Frequently asked questions

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Operating hours:

  • 8am to 5pm for Mondays to Fridays (except Public Holidays)
  • 8am to 1pm for Eve of Christmas, New Year and Chinese New Year


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Helpline operating hours:

  • Mondays to Fridays: 8am to 5pm (Avoid peak hours from 11.30am to 2pm)
  • Saturdays, Sundays, and Public Holidays: Closed
  • Eve of Christmas, New Year and Chinese New Year: 8am to 1pm

In line with our efforts to continuously improve our helpline services, conversations over the helpline may be recorded for our quality monitoring and coaching purposes.

Corporate Income Tax Matters Contact Number
Estimated Chargeable Income
Filing of Form C-S/ Form C-S (Lite)/ Form C
General Payment Matters
1800 356 8622 for local calls
(+65) 6356 8622 from overseas
Late Filing/ Payment Matters
(e.g. Letters on reminder to file/ pay, penalties for late filing/ payment)
1800 356 8622 for local calls
(+65) 6356 8622 from overseas
Other Enforcement Actions
(e.g. Letters on Court Summons, appointment of bank/ tenants as agents for payments)
(+65) 6356 7012

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For added security, you may email us via myTax Mail in myTax Portal using your Singpass, IRAS Unique Account (IUA) or Corppass.

For non-confidential enquiries, please select the relevant form: