Cash ISA limits are set to be slashed from their current £20,000 per year to just £12,000, unless you’re over 60.

But there is a little-known way that you can significantly boost your Cash ISA limit in any given year, money expert Martin Lewis has revealed.

Martin returned with a new episode of The Martin Lewis Money Show Live on Tuesday, February 10 in which he fielded questions about money in marriage in particular.

There, he explained there is a way to massively increase your Cash ISA allowance in the unfortunate event that your husband, wife or civil partner dies and leaves the money behind.

Martin had set out during the ITV1 episode that marriage or civil partnership brings several financial benefits, including the ability to avoid Inheritance Tax on any money you leave to your spouse.

Martin was then asked by a viewer what happens if you have money in your Cash ISA and you die, and whether it can be left to your spouse too.

Not only did Martin confirm that you can leave a Cash ISA to your husband or wife, but that they can also boost their annual allowance by inheriting it.

Martin then replied: “Yes, but even more so. There is a special rule on death that says existing ISAs can be passed on to your spouse, so imagine your spouse has £30,000 in an ISA, you can apply to add this to your allowance.

“So you now have an extra £30,000 ISA allowance. And that happens even if you are not the beneficiary of the money.

“So let’s say the £30,000 went to the kids, you can still apply to increase your allowance by £30,000.

“So it’s a big yes to that one.”

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The Cash ISA limit is set to be cut to £12,000 from April 2027. The overall allowance will still be £20,000, but you will only be able to pay in £12,000 into a Cash ISA in a single tax year, while the other £8,000 must be in stocks and shares ISAs instead.

The rule will not apply to over-65s, who have been granted a special exemption and can still put £20,000 into a Cash ISA each year.

The Martin Lewis Money Show Live from February 10 is still available to watch via ITVX.