A Singapore company files an Estimated Chargeable Income within three months of its financial year end, files Form C-S, C-S (Lite) or C by 30 November, and must register for GST once taxable supplies exceed S$1 million. These guides explain which form applies, the exemptions available, GST registration and returns, and how to respond to IRAS.
Start with these guides
- Form C-S vs Form C-S (Lite) vs Form C: Which Singapore Tax Return Should Your Company File (2026)
- How to Plan Your First Corporate Tax Season as a New Company
- Startup Tax Exemption (SUTE) Singapore 2026: The First Three Years Explained
- YA 2026 CIT Rebate and Cash Grant: Who Qualifies, How Much and Worked Examples
- Common Corporate Tax Mistakes SMEs Make and How to Avoid IRAS Penalties
- How to Respond to an IRAS Query or Review Letter Professionally
- IRAS Court Summons for Unfiled Corporate Tax Returns: What Company Directors Face
- Withholding Tax (Section 45)
- Transfer Pricing Documentation in Singapore 2026: Who Must Prepare It and What It Must Contain
- How to Apply for GST Registration: Step‑by‑Step Process
- Pros and Cons of Voluntary GST Registration for SMEs in Singapore
- How to Prepare and File Your GST Returns Accurately and On Time
- GST Record‑Keeping Requirements and How to Stay Ready for an IRAS Audit
- GST Filing Services in Singapore: What a Quarterly GST Service Should Cost and Cover in the InvoiceNow Era
Our tax services
Tools: Form C-S eligibility checker, corporate tax calculator, GST registration checker. Official source: IRAS.
Talk to our team
For help with corporate tax and GST, email [email protected] or WhatsApp us at +65 8501 7133. Our office is at 151 Chin Swee Road, Manhattan House, #02-04A, Singapore 169876, open Monday to Friday, 10am to 6pm.