On or about 29 Jan 2022, the Inland Revenue Authority of Singapore (IRAS) has updated the website content with regards to make changes after filing the original Income Tax Return, i.e., re-file via myTax Portal.
After filing
After a taxpayer have filed his or her Income Tax Return online at myTax Portal, he or she may re-file once within 7 days of his or her previous submission or by 18 Apr 2022, whichever is earlier.
After receiving your tax bill
When a taxpayer disagree with his or her tax bill, he or she may file an amendment using the “Object to Assessment” digital service at myTax Portal within 30 days from the date of your Notice of Assessment.