Deduction

Deduction, operated by Treasur, Inc. (dba Deduction), is a New York-based financial technology company that positions itself as a tax firm in which software and licensed CPAs work together. Its product is Taylor, CPAI, described by the company as an AI tax accountant built for U.S. consumers rather than for accounting professionals. Taylor handles document collection and categorization, deduction and credit identification, tax calculations, drafting of federal and state returns, electronic filing, and year-round questions; licensed CPAs review high-impact decisions and sign off on every return before filing.

Users interact through call, text, chat, or email rather than through an app, portal, or questionnaire. Supporting features include a document "Vault" for storing W-2s, 1099s, receipts, statements and other records with encryption in transit and at rest, a deduction tracker that logs and categorizes deductible expenses as they occur through the year and feeds them into the return, and tracking of events such as stock option exercises and required minimum distributions. The company advertises an accuracy guarantee under which it reimburses IRS or state penalties and interest caused solely by its own error, capped at $10,000 per return and excluding additional taxes owed. Its terms note that AI-generated output is informational only and that only material reviewed by a Deduction tax professional constitutes advice from a licensed practitioner.

Founding story

Deduction was founded by Sai Dhanak (co-founder and CEO) and Jonathan Kieliszak (co-founder and CTO). Dhanak grew up in the United Kingdom, where filing is largely automated, and was struck by the complexity of the U.S. system; Kieliszak comes from a family of CPAs and observed burnout and limited technology adoption constraining the profession. The pair built the company around the thesis that consumer tax service, rather than accountant-facing software, was the underserved layer.

Business model

Deduction operates as a consumer tax firm delivering AI-assisted preparation, filing, and advisory services with licensed CPA oversight, sold directly to individual taxpayers on a flat annual fee.

Flat-fee subscription: the platform is free to use and clients pay to file. New clients are quoted $499 per year covering unlimited all-year CPA-reviewed advice and the annual filing, with no hourly rates or per-form charges; existing clients pay their prior-year price.

Traction

At launch the company reported completed filings for tech employees, creators and sole proprietors as part of an early deployment ahead of the 2026 tax season, and described early traction among young professionals, tech employees and sole proprietors. One Way Ventures' founding partner stated that a partner at the firm filed taxes using Deduction and that the service flagged an error in his process.

Latest developments

Following the November 2025 launch and pre-seed round, the company said it would use the capital to accelerate product development, expand engineering and operations, and improve the AI's reasoning, accuracy and integration with financial data sources while retaining human oversight. Its site markets a deduction tracker and document organizer, $499 annual pricing, and RIA and OS pages, and carries a 2026 copyright.