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Hi, Sam here , one of the UK tax Experts here on Just Answer, thank you for your question and I shall reply shortly
Im a bit confused as you say you are IN a job then state you are self employed - which is it ?
If truly self employed then you should register this with HMRC and then after 05/04/2020 you are asked to fill in a self assessment tax return and you declare your income and expenses and then the tax and national insurance you owe which you pay no later than 31/01/2021 -
You should be putting about 25-30% of your income away to cover tax and national insurance
if you work for just one company the likelihood is that you should be employed - can you tell me what sort of work you do - and what makes you feel you are truly self employed as there are strict laws on this under the employment status legislation but you can just ring HMRC and ask them what your UTR is (if you are meant to be self employed)
Then you are not self employed as none of your duties would be up to you how and when they are performed and you have just one client - you should have sent up a direct payment scheme to run your own payroll through for tax and national insurance purposes
so close down the self employment position (phone HMRC) and then phone the Employer helpline to set up a direct payment scheme see link here re legislation