How do we know the bracket of income tax we will belong to for 2021? (Let’s take 2021 for sake of discussion since it’s the filing period is already here for 2020’s taxes)?

The income tax bracket have not change since 2017... I doubt it will change anytime soon and then again if change... The newspaper, media, social media, your colleagues, your frens and family members will share with you.
#planwithcolin

This is the income tax rate from YA 2017 onwards: https://www.iras.gov.sg/irashome/Quick-Links/Ta...

Should there be a revision, the Authority will inform us accordingly.

I share quality content on estate planning and financial planning here.