Yes, jobs ask for Social Security numbers, and they do it because federal tax law requires employers to report your SSN on every wage statement they file with the IRS. Under 26 U.S.C. ยง 6109, any person filing a tax return or statement must include the identifying number of each individual listed, and for you that number is your Social Security number.1Office of the Law Revision Counsel. 26 USC 6109 – Identifying Numbers What varies is when in the hiring process the request is genuinely mandatory. On an initial application it usually isn’t. Once you accept an offer, it is.
Your SSN also links your paychecks to your Social Security earnings record, which is what the Social Security Administration uses later to calculate retirement, disability, and survivor benefits. Wages reported under the wrong number, or no number at all, may never be credited to you.
When You Actually Have to Provide It
On the Job Application
If an employer asks for your SSN on an initial application, providing it is almost always voluntary. Some employers want it to run a preliminary background check or verify past employment, but no federal law forces you to hand over nine digits before you have an offer. When an online form won’t let you move past the field, you can often enter zeros or contact the employer to ask about an alternative.
After You Accept an Offer
Once you accept a formal offer, the request becomes effectively mandatory. The employer needs the number to set up payroll, withhold taxes, complete your Form W-4, and file the I-9. Refusing at that point usually means the employer cannot finalize your hire, because it cannot meet its federal tax reporting obligations without it.1Office of the Law Revision Counsel. 26 USC 6109 – Identifying Numbers
If the Employer Runs a Background Check
Many employers use your SSN to order a background report through a third-party screening company. When they do, the Fair Credit Reporting Act sets the rules. Before pulling the report, the employer must give you a clear written disclosure in a standalone document explaining that it intends to obtain a background report, and you must sign a written authorization.2Federal Trade Commission. Background Checks on Prospective Employees – Keep Required Disclosures Simple
That disclosure cannot include language releasing the employer from liability, requiring you to certify everything on your application is accurate, or demanding overly broad authorizations. Any additional waivers have to sit in a separate document. If the employer decides not to hire you based on something in the report, it has to follow an “adverse action” process that includes giving you a copy of the report and a chance to dispute inaccuracies.
The I-9, and Why E-Verify Changes the Answer
Every employer has to verify the identity and work authorization of each new hire using Form I-9. That obligation comes from the Immigration Reform and Control Act of 1986.3U.S. Citizenship and Immigration Services. Handbook for Employers M-274 – 1.0 Why Employers Must Verify Employment Authorization and Identity of New Employees
On the standard I-9, providing your SSN in Section 1 is voluntary. You can leave the field blank.4U.S. Citizenship and Immigration Services. Handbook for Employers M-274 – 3.0 Completing Section 1 – Employee Information and Attestation The catch: if your employer participates in E-Verify, the SSN becomes mandatory. E-Verify is the electronic system that cross-checks I-9 information against Department of Homeland Security and Social Security Administration records, and it cannot process a case without an SSN.5E-Verify. 2.1 Form I-9 and E-Verify You’ll also need to present identity and work-authorization documents (a U.S. passport, or a combination like a driver’s license and Social Security card) within three business days of your start date.
Independent Contractor Work Uses a Different Form
If you’re hired as an independent contractor rather than an employee, the request comes on Form W-9 instead of the I-9 and W-4. The company needs your taxpayer identification number so it can report payments of $600 or more to the IRS on Form 1099-NEC. Sole proprietors are encouraged to use their SSN, though you can use an Employer Identification Number if you have one.6IRS.gov. Form W-9 – Request for Taxpayer Identification Number and Certification
Skip the W-9 and the payer must withhold 24 percent of each payment as backup withholding and send it to the IRS.7Internal Revenue Service. Topic No. 307 – Backup Withholding If you’ve applied for an SSN but haven’t received it, you can write “Applied For” in the TIN space and sign the form, though backup withholding will still apply until you provide the actual number.
What If You Don’t Have Your Social Security Card Yet
Some workers, particularly newly arrived immigrants, are authorized to work but haven’t received their card. You can start working. The employer notes on the Form I-9 that the SSN is pending and sets the form aside. Once the card arrives, you provide the number so the employer can complete the I-9 and, if applicable, create the E-Verify case.8E-Verify. My Employee Applied for a Social Security Number (SSN) but Has Not Yet Received It – What Should I Do
Replacement cards are free. After you submit a request online, in person, or by mail, the Social Security Administration typically mails the new card within 5 to 10 business days.9Social Security Administration. Replace Social Security Card
One important boundary: an Individual Taxpayer Identification Number (ITIN) is not a substitute. The IRS issues ITINs strictly for federal tax filing. An ITIN does not authorize you to work, does not qualify you for Social Security benefits, and cannot be used on a Form I-9.10Internal Revenue Service. Individual Taxpayer Identification Number (ITIN)
Protecting Your SSN During Hiring
Your SSN is one of the most valuable pieces of information an identity thief can get, so be deliberate about when and how you share it.
- If the field is optional on an initial application, skip it and provide the number after you have an offer and a legitimate employer.
- Before entering your SSN on any portal, confirm the company exists, the posting is real, and the website matches the company’s official domain.
- Don’t send your SSN by unencrypted email or text. Ask whether the employer uses a secure portal.
- After you share your number, watch your credit reports and bank statements for unfamiliar activity. Free weekly credit reports are available from each of the three major bureaus.
Employers have their own legal duty to safeguard the data. The Federal Trade Commission Act, the Fair Credit Reporting Act, and various state laws require businesses to maintain reasonable security for sensitive personal information like Social Security numbers, and most states impose breach-notification requirements as well.11Federal Trade Commission. Protecting Personal Information – A Guide for Business
Religious Objections
A small number of people hold sincere religious beliefs against using a Social Security number. The EEOC has addressed this: employers generally are not required to waive the SSN requirement, because the number is mandated by federal tax law and dropping it would typically create an undue hardship. In limited situations where an alternative identification method is feasible without undue hardship, an accommodation may be required.12U.S. Equal Employment Opportunity Commission. Section 12 – Religious Discrimination As a practical matter, most employers have no workable alternative to the SSN for payroll and tax reporting.