AI-Powered Chat Interface for a Large-Scale TAX Knowledge Base

1. Client & Project Context

Our client, a leading provider of tax intelligence services, operated a subscription-based knowledge portal containing 25,000+ articles covering global TAX regulations. Subscribers received tailored content updates based on changes in tax regulations relevant to their region and industry. The existing platform functioned well as a traditional web-based knowledge repository, where users manually searched and read through lengthy articles.

However, during a strategy workshop, we explored how the user experience could be transformed to provide faster, more intuitive access to tax knowledge. The conclusion: integrating a chat-based AI assistant to allow users to ask direct tax-related queries rather than browsing through articles manually.

2. Challenges

• Feeding 25,000+ articles directly into an LLM would result in poor answer quality and excessive costs.
• We needed a way to dynamically retrieve relevant knowledge without overloading the model.

Ensuring Accuracy, Compliance & Traceability

• LLM-generated responses had to be fully aligned with verified knowledge—no hallucinations.
• Users needed direct references to the original tax articles for validation.
• Compliance requirements dictated auditable, explainable AI responses.

Continuous Quality Control

• The system had to maintain high relevance, accuracy, and understandability over time.
• A human-in-the-loop feedback mechanism was needed to fine-tune outputs and prevent model drift.

• We embedded all 25,000+ TAX articles into a vector database, enabling semantic search for highly relevant content.
• When a user submits a query, the system retrieves the top-matching articles before sending them to the LLM for processing.

Context-Aware LLM Responses with Full Traceability

• Instead of generating responses purely from its own knowledge, the LLM was only fed retrieved, verified content.
• Responses included:
  A direct answer to the user’s question.
  A link to the source article with highlighted sections where the answer was found.
  A compliance disclaimer, advising users to consult a tax expert for validation.
• This approach eliminated hallucinations, ensured compliance, and built trust in AI-generated responses.

Continuous Quality Control with AI & Human Feedback

• Automated Response Scoring:
  We integrated DeepEval to score responses based on understandability, relevance, and compliance.
• Human-in-the-Loop Review:
  Certain answers flagged as high-risk or uncertain were manually reviewed by tax domain experts.
  This reinforced response accuracy and continuously fine-tuned the system.

Guidelines & Guardrails to Prevent AI Misuse

• We implemented guardrails that:
  Prevent hallucinated responses by restricting LLM access to only retrieved content.
  Limit response length and format to ensure clarity.
  Detect and filter irrelevant or inappropriate queries.