The documents required for SIP MF are:-
A. Identity proof: PAN card,
B. An address proof: Driving licence/bank statement/utility bill
C. A passport size photograph and
D. Your bank account cheque book. The cheque book will come handy to provide your bank details.
E. Confirm your present existence through an In-person verification (IPV)
For more details visit Kotak Mutual Funds website, you can find details there.