MoneySavingExpert.com, which was set up by Lewis in 2003 and now sends a weekly email to around five million subscribers, is to be bought by price comparison website MoneySupermarket.
Lewis, who is well known as a television pundit on money matters, will receive £60m upfront in a mixture of cash and shares and a further £27m conditional on meeting targets over the next three years.
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Hide AdHe plans to donate £10m to charity from the deal, including £1m to Citizens Advice, while he will retain full control over the website.