In order for you to register your company for company income tax you need to to submit the following documents to SARS in person or online
Company registration documents
Certified copy of your ID document
Letter from the bank to confirm your bank account
Proof of residence, which would normally be a original municipal account, or a certified copy of your lease agreement.
Normally when a company registers with CIPC a company income tax number is issued automatically
ABOUT COMPANY TAX
Most new companies registered at the Companies Commission (CIPC) get issued with a Company Tax number automatically, and this number is normally emailed to you.
Company income tax returns is due at SARS within 12 months after the financial year end and is submitted via e filing.
Provisional Tax Returns are submitted twice per year during the relevant financial year, on these returns you need to make an estimate of your taxable income and pay company income tax to SARS based on these estimates.