Martin Lewis urged people to fill in their tax self assessment form as soon as possible.
The consumer champion issued the advice on last night's edition of Money Show Live. The first episode of the year was an annual bill-busting special as he provided financial tips amid the ongoing cost-of-living crisis.
The final segment of the show tackled news you can use and Martin urged people to be aware of the upcoming tax self assessment deadline on January 31. He said: "If you miss it, you get a £100 fine and if you don't pay on time then you can also be charged interest on late payments."
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The 50-year-old explained the form usually only applies to the self-employed, high earners or those with complex situations. However, he warned anyone who has been sent one must fill it in before the deadline at the end of month.
He said: "If you have been sent one, even if you don't think you should have, you have to fill it in and ask them not to send you once again next year."
Martin urged applicable people to "do it now" to avoid any trouble. He added: "Do not leave these to the last minute. There are reports from MPs that the HMRC helpline is clogged and taking a long time to answer. The later you leave it, the more risk you won't be able to get your questions answered and the more you're going to miss that deadline."
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