The estimated average salary for a Customer Service Associate (CSA) at Firstsource Solutions is ₹52,619 per year or ₹25 per hour, but some professionals have reported earning up to roughly ₹83,547 per year (90th percentile). The typical pay range is between ₹41,555 (25th percentile) and ₹67,330 (75th percentile) annually. This is based on 235 salaries submitted by Firstsource Solutions Customer Service Associate (CSA) professionals on Glassdoor, as of Jun 2026.