The due date for filing corporate tax return in Singapore is November 30 annually. The tax return is filed on a prior year basis i.e. any financial year end fall in 2016 will need to file tax return for the financial year on 30 November 2017. The filing deadline is extended to 15 December, if the company is e-filing the tax return.
However, each company is required to file an Estimated Chargeable Income (ECI) within 3 months of the end of its financial year to IRAS.