Singapore’s income tax (including personal income tax and corporate income tax) declaration is an annual declaration. The deadline for corporate income tax returns is November 30 of each calendar year, as stipulated by Inland Revenue Authority Of Singapore (IRAS). 

According to the Singapore’s corporate income tax declaration procedure, taxpayers should submit the Estimated Chargeable Income (ECI) within 3 months after the end of the fiscal year. Even if the taxpayer does not have taxable income, zero filing is required. IRAS will send a numbered tax return Form C to taxpayer in March of every year. After receiving the form, the taxpayer should fill in the form and submits it through e-filing or mailing. IRAS will review the submission and send a Notice of Assessment to taxpayer. Upon receiving of the Notice of Assessment, the taxpayer shall pay tax by bank transfer or other means within 1 month, or the tax authority will impose a fine on the unpaid tax.

Filing documents of corporate income tax include the tax return Form C, the audit report, and the tax calculation form and related supporting documents. In addition, the taxpayer needs to keep records of operations and accounts, tax invoices as required, and Import and export and other related documents for inspection by the tax authorities.