Income Tax rates in Singapore:
http://www.mof.gov.sg/taxation/indiv...tax_rates.html
You can also apply for 'Not Ordinarily Resident' scheme. See
http://www.iras.gov.sg/irasHome/page03.aspx?id=6118
Provided you have not lived in Singapore for 3 consecutive years you can apply for NOR status and you will be charged tax at a flat rate of 10% on your taxable income for a period of 5 years. It works out overall at about 7.5%, as a portion of your income is tax free as it is earned outside Singapore and is designed to cover down route expenses.
Not really worth applying for as an F/O as you need to earn about $190k pa for it to become worthwhile.