UPDATE (March 26th 2020): The phone number has changed to 0800 024 1222
HMRC has a set up a phone helpline to support businesses and self-employed people concerned about not being able to pay their tax due to COVID-19.
The helpline allows any business or self-employed individual who is concerned about paying their tax due to Coronavirus to get practical help and advice. Up to 2,000 experienced call handlers are available to support businesses and individuals when needed.
For those who are unable to pay due to Coronavirus, HMRC will discuss your specific circumstances and explore the options available.
The helpline number is 0800 0159 559, and is in addition to other HMRC phone contact numbers.
Opening hours are Monday to Friday 8am to 8pm, and Saturday 8am to 4pm. The helpline will not be available on Bank Holidays.
You can read the full story here