Changing how to pay my tax

Hello, I am employed full time and self-employed part time. I started my business in April 2020 as a sole trader and completed my self-assessed tax return for the first time last year. At the time, I selected to have my tax on self-employment taken from my employed wage via a change in tax credits for the next financial year. Is it possible to change this and pay my tax as a lump sum instead? I haven't been able to find an option for this on the HMRC website.

Hi,
 

If you make payment directly to SA, and then contact us 5 days after the payment, we can review the tax code. See link: Self Assessment: general enquiries    . Thank you.