The Inland Revenue Authority of Singapore announced on 14 February 2018 the revised method to determine the GST registration threshold for the purpose of compulsory GST registration.
Under the existing rule, a person must register GST under the retrospective basis if his taxable turnover at the end the calendar quarter (i.e. 3 months ending Mar, Jun, Sep or Dec) and the past three quarters is more than $1 million.
For periods on or after 1 Jan 2019, taxable turnover will be computed on a calendar year basis for the purpose of determining registration liability. The person will have to monitor at the end of every calendar year (i.e. 31 Dec) and register for GST if his annual taxable turnover exceeds $1 million.