Annual Corporate Tax Filing Timeline

All companies in Singapore must file their annual corporate income tax returns with IRAS. This involves two submissions:

1. Estimated Chargeable Income (ECI) — due within 3 months from the end of the financial year.

2. Form C-S or Form C — the actual corporate tax return, due by 30 November each year.

Companies with zero income or losses must still file unless specifically exempted.

Tip: Keep proper accounts throughout the year to make filing faster and reduce last-minute errors.
Official Reference: IRAS Corporate Income Tax Filing