Tax Capital Gains · Borrowing vs Selling

Does borrowing against shares trigger capital gains tax?

Borrowing is not selling. A Lombard loan raises cash while deferring the tax a disposal would crystallise — general information, not tax advice.

Insight 11 July 2026 Isabelle Chappuis

Generally, no — borrowing against shares does not itself trigger capital gains tax, because you are not disposing of the assets. A Lombard loan lets you access cash while deferring any CGT that selling would crystallise. Tax treatment depends on your jurisdiction and circumstances, so this is general information, not tax advice.

Key takeaways

Borrowing against shares is not a disposal, so it does not by itself trigger capital gains tax.
A Lombard loan lets you raise cash while deferring the CGT that selling the same shares would crystallise.
This is general information, not tax advice; treatment depends on your jurisdiction, residence, and circumstances.
A forced sale of pledged shares on a margin call is a disposal, and can create a CGT charge.
For the broader tax treatment of Lombard loans, see the dedicated note and take professional advice.

The short answer

The short answer is that borrowing does not, in itself, trigger capital gains tax. Capital gains tax is charged on a gain you make when you dispose of an asset; pledging that asset as security for a loan is not a disposal, because you neither sell it nor part with ownership. A Lombard loan is a pledge, not a sale, so the act of borrowing against your shares leaves your capital gains position untouched. That is precisely why borrowing appeals to a holder sitting on a large unrealised gain: it releases cash now while leaving the eventual tax question for another day.

This note addresses only that narrow point — borrowing versus selling. For the wider picture, the firm’s note on the tax treatment of Lombard loans covers the subject more fully, and neither note is a substitute for advice from your own tax adviser.

Why a loan isn’t a disposal

Capital gains tax attaches to a disposal. A disposal is, in essence, a change of ownership: a sale, a gift, an exchange, or another transaction that passes the asset to someone else. When you pledge shares under a Lombard facility, none of that happens. You remain the owner; the pledge simply grants the lender a security interest that can be enforced only if you default.

You continue to hold the shares, generally continue to receive dividends and exercise voting rights subject to the facility terms, and you recover the collateral free of the pledge when you repay. Because there is no change of beneficial ownership, there is no disposal, and with no disposal there is nothing to crystallise a gain. The unrealised gain in the position stays unrealised, and stays deferred, for as long as you hold rather than sell.

UK CGT: borrowing vs selling

For a UK taxpayer the distinction is stark. Selling shares to raise cash is a disposal for capital gains tax, and a chargeable gain on the sale can fall due, reducing the net cash the sale actually delivers. Borrowing against the same shares is not a disposal, so it does not of itself produce a CGT charge; using the shares as loan security does not count as disposing of them. The practical effect is that a Lombard loan can deliver spendable cash today without the tax leakage a sale would suffer, leaving the position, and its deferred gain, intact.

This is general information rather than advice, and it describes the mechanism, not your personal position: rates, reliefs, allowances, and the interaction with your other affairs are matters for a qualified adviser and for HMRC’s rules as they apply to you. We deliberately do not state tax rates here, because the numbers that matter are the ones that apply to your circumstances.

Borrowing vs selling: a worked comparison

The difference is easiest to see in cash terms. Suppose you need £500,000, and you hold listed shares carrying a large unrealised gain. The comparison below sets out what each route requires, and deliberately states no tax rate — the point is the mechanism, not a figure that depends on your circumstances.

	Sell shares to raise £500,000	Borrow £500,000 (Lombard loan)
Is it a disposal?	Yes — a chargeable disposal for CGT.	No — the shares are pledged, not sold.
Shares parted with	More than £500,000 of stock, because part of the proceeds is lost to tax on the embedded gain.	None; the pledged shares are recovered in full on repayment.
Unrealised gain	Crystallised now, at the rate that then applies.	Deferred while you continue to hold the shares.
Position afterwards	Reduced — the sold shares, and their future upside, are gone.	Intact — economic exposure, dividends, and votes retained, subject to structuring.
Cost carried instead	The tax on the gain, and any cost of buying back later.	Interest on the drawn amount for the term of the facility.

The trade is a real one: a sale ends the tax question but also ends the position, while a Lombard loan keeps both open and carries a financing cost in the meantime. Whether the deferred tax and retained upside outweigh that cost is a judgement for your own circumstances and your adviser. This is a general illustration, not tax advice, and no tax rate is assumed.

Cross-border and Swiss considerations

Tax is territorial, and the answer can shift with residence and the location of the assets. Many jurisdictions share the basic principle that a loan is not a disposal, but they differ widely on how they tax the eventual sale, on how they treat interest, and on reporting. A borrower who is resident in one country, holds shares listed in another, and borrows through an institution in a third should map the position across all of them before acting.

Switzerland, where the firm is based, is a notable case: as a general rule, private capital gains on movable assets such as listed shares are not taxed for Swiss-resident private investors, though other taxes, including wealth tax, apply and the outcome depends on status and facts. The firm’s note on Lombard loans in Switzerland discusses the Swiss setting further. None of this is advice, and cross-border tax in particular rewards proper professional input.

Interest deductibility, briefly

Whether the interest on a Lombard loan is tax-deductible is a separate question from capital gains, and the answer depends entirely on your jurisdiction and on what the borrowing is for. Some regimes allow interest to be set against investment income where the loan is used for investment purposes; many do not allow relief for interest on borrowing put to private or personal use. Because the rules are specific, conditional, and easy to get wrong, this note does no more than flag the question. The general treatment of costs and interest is taken up in the broader tax treatment of Lombard loans note, and the deductibility of your interest is a point to settle with your tax adviser, not from a web page.

When tax could still arise

Deferral is not the same as exemption, and there is one route by which a Lombard loan can lead to a tax charge: a sale of the collateral. If the value of the pledged shares falls far enough to breach the agreed loan-to-value and the shortfall is not cured, the lender can sell some of the shares to reduce the loan. That sale is a disposal like any other, and it can crystallise a capital gain and a tax liability, at a time not of the borrower’s choosing. It is a further reason to borrow with headroom rather than to the maximum, and to treat the loan-to-value as a risk control rather than a target; the mechanics are set out in the note on margin-call risk.

Equally, when you eventually choose to sell the shares, the deferred gain becomes a real one and is taxed under the rules that then apply. The Lombard loan defers the question; it does not answer it. For the full treatment, and before you act, read the tax treatment of Lombard loans and take professional advice.

Written by

Isabelle Chappuis

Head of Structuring, Lombard Financing

Isabelle leads credit and collateral structuring at Lombard Financing, with a focus on loan-to-value calibration, recourse design, and pledge documentation across European and cross-border facilities.

Structuring · Loan-to-value · Collateral · Pledge documentation

Published 11 July 2026 · Updated 26 July 2026

Continue Related insights

Tax and borrowing, answered.

Q · 01Does borrowing against stock trigger capital gains tax?

Generally no. Capital gains tax is charged when you dispose of an asset, and borrowing against your shares is not a disposal because you keep ownership of them. A Lombard loan pledges the shares as security rather than selling them, so it does not by itself crystallise a gain. This is general information and not tax advice, and the position depends on your jurisdiction and circumstances.

Q · 02Is a Lombard loan tax-free?

The borrowing itself is not a taxable event, but that is not the same as being tax-free. A Lombard loan defers rather than removes tax: the unrealised gain in your shares stays deferred while you hold them, and can become taxable when you eventually sell. Interest, wealth taxes, and local rules may also apply. Treat this as general information and take professional advice.

Q · 03Can I deduct the interest?

It depends on your jurisdiction and on what the loan is used for. Some tax regimes allow interest to be deducted where the borrowing is for investment purposes, while many give no relief for interest on personal borrowing. The rules are specific and conditional, so whether your interest is deductible is a question for your tax adviser. This is general information, not advice.

Q · 04Does a margin-call sale create a tax bill?

It can. If the collateral falls in value and a margin call is not cured, the lender may sell some of the pledged shares. That sale is a disposal, and it can crystallise a capital gain and a tax liability at a time you did not choose. It is one reason to borrow with headroom rather than to the maximum. As ever, this is general information rather than tax advice.