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Thank you for your question. As you know a Tier 4 visa allows you to work to supplement you income or to take up a work placement relevant to your studies. Being in business or being self employed is not permitted however and you will be in breach of your visa conditions were you to do so. I hope that answers your question. Please leave a positive rating so that I am credited for my time. I've found the guidance notes for you. See page 66: https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/540421/T4_Migrant_Guidance_July_2016.pdf