In an advisory to taxpayers, the department's TDS (Tax Deducted at Source) Centralized Processing Cell (CPC) told assessees that their "user ID and password are the most sensitive information, misuse of which can lead to tampering of confidential TDS-related information, your own sensitive data, and deductee-related confidential information".Don't share your user ID and password with anyone,they too will be liable to face consequences,said Income Tax Department.