Singapore Income Tax Calculator
Income Tax calculators for Individuals, Businesses, GST, Property, etc are conveniently provided by the Inland Revenue Authority of Singapore (IRAS) on its website.
Below is a snapshot of a Personal Income Tax Calculator in Excel format.
Source: https://www.iras.gov.sg/irashome/Quick-Links/Calculators/
In addition to Tax Calculators, IRAS also provides applications to check eligibility for various tax reliefs and compute liabilities.