You need to check and ensure that your income details and relief claims are accurate in your tax bill. If you have any other income that is not shown in your tax bill or if your relief claims (including those that are prefilled) are incorrect, please inform IRAS of any discrepancy through the 'Amend Tax Bill' digital service in myTax Portal using your Singpass or Singpass Foreign user Account within 30 days from the date of your tax bill.

This information is sourced from IRAS