Can I be both self-employed and have an LLC?

Hello, I'm currently self-employed offering therapy as well as freelance writing services. I have a new freelance client who wants me to create an LLC through which they can pay me. Is it possible to set up an LLC and only use it to be paid by that one client? And keep the rest of my activities as self-employed for the time being? Until I figure out the best way of doing things long term? So file a tax return for the LLC as well as a self-employed one for the rest of my activities. Thanks in advance for any input, Ben

Hi Ben Tannahill,
Please see the below guidance:
Set up a limited company: step by step
If you require further advice on this matter, please seek professional help through a financial advisor or accountant.
Thank you.