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If you've been forced to work from home, Martin said HMRC has confirmed to him that claims can be made if you've been pinged by Test and Trace.
The money is there to help with the extra costs of working from home, such as increased energy bills because you're using more power while at home during the day.
The money isn't issued up front, however. But if you are able to claim, your tax code will be adjusted so you're paying less.
"HMRC has specifically confirmed to me that claims from employees working at home due to coronavirus measures, if their usual workplace is closed, count for this relief," said Martin.
"The same also applies if you have to work from home because you've been told to self-isolate by NHS Test and Trace, or because you're self-isolating having been pinged by the NHS app."
The tax relief can be claimed even if you've only worked at home for one day. So far, HMRC has received more than 3 million claims.
How much you get off will all depend on the rate of tax you're paying. You can even claim for last year if you were forced to work from home during 2020, meaning you can essentially claim back £250.
Your employer must have required you to work from home, for you to be able to claim.
You can find out more and make a claim here.
To claim, you'll need a few bits of information including a Government Gateway user ID and password. If you don't already have a login, you can set one up - you'll just need your National Insurance number, a recent payslip or P60 or a valid UK passport.
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