valuation influence how lenders view the security and structure the loan.

A listed building, new build or bespoke development may need a different assessment from a conventional home. High-value mortgages can be available for these non-standard property types, but lender criteria and valuation approaches matter. For example, when assessing a listed property, the valuer considers its condition and characteristics. The property’s features can also affect how easily it could be sold.

Location shapes the evidence available to value a property. A prime central London flat and a rural country home have different local markets and comparable sales. The valuer considers the property’s location and features alongside relevant market evidence. If similar properties are scarce, the valuation may require closer consideration of the individual building and its setting.

The valuation matters because lenders use it to assess the mortgage security. A difference between the valuation and purchase price can affect the LTV and the deposit needed to meet the lender’s limit. Keep funds available for that possibility when planning the purchase.

High-value property can also bring more detailed survey and valuation requirements. UK property valued above £1 million can be subject to stricter surveys and valuation requirements, even where the mortgage is relatively small. A survey examines the property’s condition, while the lender’s valuation assesses its security value. These are distinct steps, so don’t treat a purchase price as a substitute for either assessment.

For a property portfolio, lenders assess each property’s location and type, as well as the proposed security. A standard residential home, a listed building and a new development may raise different valuation considerations within the same portfolio. Prepare details of each property’s use, condition and distinctive features so the application reflects what is being financed.

Location and property type also shape the available lender choices. A £10 million mortgage case involved an international investor purchasing a prime central London property. It illustrates how a high-value purchase can involve specialist assessment of the property and borrower. The practical step is to establish the property’s likely valuation, identify any non-standard features and understand how these affect the proposed loan.

Lee Tonks: Mortgage Guru: Bad Credit Mortgages

Lee Tonks: Mortgage Guru can help you explore mortgage options when a large-loan application involves complex circumstances. Advice may be useful if your credit history, income structure or deposit needs careful consideration alongside the property and lender criteria.

For example, Bad Credit Mortgages may be relevant if past credit issues affect your application, while Self-Employed & CIS Mortgages address income that lenders may assess differently. First-Time Buyer Mortgages and Protection Advice are also available where they fit your wider plans. The aim is to clarify your options and the trade-offs, not promise a particular lender decision or rate.

If you’d like to discuss your circumstances, contact Lee Tonks: Mortgage Guru or visit leetonksmortgageguru.uk.

Set your priorities before choosing a mortgage

Before moving forward, decide what you need the mortgage to do over the course of your plans. Consider how much flexibility matters if your priorities change, and whether you value predictable repayments or room to adapt. These preferences give your discussions a useful focus beyond the initial offer.

Planning bespoke terms on large mortgage loans over £1 million means weighing the mortgage structure against your wider financial goals. A clear list of priorities can help you compare options and identify which trade-offs deserve closer attention. The terms available depend on your circumstances and the lender’s current criteria.

This article is general information only, not personalised financial advice or a mortgage recommendation. Lee Tonks: Mortgage Guru can connect you with a qualified adviser to discuss your situation and possible next steps.

A considered decision starts with knowing what matters most to you. Take the next step when you’re ready.

Frequently Asked Questions

Yes, a £1 million buy-to-let mortgage may be available if the rental income, property and applicant meet a lender’s criteria. The assessment can differ depending on whether you buy personally or through a limited company, and lenders also consider your landlord experience and wider finances. Some types of buy-to-let mortgages are not regulated by the FCA. Falling behind on repayments can lead to repossession of the property securing the mortgage.

How much can I borrow?

How much you can borrow depends on the lender’s affordability assessment, the property and your financial circumstances. For a buy-to-let, expected rent and the property’s value help shape the assessment; for a residential mortgage, income and existing commitments are central. Credit history and deposit also influence lender choice. Use your planned purchase price, income evidence, debts and expected rent to build a realistic borrowing picture, rather than relying on a headline maximum.

Is It Worth Using a Specialist Broker for a £1m+ Mortgage?

A specialist broker may be useful if your application involves variable income, a complex property portfolio or several possible lender types. Lee Tonks: Mortgage Guru connects clients with FCA-authorised, fully qualified advisers who provide independent, whole-of-market mortgage advice. This can help you compare lender criteria and understand trade-offs beyond the initial rate. Broker fees may apply, and the amount and whether they apply depend on the service and case.

What counts as a large or high-value mortgage in the UK?

In UK specialist mortgage finance, borrowing above £1,000,000 is generally classed as a large loan. That refers to the mortgage amount, not necessarily the property’s purchase price: a property can be worth more while the mortgage remains below that threshold. Some discussions of high-value property focus instead on homes valued at £5 million or more. Check whether a lender’s stated limit refers to the loan or property value.

Which UK lenders offer bespoke mortgages over £1 million?

Options can include high-street banks, private banks and specialist lenders. More than 75 banks and building societies in the UK offer mortgages of £1 million or more, but their criteria and products differ. Rather than choosing by name alone, narrow the search by property type, ownership structure, income evidence and repayment preference. A lender suited to a residential purchase may not fit a buy-to-let or a complex income case.

What are typical interest rates and fees on UK mortgages over £1 million?

There isn’t one typical rate for every mortgage above £1 million. Pricing depends on factors such as loan-to-value, repayment type, property and applicant profile, and lenders can change their products. Compare the full illustration, including the rate, product or arrangement fees, early repayment terms and total cost over the period you expect to keep the mortgage. A lower headline rate may not mean the most suitable overall deal.

How do loan-to-value limits vary for UK mortgages over £1 million?

LTV limits vary according to the property, lender and application. For example, a lender may take a different view of a standard home than a listed building or a property with a more specialised use. The valuation also matters: if it’s below the purchase price, the lender uses its valuation in the calculation. Consider both the lender’s maximum loan size and its LTV limit when planning your deposit.

What income and affordability requirements apply to UK mortgages over £1 million?

Lenders assess whether the proposed repayments fit your income and financial commitments. They may consider salary alongside bonuses, dividends, company income or investment income, using different evidence and calculations for each. Existing borrowing, regular outgoings and credit history also affect the overall picture. For buy-to-let, expected rental income is another key part of the assessment. Mortgage criteria can change, so speak with a qualified adviser for up-to-date guidance.

This content is general information only, not personalised mortgage advice. Mortgage criteria can change, so speak with a qualified adviser for up-to-date guidance. Equity released is secured against the home.