Borrowing against your investment portfolio genuinely offers a fast, tax-efficient way to raise capital – but around 7% of investors have experienced a margin call at some point, rising to 23% among investors under 35. Understanding both the genuine appeal and the real risk before you commit matters more here than with most other forms of borrowing.
Why This Route Genuinely Appeals
Borrowing against your portfolio rather than selling avoids crystallising a Capital Gains Tax liability immediately, and keeps you invested through any subsequent market recovery rather than exiting your position entirely. For someone confident in a holding’s long-term prospects, or facing a large tax bill on disposal, this can be considerably more capital-efficient than selling outright.
A Genuine Worked Example of the Risk
Consider an investor pledging a £10 million portfolio to borrow £6 million at 60% loan-to-value. If equity markets fall 20%, the portfolio drops to £8 million – but the loan remains at £6 million, pushing the effective loan-to-value to 75% and breaching the lender’s agreed threshold. At this point, the lender can issue a margin call, requiring you to top up collateral or reduce the loan quickly. If you can’t respond fast enough, the lender may liquidate assets to restore balance, often at exactly the depressed values you’d least want to sell into.
Why You Lose Control at the Worst Possible Moment
This is genuinely the part many borrowers underestimate: during a forced liquidation, you have no say over which specific holdings are sold or when. Lenders typically sell whatever covers the shortfall fastest, which can mean triggering Capital Gains Tax on your best-performing positions while your declining holdings remain untouched – the opposite of what you’d choose yourself.
Why More Conservative Sizing Genuinely Matters
The single most effective way to avoid ever facing a margin call is borrowing meaningfully below the maximum loan-to-value your lender would technically offer, rather than maximising the facility. A loan sized conservatively against your portfolio’s genuine volatility gives you real breathing room during a market downturn that a maximised facility simply doesn’t.
Stock Loans and Lombard Facilities: The Standard Routes
Our Stock Loans page covers borrowing against listed equities specifically, while our Lombard Loans page covers a genuinely broader structure, secured against a wider mix of equities, bonds, and funds together – diversification across asset types within a Lombard facility can itself help reduce the risk of a single-sector downturn triggering a margin call.
Crypto-Backed Loans: A Genuinely Higher-Volatility Version
Our Crypto-Backed Loans page covers borrowing against digital assets specifically, worth understanding as a genuinely higher-risk category within securities lending overall, given how much more volatile crypto holdings typically are compared with listed equities or bonds – loan-to-value on crypto collateral is set considerably more conservatively as a direct result.
Who This Genuinely Suits
Securities lending tends to suit investors with substantial, genuinely diversified portfolios who need liquidity for a specific purpose – a property purchase deposit, a business opportunity, or bridging a temporary cash need – without wanting to disturb a long-term investment position. Our High Value Mortgages page covers a common pairing, where a stock loan funds part of a deposit alongside conventional property finance for the remainder.
Who This Genuinely Doesn’t Suit
If your portfolio is concentrated in a single volatile holding, if you’d genuinely struggle to find additional funds quickly in the event of a margin call, or if you’re borrowing right up to your maximum available loan-to-value with no buffer, this route carries meaningfully more risk than it’s worth for most people’s circumstances. It’s worth being honest with yourself about which category you fall into before proceeding.
Why Private Banking Relationships Often Suit This Best
Our Private Bank Mortgages page covers the genuinely relationship-based approach many private banks take, which can offer more flexibility around margin call terms and collateral top-up arrangements than a purely transactional lender – worth considering if your circumstances and portfolio size genuinely qualify for this route.
Getting the Sizing and Structure Right
Given how much genuinely depends on your specific portfolio’s composition, volatility, and your personal comfort with the risk involved, it’s worth having a proper conversation about conservative sizing before committing to any facility, rather than borrowing the maximum a lender is willing to offer. Get in touch with details of your portfolio and objectives, and we’ll help you understand whether securities lending genuinely suits your circumstances.
