The Tax Stack AI platform, including the research assistant that answered federal and state tax questions with citations to the IRC, Treasury Regulations, and IRS guidance, closed on September 8, 2026. We are no longer taking new accounts or subscriptions.
We now build custom AI systems for accounting and tax firms — including bespoke research assistants, document analysis tools, and multistep agentic workflows — designed around how your firm actually works and deployed in your own environment.
Custom research tools
Built for your firm's practice areas and sources.
Secure, local deployment
Runs in your environment, under your control.
Existing customer with a billing or data question? Email taxstackai@gmail.com.