The estimated average salary for a CSA - Customer Service Associate at Firstsource Solutions is ₹51,868 per year or ₹25 per hour, but some professionals have reported earning up to roughly ₹75,144 per year (90th percentile). The typical pay range is between ₹43,413 (25th percentile) and ₹63,218 (75th percentile) annually. This is based on 235 salaries submitted by Firstsource Solutions CSA - Customer Service Associate professionals on Glassdoor, as of Jun 2026.