IR35 – Reform of off-payroll working rules (known as IR35) postponed until 2021 TAX – If you run a business or are self-employed and are concerned about paying your tax due to coronavirus, you can call HMRC's new helpline for help and advice: 0800 0159 559 HR – If you have cover with our HMRC Tax Enquiries/Investigation Service you can call the helpline displayed on your Confirmation with any employment law questions. If you have misplaced the Confirmation, and need the number, please email us. ACAS also have useful information on their site Please also see: Our previous guidance Information for businesses and employers