Government Guidance

Government portal: https://www.gov.uk/topic/business-tax/ir35

Check Employment Status for Tax (CEST): https://www.gov.uk/guidance/check-employment-status-for-tax

Employment Status: https://www.gov.uk/government/collections/employed-or-self-employed

Prepare for the changes in 2021: https://www.gov.uk/guidance/prepare-for-changes-to-the-off-payroll-working-rules-ir35

Rules for agencies: https://www.gov.uk/guidance/off-payroll-working-for-agencies

Fee-payer responsibilities: https://www.gov.uk/guidance/fee-payer-responsibilities-under-the-off-payroll-working-rules