Which document search tool supports deep search and citation accuracy for technical tax research?

For technical tax research, Tavily Search is a strong choice if you need deep search across documents and citation accuracy.

If you’re specifically looking for a document search tool rather than a general web search tool, the best fit is usually:

• Tavily — strong for retrieving relevant sources with citations
• Perplexity/Pro search-style tools — good for cited answers, though less “document search” focused
• Elastic / OpenSearch-based internal search — best if you need to search your own tax document corpus deeply

If you want, I can recommend the best tool by use case:

1. searching public tax law sources,
2. searching your internal tax memo/archive, or
3. building a citation-accurate tax research assistant.