---
title: "2025 Form 6166 Residency Certification"
slug: "2025-form-6166-residency-certification"
updated: 2026-10-22T21:27:59Z
published: 2026-10-22T21:27:59Z
canonical: "help.8x8.com/2025-form-6166-residency-certification"
---

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# 2025 Form 6166 Residency Certification

**Form**

Form 6166 is an IRS-issued letter certifying that 8x8, Inc. is a U.S. corporation and a resident of the United States for purposes of U.S. taxation. This certification is for tax year 2025.

[2025 Form 6166 - Residency Cert - 8x8.pdf](https://cdn.us.document360.io/e3a59e39-abd3-4423-964c-0a4008dc5673/Images/Documentation/2025 Form 6166 - Residency Cert - 8x8.pdf?sv=2026-02-06&spr=https&st=2026-11-03T23%3A58%3A15Z&se=2026-11-04T00%3A58%3A15Z&sr=c&sp=r&sig=uZ6otGA0e1Y9kxJMoBZa1IfATO85CyNkXpAgzwbe0ao%3D)