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According to the popular consumer site, more than two million people claimed the money back from the government last year - something you can still do if you haven't already.
But after the new tax year began earlier this week, workers are now able to claim tax relief for 2021-2022 as well, making a total saving of up to £250 altogether.
In the weekly Money Saving Expert newsletter, Lewis' team explained they had received official confirmation of the extra refund, saying: "Need to work from home, even for a day? We've just had it confirmed you can claim tax relief for ALL of 2021/22 (as well as the last tax year).
"We spotted HMRC had updated its site late on Tue to make this possible, and after pushing, we got official confirmation. Essentially, if your employer requires you to work from home, even for a day, you are eligible for a whole year's worth of tax relief.
"This is a special pandemic rule that was introduced for the 2020/21 tax year (which ended on Mon) but has been extended for 2021/22."
The newsletter says that millions of people claimed the money for the 2019/2020 tax year, and that if you haven't done so already you're still able to.
"If you're eligible for both years, the total gain is up to £250," it adds, advising people to check out Lewis' Working-from-home tax back blog for pros, cons, to find out who's eligible and for general help.
The rebate is worth £62.40 for basic rate tax payers, and £124.80 for those on higher rates.
To claim, you won't need any receipts - just access to a government gateway account, which you can set up as part of the process if you need to with your National Insurance number and either a recent payslip, a P60 or a valid UK passport.
The government website explains that people cannot claim tax relief if they choose to work from home, but may be able to do so for 'additional household costs if you have to work at home on a regular basis' either for all of part of the week.
"Additional costs include things like heating, metered water bills, home contents insurance, business calls or a new broadband connection," it explains.
"They do not include costs that would stay the same whether you were working at home or in an office, such as mortgage interest, rent or council tax."
Find out more here.
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