Who is required to file Form 15CA ?
As per Rule 37BB, any person responsible for paying to a non-resident, not being a company, or to a foreign company, any sum chargeable to tax under the provisions of Income tax Act, 1961, shall furnish such information in Form 15CA and Form 15CB​:

In case the payment or the aggregate of such payments made during the financial year does not exceed Rs. 5 lakh rupees, such information is to be furnished in Part A of Form No.15CA.
In case the payment exceeds Rs. 5 lakh such information is required to be furnished in Part B of Form No. 15CA after obtaining a certificate from the Assessing Officer under section 197; or an order from the Assessing Officer under sub-section (2) or sub-section (3) of section 195.
In case the payment exceeds Rs. 5 lakh such information is required to be furnished in Part C of Form 15CA after obtaining certificate in Form No.​15CB from an accountant as defined in the Explanation to sub-section (2) of sectio​n 288.
In case the payment other than the payment referred in sub-rule (3) of Rule 37BB which is not chargeable to tax under the provisions of Income tax Act,1961, such information is required to be furnished in Part D of Form No. 15CA.