You can only start charging Goods and Services Tax (GST) after you have submitted your Form GST F1 (Application for Goods and Services Tax
Frequently Asked Questions : Singapore GST
If I fail to register and did not collect any Goods & Services Tax (GST) from my customers, will my GST registration still be backdated?
Yes. You will be required to account for and pay the Goods & Services Tax (GST) on all your taxable supplies made from the date that you should be
Does Singapore have any value added tax or Goods & Services Tax (GST)?
The Goods & Services Tax (GST) rate in Singapore is 9% (w.e.f. 1st January 2024).