TDS related activities - Would like to know the practice related to these functions in various organizations?

NamitaKruger
In an organization where HR and Finance are different functions handled by different teams and team heads, who would be responsible for the following activities related to TDS on salary:

1. Collection of investment declarations and subsequently investment proofs from the employees
2. Filing of quarterly TDS returns

Would like to know the practice related to these functions in various organizations where HR and Finance are handled separately.
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