YC Summer 2026 (S26) company

Rational

First Zero-human Accounting Firm

About Rational

Rational is building the first accounting firm with no humans. It's entirely run by our AI employees, who go from client intake to doing the books to filing with the IRS. We secure 90% cost reduction, 24/7 support, and an overall seamless experience for businesses.

Public traction evidence

Each signal links to the public source used for attribution.

  1. X

    Imagine saying no to customers (and revenue) because you can’t keep up with the work.

    Imagine saying no to customers (and revenue) because you can’t keep up with the work. In accounting, 300k professionals have left the field & 3 out of 4 could retire by 2030. To solve the talent shortage, we develop AI employees that help accounting firms say yes to growth.

  2. X

    We just launched the future of accounting work as part of @ycombinator's S26 batch.

    We just launched the future of accounting work as part of @ycombinator's S26 batch. Reach out if you're an accounting firm leader looking to adopt AI at scale and grow your revenue. https://t.co/AN97THVrQe

  3. YouTube

    Rational - Launch

    Visit rational.to/book-demo to stop saying no to business growth.

  4. X

    "Go to your customers." At 19, as part of @ycombinator s26, I've been the youngest in the room at conferences spanning LA to DC in the accounting and tax field.

    "Go to your customers." At 19, as part of @ycombinator s26, I've been the youngest in the room at conferences spanning LA to DC in the accounting and tax field. Here are some pics.

  5. YouTube

    Rational Launch

    Embedded in the official Rational YC company page.