Can you borrow against a stocks & shares ISA?

Generally, no — you cannot borrow against a stocks and shares ISA. The rules that govern the wrapper prohibit using the investments held inside it as security for a loan, so an ISA cannot be pledged in the way a Lombard facility requires. You can, however, borrow against an unwrapped portfolio held in a taxable general investment account. This is general information, not tax or financial advice.

The short answer

The short answer is that a stocks and shares ISA cannot, as a rule, be used as security for borrowing. An ISA is a tax wrapper, and the tax advantages that make it attractive come with conditions on how the account may be used. One of those conditions is that the investments held inside it may not be pledged as collateral for a loan. A Lombard loan works precisely by taking a pledge over a portfolio, so the two do not meet: there is no way to borrow against the assets while they remain inside the wrapper.

This does not mean a holder of ISA investments has no route to liquidity — only that the route does not run through the ISA itself. It runs through whatever portfolio a borrower holds outside the wrapper, and that distinction is the whole of the matter. This note is UK-specific and offered as general information; it is not tax or financial advice.

Why an ISA can’t be pledged

An ISA is a shelter, and the shelter is conditional. The rules that grant a stocks and shares ISA its freedom from tax on gains and income also restrict what the account holder may do with the investments inside it, and using those investments as security for a loan is not permitted. The prohibition is not a lender’s preference but a feature of the wrapper: the assets are meant to sit undisturbed within the account, not to be encumbered by a charge in favour of a third party.

A Lombard loan cannot bridge that gap, because it depends on a valid pledge of the collateral. Attempting to pledge ISA investments would, at best, be ineffective and, at worst, jeopardise the wrapper’s tax status — the very advantage the ISA exists to provide. That is why portfolio-backed lenders will not lend against holdings that remain inside an ISA, and why the honest answer to the question is a plain one. As always, this is general information; the detail of how the rules apply to you is a matter for your own adviser.

What you can borrow against instead

What a Lombard loan can be secured on is an unwrapped portfolio — listed shares, funds, and bonds held in an ordinary, taxable general investment account rather than inside a tax shelter. Assets held that way can be pledged, and against that pledge a lender advances cash equal to a fraction of the portfolio’s market value, while ownership, income, and upside stay with the borrower. The instrument is set out in full on the Lombard loans page, and the way to raise cash without a disposal is the subject of the note on borrowing against shares without selling.

How much can be raised is the loan-to-value, calibrated to the collateral rather than set by a rate card. A diversified, liquid book supports a higher advance than a single concentrated holding; illustratively, advances run from around 20% to 65% of value. The drivers, and an illustrative range-by-collateral table, are covered on how much you can borrow against shares.

Selling ISA shares vs borrowing elsewhere

Faced with the wrapper’s restriction, a holder who needs cash has two broad choices, and they are not equivalent. The first is to sell investments held inside the ISA. Within the wrapper a sale does not trigger capital gains tax, which is one of the ISA’s real advantages, but it does something more permanent: money taken out of the account generally loses its sheltered status, and the ISA allowance used to shelter it cannot simply be reclaimed. Selling to raise cash therefore shrinks the shelter, not just the portfolio.

The second is to leave the ISA untouched and borrow against an unwrapped portfolio held elsewhere. That keeps the sheltered investments where they are and raises liquidity against assets that can properly be pledged. Where the unwrapped holdings carry an embedded gain, borrowing rather than selling also defers the capital gains tax a sale would crystallise — the subject of the note on borrowing against shares and capital gains tax. Which route is right depends on the size and shape of the holdings on each side, and on advice specific to the holder.

If most of your wealth is in an ISA

Honesty requires a plain statement of where this leaves a particular kind of holder. A Lombard facility suits substantial unwrapped holdings; it is not a way to unlock an ISA. If the greater part of your investable wealth sits inside stocks and shares ISAs built up over many years, and little is held outside them, there may simply be too little pledgeable collateral to support a meaningful facility. Years of diligent ISA saving can produce exactly that position, and there is no structuring trick that turns sheltered assets into pledgeable ones.

For a holder with a large unwrapped portfolio alongside the ISA, the picture is different, and a facility can be arranged against the unwrapped assets while the ISA is left to do its work. Lombard Financing arranges these facilities by introduction and for substantial holders; where the unwrapped collateral is modest, the candid answer is that a Lombard loan may not be the right instrument. None of this is tax or financial advice, and the right course turns on figures and circumstances that only your own adviser can weigh.