For the first time, money held in an ISA is set to be taxed. From April 2027, the Treasury plans to introduce a 22 per cent charge on the interest earned on cash held inside a stocks and shares ISA. It is a significant moment for a product that millions of people use precisely because it has always been simple and tax-free.
The change does not stand alone. It arrives at the same time as a cut to the cash ISA allowance, announced in last November's Budget, which will fall from £20,000 to £12,000 a year for savers under 65. The investment ISA allowance stays at £20,000, a deliberate nudge to push more savers towards the stock market.
The new charge is an anti-avoidance measure. With less room in a cash ISA, the worry in the Treasury is that savers will simply park the rest of their allowance as cash inside a stocks and shares ISA, where, under today's rules, the interest is tax-free. The charge is designed to close that door. Full details are still being finalised by HMRC.
What it actually means, and what it does not
It is worth being precise, because the headlines invite an over-reaction. This is a charge on cash interest held inside a stocks and shares ISA. It is not a tax on your investment gains, which remain tax-free for now.
The catch is that holding some cash inside an investment ISA is completely normal. It happens when money has been paid in but not yet invested, when someone is waiting out a volatile market before committing, or when a portfolio holds cash-like money market funds. Savers doing this for entirely sensible reasons would be caught alongside anyone trying to sidestep the cash ISA cap.
As Rachael Griffin of wealth manager Quilter put it, applying a flat charge to interest means investors "will simply receive a reduced net return regardless of their personal tax position, effectively introducing a consistent haircut across cash holdings". HMRC has also yet to confirm whether portfolios made up entirely of money market funds, which typically hold short-dated government bonds, will be penalised in the same way.
A frosty reception
The reaction from the financial industry has been blunt. Jason Hollands of investment platform BestInvest said the move "undermines the tax-free promise of ISAs", calling it "like using a sledgehammer to crack a walnut". Simon Harrington of the Personal Investment Management and Financial Advice Association described the measure as "draconian", adding complexity to the ISA regime "with little to no evidence that consumers will behave as these measures assume".
The criticism is partly about the money and partly about the message. ISAs work because they are easy to understand. Every new rule, cap and carve-out makes them harder to navigate, at exactly the moment policymakers say they want cautious savers to feel confident taking their first steps into investing.
Where gold fits in
None of this makes an ISA a bad home for your money. For most people, a stocks and shares ISA remains one of the most sensible ways to invest. But the steady erosion of the tax-free promise is a fair reason to look again at how tax-efficiently you hold your wealth overall, and at assets that sit outside the wrapper rules entirely.
UK legal-tender gold coins are one such asset. Coins like the Gold Britannia and the Sovereign are produced by the Royal Mint and carry a face value, which makes them legal tender. Two consequences follow:
- No Capital Gains Tax. Because they are legal tender, any gain on these coins is exempt from CGT, however large it grows. There is no allowance to use up and nothing to report.
- No VAT. As investment-grade gold, they are free of VAT to buy.
There is no annual cap on how much you can hold, and the new 22 per cent interest charge has nothing to bite on, because physical gold pays no interest in the first place.
That last point cuts both ways, and honesty matters here. Gold pays no income and no dividends; its role is to store value, not to generate yield. It is not free of Inheritance Tax, because it stays within your estate. Physical gold is an unregulated investment, it is not covered by the Financial Services Compensation Scheme, and its value can fall as well as rise. It is one tool for holding wealth tax-efficiently, not a replacement for an ISA or a pension.
What it offers, at a time when the tax rules around savings are becoming more complex, is a treatment that is unusually simple: a tangible asset you own outright, free of CGT and VAT, outside the ISA system and its changing rules.
The takeaway
The April 2027 changes are a reminder that tax-free is a promise governments can revise. Spreading how and where you hold your wealth, rather than relying on a single wrapper, is sound thinking in that light. For some savers, a modest allocation to physical, legal-tender gold is part of that picture.
If you would like to understand how the tax treatment of gold coins works, our free Gold Investment Guide explains it in plain English, with no obligation.
This article is for information only and is not financial or tax advice. Bullion Club is not authorised or regulated by the Financial Conduct Authority. Physical gold is an unregulated investment and is not covered by the Financial Services Compensation Scheme. The value of investments can go down as well as up and you may get back less than you invested. Tax treatment depends on individual circumstances and may be subject to change.
