Once you are liable to register, you are required to inform the Comptroller for Goods & Services Tax (GST) within 30 days from the date your
Frequently Asked Questions : Singapore GST
Can I charge GST if I am unable to submit the Form GST F1 on time?
You can only start charging Goods and Services Tax (GST) after you have submitted your Form GST F1 (Application for Goods and Services Tax
Does Singapore have any value added tax or Goods & Services Tax (GST)?
The Goods & Services Tax (GST) rate in Singapore is 8%.