The off-payroll working rules IR35 changed on 6th April 2021. If you supply contractors who work through their own limited company this may affect you. HMRC have more information here: https://www.gov.uk/guidance/help-and-support-for-off-payroll-working?&utm_source=t.co_hmrcgovuk&utm_medium=social&utm_campaign=ir35&utm_content=support
Source: https://twitter.com/HMRCgovuk/status/1385549355604746240?s=20