In Singapore, the due date for corporate tax e-filing is typically November 30th of the Year of Assessment (YA) for most companies.  However, do keep in mind that each company is required to file an ECI within 3 months of  the end of its financial year.   Please note that tax filing deadlines can vary based on the specific YA and any extensions granted by the Inland Revenue Authority of Singapore (IRAS). Do speak with our tax consultant to confirm the exact due date for a particular tax year.