InvoiceNow Mandatory by Apr 2031: Singapore GST Invoicing for Founders
Singapore invoice guide: required GST fields (9%), the 2026 InvoiceNow rollout, plus a technical onboarding checklist for foreign founders.
Published: 7 November 2025 · Last reviewed: 4 May 2026 · Reviewed by Ray Tay, Co-Founder & Managing Director, VIVOS PTE. LTD. (ACRA Filing Agent FA20240323 · MOM EA Licence 24S2425)
Singapore invoice guide: required GST fields (9%), the 2026 InvoiceNow rollout, plus a technical onboarding checklist for foreign founders.
A Singapore company paying its Hong Kong sister company must withhold 15% on interest and 10% on royalties, and file and pay that tax to…