Does anyone knows if one needs to pay income tax for doing side hustle(s)? If so, how much?

Depend on what is your side hustle. If is working for another acra registered company as employee and with cpf contribution, it will be reflected in your income tax auto. If is your own side business such as selling things on ecommerce and not an officially registered business, technically, it is up to individual whether to declare on personal tax.

It depends on how much are you earning from your side hustles for starters.

​

Can reference to this article by IRAS for more information:

​

Essential Tax Information for Gig Workers

https://www.iras.gov.sg/media/docs/default-sour...

Likely yes, and it depends on how much you earn in your normal job and in your side hustle.

I guess depends on your side hustle?