Canonical: https://formzdocs.com/categories/taxpayer-identity Markdown: https://formzdocs.com/categories/taxpayer-identity.md [Home](/index.md) [All forms](/forms.md) Taxpayer & identity Document category # Taxpayer identity, withholding and ID application forms Choose among W-9, W-4, W-7 and SS-4 by the identification, election or application task you need to complete. **Choose by the task** W-9 supplies taxpayer information to a requester, W-4 supplies employee withholding elections, W-7 applies for an ITIN and SS-4 applies for an EIN. A prepared application does not issue an identification number. ## Choose the document by its recipient A client requesting taxpayer information generally has a different task from an employer collecting withholding elections. An IRS identification application has another submission process and supporting requirements. Confirm who asked for the document and what it is meant to accomplish before entering identifiers. ## Names and numbers need to belong together Use actual legal names and the identifier appropriate to the taxpayer or entity. Business and trade names are not always interchangeable. The editor checks supported formats; it does not verify that a number belongs to a person or entity. ## Review certification and delivery Check signatures and application attachments in the official instructions. Use a secure delivery channel for taxpayer numbers. Formz prepares the supported PDF; a requester handoff, IRS application submission and approval are separate events. ## Official sources Source links reviewed October 4, 2026. Use the instructions for your selected year and check current agency updates before submission. - [IRS: About Form W-9](https://www.irs.gov/forms-pubs/about-form-w-9) - [IRS: About Form W-4](https://www.irs.gov/forms-pubs/about-form-w-4) ## Supported documents [**W-9** Form W-9 gives a requester your taxpayer name, federal tax classification and taxpayer identification number for information reporting.](/forms/w9.md)[**Form W-4** Form W-4 tells an employer how to handle an employee’s federal income-tax withholding elections.](/forms/w4.md)[**Form W-7** Form W-7 is an application for an IRS individual taxpayer identification number, including certain renewals.](/forms/w7.md)[**Form SS-4** Form SS-4 collects the information used to request an employer identification number.](/forms/ss4.md) ## Preparation guides [Taxpayer & identity ## How to fill out Form W-9 Review the W-9 name, classification, address and TIN fields, including LLC considerations and common mistakes.](/guides/how-to-fill-out-w9.md)[Information returns ## W-9 vs. 1099: who completes each and why Compare taxpayer identification with payment reporting, and follow the records from a W-9 to a 1099-NEC.](/guides/w9-vs-1099.md)[Information returns ## W-2 vs. 1099: worker status comes first Compare wage reporting with nonemployee compensation reporting without treating a form choice as worker classification.](/guides/w2-vs-1099.md)