L A R G E M O R TG A G E L O A N S
Large mortgages in the UK: how to borrow £1m+ through high street and private bank routes
Borrowing above £1m isn't just a bigger version of a standard mortgage. The lender you choose, the way your income is assessed, and the structure you build around the loan all change — and the difference between getting it right and getting it wrong is measured in tens of thousands of pounds a year.
Y O U R T E A MYou'll speak with a broker who places £1m+ mortgages every week — across high street large-loan teams and private banks
David Walsh
Director & Mortgage Broker
Founder of Kite Mortgages. Specialist in complex income structures for City professionals. Advises on mortgage strategy for high earners with partnership income, bonus-heavy pay, equity compensation, and foreign currency earnings.
View profile →
Simon Hart
Mortgage & Protection Adviser
Mortgage adviser at Kite Mortgages. Specialises in high-value purchases and remortgages for City professionals. Works with clients navigating complex income structures including variable pay, carried interest, and multi-currency earnings.
View profile →H I G H S T R E E T V S P R I V A T E B A N K Two Routes to £1m+ Borrowing
Once your mortgage crosses the £1m threshold, most lenders move your application out of their standard pipeline and into a specialist team. That's true whether you're on the high street or with a private bank — but how each route works, what it costs, and what it can do for you are very different.
Understanding which route fits your situation is the single most important decision in a large mortgage. Choose wrong and you'll either overpay for flexibility you don't need, or hit a policy wall that a different lender would have cleared easily.
High Street Large-Loan Teams
Every major UK high street lender has a dedicated large-loans desk. These teams handle applications above a certain threshold — typically £1m, sometimes £500k — and have underwriters experienced with complex income, higher LTVs at scale, and professional borrowers.
The key advantage of the high street is pricing. Rates and fees are lower than private banks, often significantly so. On a £1.5m mortgage, a 0.5% rate difference costs £7,500 a year in additional interest. Over a five-year product, that's £37,500 — a meaningful sum even for high earners.
High street large-loan teams work within published policy, but that policy has become increasingly sophisticated. Many now offer enhanced income multiples for defined professions, accept bonus and commission income on an averaged basis, allow part interest-only structures, and have clear frameworks for foreign currency income. The underwriters in these teams see complex cases daily — they're not the same team processing first-time buyer applications.
Large mortgage loans — routes via high street and private banks →
Where the high street works well: you earn predominantly UK income (PAYE or established self-employed), your deposit puts you within standard LTV bands, your income structure — even if complex — fits within published lender criteria, and you want competitive pricing with a predictable process.
Private Banks
Private banks offer bespoke underwriting. Rather than feeding your numbers into an affordability calculator and seeing what comes out, a private bank underwriter looks at your full financial picture — income, assets, liabilities, investment behaviour, and future capacity — and makes a judgement.
This flexibility comes at a cost. Rates are typically higher, arrangement fees are larger, and some private banks require you to bring assets under management (AUM) as part of the relationship. The total cost of borrowing can be meaningfully higher than the high street equivalent.
Private banks earn their premium when the high street genuinely can't do what you need. That might mean very high LTV at large loan sizes (where mainstream policy caps out), fully bespoke income assessment for structures that don't fit published criteria, full interest-only on a large balance with a flexible repayment plan, multi-currency arrangements, or asset-based lending where your wealth exceeds your declared income.
What is a private bank mortgage? →
Our Philosophy
Our default is high street if it fits. The rates and fees are lower, and mainstream large-loan teams are now very capable with complex income. We've seen too many borrowers pushed toward private banks by brokers who don't know that mainstream lenders can often do the same job at a fraction of the cost.
But when the high street genuinely can't accommodate your profile — because of income structure, LTV requirements, or the type of flexibility you need — private banks are the right answer. The point is that it should be an informed decision based on a real comparison, not a default.
We run both options where relevant, present the numbers side by side, and let you choose based on what actually matters to your situation.
A F F O R D A B I L I T Y & I N C O M E
How Affordability Works at £1m+
The mechanics of mortgage affordability don't change above £1m, but the scrutiny does. Lenders look more closely at sustainability of income, background commitments, and exit strategy — particularly where interest-only is involved.
Income Multiples and What's Realistic
Mortgage affordability is governed by two things: the lender's affordability model (income minus committed expenditure, stress-tested at a higher rate) and their loan-to-income (LTI) cap. For most borrowers, the affordability model is the binding constraint — but at large loan sizes, LTI caps can bite even when the monthly numbers work.
For strong professional profiles, income multiples of 5.0 to 5.5x are commonly achievable with mainstream lenders. Several high street lenders offer enhanced multiples for defined professions — law, medicine, accountancy, engineering — and their large-loan ranges can stretch to 5.5x or beyond where overall affordability supports it. Some will go to 6x for the strongest profiles.
Where affordability is tight, we look at the levers available: averaging variable income over 12 to 24 months rather than relying on a single year, evidencing sustainability of allowances and benefits, optimising the loan split between repayment and interest-only, extending the mortgage term, and selecting lenders whose calculators treat your specific income type most favourably.
Understanding mortgage affordability for high earners →
Variable Income — Bonus, Commission, and Profit Share
Most large-loan borrowers have significant variable income. How that income is treated makes an enormous difference to borrowing power — and every lender handles it differently.
Some lenders average your last two years of bonus income. Others use the lower of the two years. Some cap the proportion of variable income they'll include at 50% or 75%. A handful will use 100% of your latest year's bonus if you can evidence a consistent track record.
On a £200k bonus, the difference between a lender using 50% (£100k) and one using 100% (£200k) translates to roughly £500k in additional borrowing power. At large loan sizes, this isn't a marginal consideration — it's often the difference between reaching your target property and falling short.
The same logic applies to carried interest, partnership profit share, RSU income, and commission. Each has its own set of lender policies, and matching your income profile to the right lender is where specialist broker advice pays for itself many times over.
Equity compensation mortgage guide →
Deposits and LTV at Large Loan Sizes
As loan sizes increase, lenders generally want more equity in the property. That said, high-LTV lending at large loan sizes is more accessible than most borrowers expect.
At 75% LTV (25% deposit), you'll have access to the widest range of lenders and the sharpest pricing. This is the sweet spot for most large-loan applications — competitive rates, broad lender choice, and the ability to structure part of the loan on interest-only with most mainstream lenders.
At 80 to 85% LTV, the lender pool narrows but strong applications still have good options. Several mainstream lenders will lend up to 85% at £1m+ for qualifying professional profiles. Pricing steps up modestly compared to 75%.
At 90% LTV, options are limited but not impossible. A small number of mainstream lenders will consider 90% LTV at higher loan sizes for borrowers with strong income and clean credit. Private banks rarely operate at this LTV — their appetite is typically at 75% or below.
L O A N S T R U C T U R E
Structuring a Large Mortgage
At £1m+, the structure of the mortgage — not just the rate — determines whether it works for you long term. The monthly difference between a fully repaying mortgage and a part interest-only structure is substantial, and at large balances, small structural decisions compound into significant sums.
Interest-Only and Part & Part
Part interest-only (part & part) is the most common structure we build for large-loan clients. A portion of the mortgage is on capital repayment, reducing the balance over time, while the remainder is on interest-only, keeping monthly payments manageable.
For borrowers with lumpy income — annual bonuses, partnership distributions, RSU vesting — part & part aligns the mortgage with how they're actually paid. Monthly salary covers the reduced monthly payment, and periodic windfalls reduce the interest-only balance.
Lenders require a credible repayment strategy for the interest-only portion. Acceptable strategies typically include sale of the mortgaged property (with minimum equity requirements), investments or pension funds, bonus or profit share income, or cash savings. Each comes with evidence requirements and LTV caps that vary by lender.
Term Length
Extending the mortgage term is one of the simplest ways to improve monthly affordability at large loan sizes. Moving from a 25-year to a 30-year term on a £1.5m repayment mortgage at 4.5% reduces the monthly payment by roughly £900 — without changing the rate, the LTV, or the lender.
Most lenders will allow terms up to age 70 or 75, depending on your retirement income evidence. For professionals in their 30s and 40s, a 30 or 35-year term is straightforward. For those in their 50s, it may require evidence of pension income or a plan to reduce the balance before retirement.
Term length and interest-only are complementary levers. Used together, they can bring a £2m mortgage into comfortable affordability territory for a borrower earning £350k to £400k — without maximising every variable or relying on the most aggressive lender.
Foreign Currency and International Income
If any of your income is paid in a foreign currency — USD, EUR, CHF, AED — mainstream lenders will typically apply a haircut before running their affordability calculation. This reduces the income they'll assess by 10 to 25%, depending on the lender and the currency, to account for exchange rate fluctuation.
The variation between lenders is substantial. One might use 75% of your USD salary while another uses 90%. On a £200k income, that's a £30k difference in assessed income, translating to over £100k in additional borrowing power.
We work with all major high street lenders that accept foreign currency income and know their policies in detail. Where mainstream policy blocks your application — because the currency isn't accepted, the haircut is too aggressive, or your UK footprint is too short — private banks can often find a route, though typically at a higher cost.
C H O O S I N G Y O U R R O U T E
When Each Route Wins
Choosing between high street and private bank isn't about prestige or perception. It's about which route gives you the best outcome — factoring in rate, fees, flexibility, and whether the lender can actually do what you need.
L A R G E L O A N U N D E R W R I T I N G
What Actually Changes Above £1m
Borrowers often assume that large-loan applications are fundamentally different from standard mortgages. In practice, the mechanics are the same — income, affordability, credit, property — but the emphasis shifts.
Underwriting Scrutiny
At large loan sizes, underwriters look more closely at the sustainability of your income rather than just the headline figure. A £300k bonus in one year isn't the same as three years of £200k to £250k bonuses. Lenders want to see that your income is repeatable, not a one-off spike.
For partnership income, they'll examine the structure of your firm, the stability of your drawings, and the trajectory of your profit share. For carried interest, they'll typically exclude it entirely from affordability and focus on salary and bonus. For contractor income, they'll want a track record of renewals and a clear day-rate calculation.
Property Valuation and Survey
At higher property values, lenders are more cautious about valuation. They'll often instruct a surveyor from a specialist panel rather than relying on an automated valuation model (AVM). For properties above £2m to £3m, a full RICS building survey may be required rather than a standard mortgage valuation.
Unusual property types — listed buildings, properties with large acreage, non-standard construction, or new-build high-value apartments — can present challenges at any loan size, but at £1m+ the lender's exposure means they're less willing to take a view on marginal cases.
Source of Funds and AML
Larger deposits and larger loans trigger more detailed source-of-funds checks. If your deposit comes from savings, you'll need bank statements showing the accumulation. If it comes from a gift, the giftor will need to provide evidence. If it comes from the sale of another property, overseas assets, or investment realisations, expect a paper trail.
This isn't a barrier — it's a process. Having your documentation ready from the outset avoids delays at a stage where they can be costly, particularly in competitive purchase situations.
D O C U M E N T A T I O N
Documents You’ll Need
Large-loan underwriting is documentation-led. Having the right paperwork ready before you apply can be the difference between a smooth approval and weeks of back-and-forth. Here's what to prepare depending on your income structure.
Employed (PAYE) with Bonus
Latest three months’ payslips
Including any payslip showing bonus or variable pay credited
P60s for the last 2 years
Confirms total earnings including bonus across full tax years
Bonus confirmation letter or contract clause
Confirming bonus structure, frequency, and whether it is discretionary or guaranteed
Bank statements showing bonus credits (2 years)
Evidence that bonus payments were received — lenders cross-reference these against payslips and P60s
Partnership / LLP Income
Tax calculations (SA302) — last 2 years
These replace payslips and P60s for LLP partners. Lenders use these to assess total income
Tax year overviews — last 2 years
From HMRC, confirming that the SA302 figures match what was submitted
Partnership agreement or income allocation letter
Confirming equity status, current drawings level, and profit share allocation
Firm accounts or profit share confirmation
Certified by your accountant. Some lenders require full accounts; others accept an accountant’s certificate
Bank statements showing income receipts
Showing drawings and profit distributions credited to your personal account
Contractor / Day Rate
Current contract
Showing day rate, duration, and client name
Previous contracts showing renewal history
Demonstrates continuity of engagement — lenders look for a track record of renewals
SA302s and tax year overviews
Required if operating via a limited company. Last 2 years where available
Accountant’s certificate or company accounts
Last 2 years of company accounts. Some lenders accept an accountant’s certificate as an alternative
Foreign Currency Income
Payslips in original currency
Lenders need to see the gross and net figures in the currency you’re paid in
Employment contract showing currency denomination
Confirms the currency of payment and any contractual exchange arrangements
Bank statements showing FX receipts
Showing income arriving in foreign currency or converted into GBP
P60 or overseas tax equivalent
Confirms total annual earnings. Overseas equivalents accepted by most lenders that take foreign currency
Deposit & Source of Funds
Bank statements showing deposit accumulation
Or evidence of a gifted deposit — larger deposits at £1m+ trigger more detailed source-of-funds checks
Gift letter from donor
With the donor’s bank statements and ID confirming the source and that no repayment is expected
Sale proceeds documentation
If deposit comes from the sale of another property — completion statement and solicitor confirmation
Overseas transfer evidence
For funds arriving from abroad — FX conversion trail, originating bank statements, and transfer confirmations
Interest-Only Repayment Strategy
Investment portfolio valuations
If investments are the repayment vehicle — showing current value, asset allocation, and liquidity. Must be within 12 months
Pension fund valuations and projected retirement income
Lenders typically credit only 25% of the current fund value for repayment purposes
Bonus or profit share history
If using periodic overpayments as the repayment strategy — evidence of consistent payments over 2+ years
Property valuation
If sale of property is the repayment plan — ownership evidence, current value, and equity calculation
W H O T H I S A P P L I E S T OWhich Professionals Use Large Loans?
Large loan structures are relevant across all six of the professions we work with, though the use cases and cash patterns differ. Start with the guide below that matches your role.
Lawyers & Law Firm Partners
Partnership income, variable profit share, and newly qualified associates buying in London — we know which large-loan teams treat LLP income most favourably.
View guide →
Investment Banking Professionals
Bonus-heavy income, USD compensation, sign-on packages, and deferred awards. The difference between using 50% or 100% of your bonus is often £500k+ in borrowing power.
View guide →
Private Equity Professionals
Carried interest is almost always excluded from affordability. We structure large loans around salary and bonus today, with flexibility to accelerate repayment when carry crystallises.
View guide →
Hedge Fund Professionals
Variable performance-linked income and year-on-year earnings volatility require careful lender selection. We present your compensation in the format each lender’s affordability model treats most favourably.
View guide →
Trading & Investment Professionals
Base salary is often a fraction of total compensation. Large-loan affordability depends on how bonus history is evidenced and which lenders’ calculators can capture it.
View guide →
Tech & Product Leaders
RSUs, stock options, and equity vesting schedules create periodic income events. We structure large mortgages around vesting timelines and identify lenders that treat equity compensation as assessable income.
View guide →
R E L A T E D G U I D E S
Explore related guides
Interest-Only Mortgages for High Earners
When interest-only makes sense, how part & part works, repayment strategy requirements, and LTV caps by lender
Bonus Income Mortgage Guide
How lenders assess annual and quarterly bonuses, which banks count 100% vs 50%, and how to position your application
Equity Compensation Mortgage Guide
How UK mortgage lenders assess RSUs, stock options, deferred stock, carried interest, and other equity compensation
Offset Mortgages for Professionals
How offset structures work, who offers them, and why they suit professionals with tax reserves or irregular cash flow
Private Bank Mortgage Guide
When bespoke underwriting justifies the premium, AUM requirements, relationship lending, and how private bank onboarding works
A R T I C L E SArticles on large mortgage loans
C A S E S T U D I E SHow we've helped clients with large loans
F A Q sFrequently Asked Questions
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In many cases, yes. Several mainstream lenders offer enhanced income multiples of up to 5.5x for qualifying professional profiles, and some will stretch to 6x where overall affordability supports it. Private banks assess holistically rather than applying a fixed cap, so the effective multiple can be higher where assets and income stability are strong. The achievable multiple depends on your income structure, outgoings, credit profile, and the property itself — we model this on the first call.
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No. Most large mortgages are placed with high street lenders through their dedicated large-loan teams. Private banks make sense when you need flexibility that mainstream lenders can't offer — very high LTV at scale, fully bespoke income assessment, asset-based lending, or a revolving credit facility. Our default is high street if it fits, because the rates and fees are lower. We'll always show you both options where relevant so you can make an informed decision.
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At 75% LTV (25% deposit), you'll access the widest range of lenders and the best pricing. Several mainstream lenders will lend up to 85% at large loan sizes for qualifying profiles, and a small number will consider 90% for borrowers with strong income and clean credit. For a £1.5m property, that means deposits ranging from £150k (90% LTV) to £375k (75% LTV) depending on which route you pursue.
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Yes, and how it's assessed makes a significant difference. Some lenders average your last two years of bonus, others use the lower of the two, and some will accept 100% of the latest year with a track record. On a £200k bonus, the gap between lenders using 50% and 100% translates to roughly £500k in additional borrowing. We match your bonus profile to the lender that treats it most favourably.
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Full interest-only means you pay only interest each month — the capital balance doesn't reduce. Part & part splits your mortgage into a repayment portion (which reduces over time) and an interest-only portion (which stays level). Part & part is far more common and more widely available from mainstream lenders. Both require a credible repayment strategy for the interest-only element.
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Yes, though lenders apply a haircut to foreign currency income — typically reducing it by 10 to 25% before running affordability. The variation between lenders is significant: one might use 75% of your USD salary, another 90%. On a £200k income, that's over £100k difference in borrowing power. We work with all major lenders accepting foreign currency and know which offers the most favourable treatment for each currency.
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From submitting a full application to receiving a formal mortgage offer, most large-loan applications take 3 to 6 weeks with a mainstream lender. Private banks can be faster for straightforward cases where the relationship is already established, but can take longer for complex structures requiring credit committee approval. Having all documentation ready from the outset is the single biggest factor in keeping things on track.
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We charge a broker fee for our advice and arrangement service. Our fee structure is published on our website. In our experience, the difference in rate, structure, and borrowing power that specialist placement delivers more than covers the cost — particularly at large loan sizes where small differences in rate or income treatment translate to significant sums.
W H Y U S E A B R O K E RHow Kite Mortgages Structures Large Loans
We place large mortgages across the full market — from high street large-loan desks to private banks and specialist lenders. For each case, we model affordability across multiple lenders, identify which route and structure delivers the best outcome, and manage the application through to completion. At large loan sizes, the right lender selection and income positioning routinely unlocks tens of thousands of pounds in additional borrowing or saves thousands per year in interest. That's what specialist placement means in practice.