New figures out this week show around 109,000 people are on track for a tax bill over £10,000 on their savings interest in 2026-27 — up from just 28,000 four years ago. That’s not a new tax. It’s the same tax, quietly biting harder every year because the thresholds that trigger it haven’t moved while interest income has. And my take: this is exactly the kind of change that catches small business owners off guard, because it never looks like a decision anyone made.
Frozen thresholds are a stealth tax by design — there’s no announcement, no rate change to notice, nothing that shows up in a Budget headline. It just quietly pulls more people over the line each year as balances and interest rates do the work instead. If you’re a sole trader or director who keeps a decent cash buffer sitting in a savings account — sensible, prudent, exactly what any accountant would tell you to do — you are precisely the person this creeps up on, because the advice to hold reserves hasn’t come with a matching warning about what those reserves now cost you at tax time.
The counterpoint is fair enough: nobody’s savings income is being singled out, and the rules haven’t technically changed — you can argue this is just “more people earning more, therefore paying more.” But that framing lets everyone off the hook a little too easily. A near fourfold jump in four years isn’t drift, it’s a trend, and treating it as unremarkable is exactly how it stays unremarked on.
So here’s the opinion, stated plainly: if you hold business or personal cash reserves in savings, checking where you sit against the tax-free savings allowance should be a routine part of your year-end review, not something you find out about from a headline after the fact. Nobody is going to flag it for you.
Has this actually shown up on your radar, or is it still filed under “not my problem”?
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