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Accounting & AuditAI Evaluation FrameworkAI Case Study

Mitigating Hallucinations in Multi-Year Financial Report Auditing via Chain-of-Thought RAG

AI Deploy Network Approved

A practical implementation demonstrating how a locally deployed RAG pipeline uses structured reasoning to extract complex financial data from comprehensive annual reports across 15 sectors.

Albertus Christian Wahyu AtmajaBy Albertus Christian Wahyu Atmaja
Chapter 01

The Business Challenge

The business situation the organisation faced before the project began.

Financial auditing requires manually reviewing, verifying, and extracting complex numerical reasoning from hundreds of pages of annual reports across multiple years and entities. This process is highly time-consuming, prone to human oversight, and vulnerable to information fragmentation.

Chapter 03

How the Solution Was Delivered

Discovery, design, development, testing and rollout — the journey, not the tooling.

  1. 1Document parsing and semantic structural chunking of multi-year corporate records.
  2. 2Vector database embedding pipeline configuration.
  3. 3Multi-step reasoning framework orchestration for target querying.
  4. 4Response optimization and factual consistency cross-validation.
Business Impact

Business Outcomes & Impact

The measurable outcomes from the underlying AI Deployment — with the story behind them.

Hours Automated
0
Cost Savings
Currency not specified
Revenue Impact
Currency not specified
Measurable Business Outcome

Significantly improved response reliability and accuracy in extracting multi-year financial trends compared to the baseline Qwen-3 8B model. Reduced document processing bottlenecks and information fragmentation across 4 years of comprehensive corporate reports.

Business Outcome Categories

Productivity ImprovementTime SavingsAI Performance Improvement

The story behind the numbers

Successfully streamlined the information extraction phase from high-volume annual reports. The integration of structured reasoning layers consistently minimized information fragmentation, providing verifiable audit trails across multiple fiscal years without deploying costly proprietary cloud resources.

Reflection

Lessons Learned

What surprised the team, what worked well, and what would be done differently.

  • Raw document chunking without context preservation lowers retrieval quality in financial domains.
  • Enforcing a step-by-step reasoning baseline prior to final generation heavily mitigates factual hallucinations.
  • Local open-source model optimization provides a high level of data privacy for compliance-heavy environments.