Product UpdatesBuilding Sheldon's State Tax Engine: 98% on TaxCalcBench
Deterministic rule engines for California, Illinois, New York, and Virginia - 620 of 630 scored lines on TaxCalcBench, every gap a documented benchmark defect.

Free Feather for CPA students, and trial extensions.
Welcome back to Feather Pulse. Two updates this week: free Feather for CPA students, and trial extensions.
CPA candidates get Feather for free while they study for the exam. Sign up with a .edu email, or contact us to verify student status. Full account, no credit card.
If your trial is ending, you can now request an extension. We review each request and get back to you.
The main app sidebar now links to Resources. Tax guides, blog posts, and reference docs are one click away without leaving Feather.
That's all for this week. New here? Try Feather free, see pricing, or subscribe to the Feather Tax Brief for weekly IRS guidance. Take care!
Product UpdatesDeterministic rule engines for California, Illinois, New York, and Virginia - 620 of 630 scored lines on TaxCalcBench, every gap a documented benchmark defect.
Product UpdatesA deterministic tax calculator built on a dedicated knowledge base and AI-generated rules - and how it went from 50% to 190/190 on TaxCalcBench.
Product Updates

Written by Sokratis Vidros
Published on June 29, 2026