PII Detection for Indian Businesses: Aadhaar, PAN, GSTIN Compliance Guide

Indian businesses processing personally identifiable information (PII) through AI applications face a unique challenge: global PII detectors do not recognize India-specific identifiers. An Aadhaar number, PAN card, or GSTIN passes through standard content filters unnoticed, creating compliance and data protection risks.

This guide covers India-specific PII types, regulatory requirements, and how to implement detection and redaction for AI applications serving Indian users.

India-specific PII types your AI must handle

Aadhaar (12-digit identifier)

Aadhaar numbers follow a 12-digit pattern with a Verhoeff checksum. They appear in customer support conversations, document uploads, and KYC verification flows. Under the Aadhaar Act, storing or processing Aadhaar numbers without proper safeguards can result in penalties.

PAN (Permanent Account Number)

PAN is a 10-character alphanumeric identifier (format: AAAAA9999A). It is widely shared in financial transactions, invoice processing, and employee records. PAN is sensitive financial data under income tax regulations.

GSTIN (Goods and Services Tax Identification Number)

GSTIN is a 15-character alphanumeric identifier based on PAN. It appears in B2B invoices, vendor management systems, and compliance workflows. Disclosure of GSTIN can reveal business relationships and transaction patterns.

UPI IDs and handles

UPI handles (e.g., user@bank) are widely used for payments in India. They appear in transaction histories, payment requests, and customer communications. UPI IDs can be linked to bank accounts and mobile numbers.

Indian mobile numbers

10-digit mobile numbers are a primary authentication factor for many Indian services. They frequently appear in AI training data, customer transcripts, and support tickets.

IFSC codes

Bank branch identifiers used in domestic wire transfers. Often included in invoice processing and payment workflows handled by AI.

Regulatory landscape

Digital Personal Data Protection Act (DPDPA) 2023

India's comprehensive data protection law requires:

• Consent-based processing of personal data
• Purpose limitation — data used only for stated purpose
• Data minimization — collect only what is necessary
• Breach notification within 72 hours
• Cross-border data transfer restrictions

Sectoral regulations

• RBI: guidelines for financial data processing and outsourcing
• IRDAI: data protection requirements for insurance
• SEBI: cybersecurity framework for market participants
• MeitY: AI governance guidelines and advisory

Implementing India PII detection for AI

Detection at input

Scan every user input before it reaches your AI model. If Aadhaar, PAN, or other India PII is detected, redact it before sending to the model. This prevents sensitive data from being processed or stored by third-party AI providers.

Detection at output

AI models can inadvertently generate or reproduce PII in their responses. An output guard checks the model's response before delivering it to the user, redacting any India-specific identifiers that appear.

Detection in documents

For RAG applications, scan uploaded documents for India PII before indexing. Flag or redact sensitive content so it is not surfaced in retrieval results.

See how SoterAI detects and redacts India PII across inputs, outputs, and documents with real-time performance.