Martin Lewis fan gets £9,400 tax refund by doing a simple check – here’s how

A MARTIN Lewis fan has got a £9,400 tax refund by doing a simple check - and you can do it too.

You could be owed hundreds - or in some cases thousands - of pounds from the tax man if you've accidentally overpaid.

, who discovered they were on the wrong tax code for three years.

The reader said that her tax code hadn't been updated by her employer - so she was still being taxed as though she was self-employed.

"It took an hour on the phone to HMRC, but I've now been refunded £9,400," she said.

We explain how to check your tax code - and what to do if you're on the wrong one.

to view your tax code.

What if I think it's wrong?

You can check if your tax code is correct by using or .