Incorrect refund claims could lead to high tax bills.

Almost 300,000 more than the first tax day of 2018.

Move by HMRC follows increase in basic interest rate.

Lifting of restrictions means workers may not qualify this year.

Financial support could be available for you.

Prices increase by nearly 10% in 12 months

Higher inflation expected to bring more people into tax.

Increase attributed to COVID-19 and rising house prices.