The Money Saving Expert founder has come up with a clever trick to dodge the upcoming law change, and it only costs £1 - which you won't lose, but will actually get back with interest on top.
He added you should do this because it gives you the chance to save tax free in the next two years, which you'll lose when the law changes next week. Speaking to his BBC Radio 5 Live listeners, Martin Lewis said: "16 and 17-year-olds consider putting £1 into a Cash ISA right now if they haven't already.
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