I have received my tax bill, but I disagree with the income assessed and the deductions given.

You may file your objection to the assessment using the 'Amend Tax Bill' digital service at myTax Portal. Regardless of any amendment request, your tax balance must be settled immediately. IRAS will review your request and inform you of the outcome accordingly. If there is any tax overpayment resulting from the amended tax bill, IRAS will refund you within 30 days from the date of your new tax bill. For faster processing, please register for PayNow FIN.
Refer to Making changes after filing/receiving tax bill for more details on amendment to income/relief.
This information is sourced from IRAS
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