---
title: Why do I have to give my social security number?
description: "Learn more about the IRS W-9 form: https://www.irs.gov/pub/irs-pdf/iw9.pdf  "
---

[Skip to content](https://help.sriservices.com/knowledge/why-do-i-have-to-give-my-social-security-number#main-content)

English

Show submenu for translations

![sri_logo_text-2.png\]](https://help.sriservices.com/hs-fs/hubfs/sri_logo_text-2.png?height=40&name=sri_logo_text-2.png)

Open main navigation

Close main navigation

- English
  
  Show submenu for translations
- Go to sriservices.com

 Go to sriservices.com

 Type your question to search our knowledge base articles

- There are no suggestions because the search field is empty.

1. [Knowledge base](https://help.sriservices.com/knowledge?hsLang=en)
2. [General](https://help.sriservices.com/knowledge/general?hsLang=en)

# Why do I have to give my social security number?

Auctions requiring a W-9 will ask you to provide your tax identification or social security number. The purpose is because it is required by some states that the government office must collect in the event that the buyer earns interest on their purchase. 

Learn more about the IRS W-9 form: [https://www.irs.gov/pub/irs-pdf/iw9.pdf](https://www.irs.gov/pub/irs-pdf/iw9.pdf)

 

- [Redemption](https://help.sriservices.com/knowledge/redemption?hsLang=en)
- [Indiana Tax Sale](https://help.sriservices.com/knowledge/indiana-tax-sale?hsLang=en#main-content)
  
  
  
  
  
    - [Certification](https://help.sriservices.com/knowledge/indiana-tax-sale?hsLang=en#certification)
    - [Publication](https://help.sriservices.com/knowledge/indiana-tax-sale?hsLang=en#publication)
    - [Redemption](https://help.sriservices.com/knowledge/indiana-tax-sale?hsLang=en#redemption)
- [Indiana Commissioners' Certificate Sale](https://help.sriservices.com/knowledge/indiana-commissioners-certificate-sale?hsLang=en#main-content)
  
  
  
  
  
    - [Redemption](https://help.sriservices.com/knowledge/indiana-commissioners-certificate-sale?hsLang=en#redemption)
- [Indiana Sheriff’s Sale (Mortgage Foreclosure)](https://help.sriservices.com/knowledge/indiana-sheriffs-sale-mortgage-foreclosure?hsLang=en)
- [Iowa Tax Sale](https://help.sriservices.com/knowledge/iowa-tax-sale?hsLang=en)
- [Colorado Tax Sale](https://help.sriservices.com/knowledge/colorado-tax-sale?hsLang=en)
- [Florida Tax Sale](https://help.sriservices.com/knowledge/florida-tax-sale?hsLang=en)
- [Louisiana Tax Lien Auction](https://help.sriservices.com/knowledge/louisiana-tax-lien-auction?hsLang=en)
- [Zeus Auctions](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#main-content)
  
  
  
  
  
    - [Online](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#online)
    - [In-person](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#in-person)
    - [Payment terms](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#payment-terms)
    - [Registration for Online Auction System](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#registration-for-online-auction-system)
    - [Registration for an online auction](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#registration-for-an-online-auction)
    - [Zeus login](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#zeus-login)
    - [Bidding](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#bidding)
    - [batch](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#batch)
    - [User Accounts](https://help.sriservices.com/knowledge/zeus-auctions?hsLang=en#user-accounts)
- [Tennessee](https://help.sriservices.com/knowledge/tennessee?hsLang=en#main-content)
  
  
  
  
  
    - [General](https://help.sriservices.com/knowledge/tennessee?hsLang=en#general)
    - [Bidding](https://help.sriservices.com/knowledge/tennessee?hsLang=en#bidding)
    - [Redemption](https://help.sriservices.com/knowledge/tennessee?hsLang=en#redemption)
    - [Payment](https://help.sriservices.com/knowledge/tennessee?hsLang=en#payment)
    - [Advertisement / Listings](https://help.sriservices.com/knowledge/tennessee?hsLang=en#advertisement-listings)
    - [Registration](https://help.sriservices.com/knowledge/tennessee?hsLang=en#registration)
    - [Post Sale](https://help.sriservices.com/knowledge/tennessee?hsLang=en#post-sale)
- [Colorado Certificate Sale](https://help.sriservices.com/knowledge/colorado-certificate-sale?hsLang=en)
- [Florida Tax Certificate Auction](https://help.sriservices.com/knowledge/florida-tax-certificate-auction?hsLang=en)
- [General](https://help.sriservices.com/knowledge/general?hsLang=en)

[![Chill listening crop-3](https://help.sriservices.com/hs-fs/hubfs/Orange%20Cross.png?width=24&height=24&name=Orange%20Cross.png "Chill listening crop-3")](https://www.sriservices.com)

SRI Knowledge Base

Copyright © 2026, SRI Inc