To prepare GST-registered businesses for the second rate change whenthe GST rate is increased from 8% to 9% with effect from 1 Jan 2024,this guide explains the general transitional rules applicable totransactions spanning the second rate change. It covers the time ofsupply rules, the GST rates chargeable and provides information on theissuing of invoices, credit notes and other requirements.
Source: iras.gov.sg