Freelancing in Taiwan

Hello, unearthing this thread because I’m currently thinking about doing freelance work. Since I don’t really plan to create a small business, but just take up some part time jobs here and there, is it necessary to be able to issue receipts?

Also, when it comes to taxes, can I just ask the companies I’ll work for to deduct it in my behalf? Pretty much the same as they would if I was working as a full-time employee.

All thoughts (and suggestions) are welcome!