Fund a tax bill without selling.

You can fund a tax bill without selling shares by borrowing against them. A Lombard loan advances cash secured on your portfolio, so you meet the deadline without selling into a bad market, crystallising a further gain, or disturbing a concentrated position — and repay when it suits. It carries interest and market risk.

The timing problem a tax bill creates

A tax bill is unusual among liabilities in that its timing is not yours to choose. The amount is fixed and the deadline is fixed, but the assets that could pay it may be exactly the ones you would rather not sell on that date — a concentrated founder holding, a portfolio in a temporary drawdown, or shares you intend to keep for years. Selling to fund tax can also compound the problem: disposing of appreciated shares to pay one bill can crystallise a further capital gain, adding to next year’s liability. The result is a timing mismatch — cash due now, assets you want to hold — and that mismatch is precisely what a Lombard loan is built to solve. None of what follows is tax advice; it is a description of how the financing works.

How a Lombard loan pays the bill without selling

The mechanic is simple. You pledge your portfolio, or a listed holding within it, as collateral. The lender advances cash against a fraction of its market value, and you use that cash to pay the tax authority by the deadline. The shares are not sold — they remain yours, pledged as security — so no disposal occurs and no further gain is crystallised by the act of raising the money. You meet the deadline on time, keep the position and its upside, and repay the loan later, on your own timetable. This is the same instrument that substantial holders have long used to keep capital invested while meeting near-term cash needs, described in our note on how the wealthy borrow against stock, applied here to the specific, dated need of a tax bill.

Common scenarios

The pattern — cash due before you want to, or are able to, sell — recurs in several familiar situations.

Self-assessment and income-tax bills. A large income-tax or self-assessment liability can fall due at a moment when liquid cash is scarce but a securities portfolio is ample. Borrowing against the portfolio meets the payment without disturbing the underlying investments or their timing.

Estate and inheritance liquidity. Inheritance or estate tax is often due before the estate’s assets — shares, property, a business interest — can be sold or distributed, and in some regimes must be settled before assets can be transferred. A Lombard loan against marketable securities in the estate can provide the liquidity to pay on time and avoid a forced sale of assets the family would prefer to keep.

Tax on exercising options or an exit. Exercising share options, or a partial exit, can trigger a tax charge well before the underlying shares are sold or freely tradable. Where the resulting shares are marketable, borrowing against them can fund the tax due on exercise; where they are not yet marketable, the constraints on restricted stock apply and a different structure may be needed. In each of these cases, the financing simply buys time between a fixed obligation and the moment you choose to realise the assets.

Speed and repayment

Once the collateral is identified and the documentation and custody are in place, a Lombard facility can usually be arranged quickly — a real advantage when a deadline is close. Repayment is flexible: the loan can be cleared from a later, better-timed sale, from dividends or other income, from a bonus or a liquidity event, or refinanced if that suits. The borrower controls the timing of repayment in a way they simply cannot control the timing of the tax. That asymmetry — pay the fixed deadline now, repay on your own schedule — is much of the appeal.

The trade-offs and risks

A Lombard loan is neither free nor without risk. Interest accrues on the drawn amount for as long as the loan is outstanding, so a facility left in place for years is a real, compounding cost. And because the loan is secured on securities, it carries market and margin risk: if the pledged collateral falls in value, the loan-to-value rises, and the borrower may face a margin call — a demand to post more collateral or repay part of the loan — and, in a severe fall, a forced sale of the collateral. Understanding that risk is essential before borrowing, and it is set out in full in our note on Lombard loan margin-call risk. Prudent sizing — a conservative loan-to-value with genuine headroom — is what keeps a tax-funding loan comfortable rather than fragile.

When it fits, and when to just sell

Borrowing to fund tax fits when you want to keep the shares, when selling would crystallise a further gain you would rather defer, or when the market is a poor place to sell on the deadline. It fits especially well for concentrated or illiquid positions you are not ready to reduce. It fits less well if you were going to sell those shares anyway, if the embedded gain — and so the tax cost of selling — is small, or if you would be uncomfortable carrying debt and margin risk against your portfolio. In those cases, selling to pay the bill is simpler and cleaner. The fuller comparison of selling against borrowing sits in our guide to borrowing against shares without selling, and the instrument itself is set out in the guide to the Lombard loan. None of this is tax advice; how a bill arises, and how it is best met, depend on your own residence, domicile and circumstances, and should be confirmed with your adviser.