A buyer may hold substantial wealth in New York, Geneva, Dubai, Monaco or another financial centre while the property they want to acquire is in the UK. Cross-border securities-backed lending can sometimes bridge those two positions by using an eligible investment portfolio as collateral for borrowing, including borrowing in a different currency. [1] [2]
The attraction is obvious: the property purchase can be funded without an immediate disposal of investments. What is less obvious is that a cross-border facility introduces several additional underwriting questions. The borrower, lender, portfolio, custodian, currency and property may all sit in different legal or financial environments. A structure that looks straightforward from a balance-sheet perspective may therefore be unsuitable or unavailable once those details are examined.
For international families, family offices and globally mobile investors, the right comparison is usually broader than securities-backed lending versus a conventional mortgage. It may involve a portfolio-backed facility, a specialist UK property facility for Middle Eastern clients, a US-buyer mortgage solution, bridging finance, private-bank lending or a combination of structures.
What Cross-Border SBL Actually Changes
It changes the primary security. Instead of relying only on a mortgage over the UK property, the lender may take security over eligible investments. Weatherbys describes Lombard lending as borrowing against an investment portfolio and notes that, subject to review, externally held portfolios can sometimes be considered. [3]
It does not remove underwriting. HSBC describes tailored lending as an assessment of the client's debt structure, short- and long-term needs and suitable financing options. Cross-border private-banking services also remain subject to local law, regulation and jurisdictional availability. [2]
It can create a currency mismatch. UBS offers lending in major currencies and warns that currency movements can affect asset values and financing outcomes. Borrowing sterling against dollar or euro collateral may therefore solve the purchase-currency requirement while creating another source of risk. [1]
How Cross-Border Securities-Backed Lending Works
At its simplest, a lender advances money against an eligible investment portfolio and takes security over that portfolio. The borrower can then use the liquidity for a permitted purpose, potentially including property. UBS and Weatherbys both identify property as a potential use of portfolio-backed lending. The exact security arrangements, eligible assets and permitted uses vary by lender. [1] [3]
The cross-border element begins when the borrower, investments, lending entity or property are located in different jurisdictions. The fact that a banking group operates internationally does not mean the same facility is automatically available everywhere. HSBC expressly states that private-banking services are delivered by different group entities according to local law and that not all products are available in all jurisdictions. [2]
That makes lender selection more technical than simply comparing interest rates. Before relying on the facility for a property exchange or completion, the parties need clarity on who the lender will be, how security over the investments will be perfected, whether the existing custodian is acceptable and which currency the facility will use.
Why International Buyers Consider It
Liquidity without an immediate portfolio sale
One attraction is the ability to raise liquidity while remaining invested. Coutts describes investment-backed lending as a way to access funds against eligible investments while maintaining a longer-term portfolio strategy. This can be relevant where a property opportunity arises before the investor wants to sell securities. [4]
That does not mean borrowing is automatically more efficient than selling. Interest, fees, market risk and the borrower's eventual exit all need to be compared with the cost and tax consequences of a disposal. In the UK, HMRC notes that selling or otherwise disposing of certain shares and investments can create a Capital Gains Tax liability, depending on the circumstances. Overseas tax treatment may be entirely different. [5]
Matching the borrowing currency to the property purchase
An international buyer may hold assets in dollars or euros but need sterling to acquire a UK property. Some portfolio lenders can provide facilities in major currencies. That can remove the need to convert a large amount of investment capital at the point of purchase, but it does not eliminate foreign-exchange exposure. [1]
If the collateral is valued in dollars while the debt is in sterling, a move in GBP/USD can change the relationship between debt and collateral even where the underlying investments have not moved in their local currency. The appropriate structure may therefore be sterling debt, same-currency debt with a separate FX strategy, or another arrangement identified with the lender and the client's investment advisers.
Providing acquisition liquidity before long-term finance
Cross-border SBL can also be considered as temporary liquidity where the intended long-term solution is a mortgage or development facility. That can be useful where the property transaction has a short timetable but the long-term financing requires valuation, planning, income analysis or more extensive underwriting.
The important word is intended. Future refinancing should not be treated as guaranteed. A later UK mortgage or development finance facility will have its own criteria, valuation and legal process. The SBL needs to remain manageable if that exit is smaller, slower or unavailable.
Cross-Border Eligibility Is About More Than Portfolio Size
A £20m or £50m portfolio may look substantial, but the headline valuation does not tell a lender how much secure borrowing it can support. The lender will usually distinguish between assets it accepts readily, assets that attract a lower lending value and holdings it may exclude completely.
UBS lists major-market equities, investment funds, corporate and government bonds and cash deposits among the collateral it generally considers. Concentrated, illiquid, private or volatile positions may receive materially different treatment, depending on the lender. [1]
Can the Portfolio Stay With the Existing Wealth Manager?
Sometimes, but it should never be assumed. Weatherbys states that portfolios held elsewhere may be considered subject to review and eligibility. Other lenders may require the securities to be held with them or with an approved custodian before they will advance funds. [3]
This point is commercially important. A family office may be comfortable pledging assets but not moving the investment mandate, while the existing wealth manager may have its own restrictions concerning security interests, discretionary management or withdrawals. Those constraints should be identified before a property deadline makes them urgent.
The strongest structure is often one where the property adviser, lender, investment manager, tax adviser and legal advisers understand each other's role. Willow's job is to structure the borrowing and lender approach; it is not to replace the advice required on investment suitability, tax or legal enforceability.
Illustrative Example: Overseas Portfolio, UK Acquisition
Consider an illustrative family office with a €50m diversified portfolio held with a major Swiss custodian. It wants to acquire a £10m UK property and is considering £7m of portfolio-backed borrowing alongside £3m of cash. This is an example only, not a lending indication or a completed Willow transaction.
| Issue | What the Review Must Establish |
|---|---|
| Borrower | Which family-office entity or individual will borrow and whether the selected lender can serve that jurisdiction and legal structure. |
| Collateral | Which part of the €50m portfolio is eligible and what lending value the bank assigns to each holding. |
| Currency | Whether to borrow in sterling, euros or another currency and how changes in exchange rates affect the collateral position. |
| Custody | Whether the Swiss assets can remain where they are or need to move into an approved pledge or custody arrangement. |
| Property acquisition | Whether the lender permits the intended use of funds and when the money is genuinely available for completion. |
| Exit | Whether repayment comes from long-term property finance, other liquidity or an eventual asset sale, and what happens if that exit is delayed. |
If the intended exit is a later UK mortgage, the mortgage must be assessed independently. A mortgage lender will consider the property, borrower, ownership structure, source of deposit, existing liabilities and its own affordability and policy requirements. The securities-backed facility cannot be treated as evidence that the eventual mortgage will complete.
The Cross-Border Question Is Not Simply: “How Much Can I Borrow?”
A more useful question is: which lender can take security over these particular assets, lend to this borrower in the required currency, permit the proposed property transaction and provide terms that remain workable if markets or exchange rates move against us?
Currency Risk Can Work in More Than One Direction
Borrowing in sterling can appear logical when the property purchase is in sterling. However, if the collateral and the borrower's future cash flows are primarily in another currency, the loan introduces a foreign-exchange position that must be understood.
Suppose a dollar portfolio supports a sterling facility. If sterling strengthens materially against the dollar, the sterling debt becomes larger when translated back into dollars. At the same time, the lender may calculate collateral adequacy using its own currency and haircut methodology. The effect is specific to the facility, but the general point is straightforward: matching the loan to the property currency does not necessarily match the loan to the borrower's wealth.
UBS specifically warns that currency and interest-rate changes can reduce expected returns and asset values. Currency choice should therefore be part of the risk assessment rather than a convenience selected at drawdown. [1]
Margin Calls Remain the Central Credit Risk
The defining feature of securities-backed lending is that the value supporting the debt changes continually. If the pledged investments fall sufficiently, the lender may require additional collateral or repayment. UBS explains that it may liquidate pledged investments if a borrower cannot meet the required collateral or repayment obligation. [1]
FINRA's US investor guidance describes the same broad maintenance-call risk for securities-backed lines of credit and warns that securities can be sold if a borrower does not restore the required collateral. It is a US source and should not be read as UK law or as the terms of a particular international facility, but it illustrates why a borrower needs liquidity beyond the pledged portfolio itself. [6]
A property may be worth considerably more than the debt, but that does not necessarily help with an immediate portfolio collateral call unless the facility allows the property to be substituted or another lender can refinance in time. The structure should therefore be tested against a market fall before the borrower relies on the full available line.
Tax Efficiency Should Be Described Carefully
Avoiding an immediate investment sale can avoid an immediate disposal that might otherwise create a tax charge. For a UK taxpayer, HMRC states that a gain on the sale or disposal of certain shares or investments may be subject to Capital Gains Tax. [5]
That does not mean the loan itself creates a tax advantage, eliminates future tax or produces the same result in every country. An international investor may have tax obligations in more than one jurisdiction, and the later sale of investments, interest expense, trust structure, company ownership or transfer of funds can all have consequences. Cross-border SBL should therefore be coordinated with tax advice rather than marketed as a universal tax-saving strategy.
Trusts, Companies and Family Offices Add Another Layer
Cross-border wealth is often held through companies, partnerships or trusts rather than directly by an individual. That can be entirely compatible with tailored lending, but it increases the legal and governance work required. The relevant entity must have power to borrow, grant security and use the proceeds for the intended purpose, and the lender must be willing to lend to that structure.
HSBC's tailored-lending material specifically contemplates UHNW individuals, personal investment or operating companies and family trusts within bespoke borrowing arrangements. That does not mean every trust or company will qualify; it shows why entity structure belongs at the start of the financing analysis rather than being disclosed after terms are agreed. [2]
Cross-Border SBL Versus Other UK Property Finance
| Structure | Where It May Fit | Main Issue to Test |
|---|---|---|
| Cross-border SBL | Investor has eligible liquid securities and wants liquidity without an immediate sale. | Collateral, jurisdiction, currency and margin-call resilience. |
| Private-bank mortgage | Property debt can be assessed alongside the client's wider balance sheet and banking relationship. | Property underwriting, borrower profile, income and relationship requirements. |
| Specialist international mortgage | Buyer wants longer-term finance directly against the UK property. | Residence, income, ownership structure, deposit and lender policy. |
| Bridging finance | Time-critical property acquisition or short-term property-backed requirement. | Property security, cost and a credible exit within the facility term. |
| Development finance | Acquisition is followed by construction, heavy refurbishment or development activity. | Planning, costs, sponsor equity, delivery capability and exit. |
The best answer can involve more than one facility. A securities-backed line might support the initial acquisition while a longer-term UK property facility is arranged, or it may provide only part of the equity requirement while the main debt is secured on the property. The combination needs to be disclosed and assessed as one capital structure rather than a series of independent loans.
How Willow Private Finance Can Help
Willow Private Finance assesses cross-border securities-backed lending in the context of the actual UK property requirement. We consider the borrower's jurisdiction and ownership structure, the location and composition of the investment portfolio, existing custody arrangements, currency requirements, other liabilities, property transaction and intended repayment route before identifying the relevant lender universe.
Where SBL is appropriate, we can assess private-bank and specialist options and coordinate the borrowing discussion with the client's existing wealth manager, accountant, tax adviser and legal team. Where it is not the strongest solution, we can compare alternatives across securities-backed lending, specialist mortgages, bridging finance and development finance.
The objective is not simply to unlock the largest amount against a portfolio. It is to build a financing structure that remains workable after the property has completed, including if the collateral falls, currencies move or the intended refinance takes longer than planned.
Overseas Portfolio. UK Property Requirement. Start With the Complete Structure.
A cross-border SBL facility can be powerful when the lender, collateral, custody, currency and repayment strategy all align. Before committing to a UK purchase, establish which portfolios can support borrowing and how the facility behaves if markets move against you.
Willow Private Finance can assess securities-backed lending alongside specialist UK property finance so the borrowing is considered as part of the wider wealth position.
Explore Securities-Backed Lending →Frequently Asked Questions
Key questions for international investors, family offices and advisers considering portfolio-backed borrowing for UK property.
Can an overseas investment portfolio support borrowing for a UK property purchase?
Potentially. The lender must accept the borrower, jurisdiction, portfolio, custodian, currency and proposed use of funds. Cross-border eligibility is not automatic, even where the investments are substantial and liquid.
Can I borrow in sterling against investments held in another currency?
Some lenders offer borrowing in major currencies, but a mismatch between the loan and collateral currencies can increase risk. Exchange-rate movements can affect the value of collateral relative to the debt, so the currency structure should be tested rather than assumed to reduce risk.
Does cross-border securities-backed lending avoid UK mortgage affordability checks?
It is a different form of credit rather than an exemption from underwriting. The lender will assess the portfolio and may also review the borrower, purpose, repayment route, financial position and jurisdictional requirements. If a later mortgage is intended, that mortgage will have its own separate underwriting criteria.
Can investments stay with an overseas wealth manager?
Sometimes. Certain lenders can consider externally held portfolios, while others require assets to be held within their own custody or an approved arrangement. The position should be confirmed with both the proposed lender and existing wealth manager before the property transaction depends on the facility.
What happens if the overseas portfolio falls in value?
The lender may require additional collateral or repayment under the facility terms. If the borrower cannot meet that requirement, pledged investments may be sold. Currency movements can intensify the issue where the debt and collateral are denominated differently.