You can use an Employer Identification Number instead of a Social Security Number for business tax filings, business bank accounts, payroll, and vendor paperwork, but not for your personal tax return, personal credit applications, employment as an individual, or government benefits. Federal law requires you to use your SSN as the identifying number for personal tax purposes, and putting an EIN on a credit application to hide your personal credit history is a federal crime.1Office of the Law Revision Counsel. 26 U.S. Code 6109 – Identifying Numbers The line between the two numbers matters most for sole proprietors and independent contractors, whose personal and business identities overlap.
Where an EIN Legitimately Replaces Your SSN
For business activity, the EIN is the expected identifier. Corporations file Form 1120 and partnerships file Form 1065 using the entity’s EIN, not any individual’s SSN.2Internal Revenue Service. Instructions for Form 1120 (2025) The business’s income, deductions, and credits belong to the number the IRS assigned the business.
Beyond tax returns, an EIN is the right number for:
- Opening a business bank account. Banks typically require an EIN for a business checking or savings account, even for sole proprietorships.
- Hiring employees. Any business with employees needs an EIN for payroll tax reporting, wage withholding, and W-2 filings.3Internal Revenue Service. Employer Identification Number
- Applying for business licenses and permits, which often ask for an EIN.
- Paying vendors and contractors. When your business pays an independent contractor $600 or more in a year, you report those payments under your EIN on information returns.4Internal Revenue Service. Information Returns (Forms 1099)
Using an EIN in these settings has a real privacy benefit. Every place you list an EIN is a place your SSN doesn’t appear, which reduces how often your personal number circulates through vendor files and business paperwork.
Where Your SSN Is Still Required
No number of EINs changes what the government uses to identify you personally. An EIN will not substitute in any of the following:
- Your personal tax return. Form 1040 requires your SSN, and business profits that pass through to you from a sole proprietorship, partnership, or S corporation ultimately land under your SSN on your personal return.5Internal Revenue Service. U.S. Taxpayer Identification Number Requirement
- Personal credit applications. Lenders pull consumer credit using your SSN, and credit bureaus build your file around it. An EIN has no personal credit history attached to it.
- Working as an employee. Your employer needs your SSN for wage reporting and withholding.
- Government benefits. Social Security, Medicare, and unemployment programs track eligibility through your SSN.6Social Security Administration. Request Social Security Number for the First Time
- Applying for the EIN itself. The IRS requires the “responsible party” for the entity to provide an SSN or ITIN on the application, so you can’t obtain a business number without a personal one first.7Internal Revenue Service. Get an Employer Identification Number
Sole Proprietors and Single-Member LLCs
This is where the question actually gets interesting. If you run a one-person business with no employees, no excise tax obligations, and no retirement plan like a solo 401(k) or Keogh, the IRS doesn’t require you to have an EIN at all. You can report your business income on Schedule C using your SSN.8Internal Revenue Service. Single Member Limited Liability Companies
That flips once you cross certain lines. An EIN becomes mandatory for a sole proprietor who:
- Hires employees
- Opens a Keogh or solo 401(k) retirement plan
- Buys or inherits an existing business
- Files excise tax returns
- Files for bankruptcy
Single-member LLCs sit in a slightly different spot. The IRS treats them as “disregarded entities” for income tax, but as separate entities for employment and excise taxes. If your single-member LLC has employees, the LLC needs its own EIN for payroll, and you cannot use your personal SSN in its place.8Internal Revenue Service. Single Member Limited Liability Companies
Even when it isn’t required, getting an EIN is often worth doing. It keeps your SSN off invoices, W-9 forms, and vendor records, and the application costs nothing.
Using an EIN on a W-9
Independent contractors run into this constantly. A client hands over a W-9 before any work starts, and it asks for a taxpayer identification number. A sole proprietor can enter either an SSN or an EIN. The IRS accepts both, though it encourages sole proprietors to use their SSN.9Internal Revenue Service. Form W-9 (Rev. March 2024)
If your business is anything other than a sole proprietorship, meaning a corporation, partnership, or multi-member LLC, you use the entity’s EIN on the W-9. There’s no choice. The dual option only exists for sole proprietors and single-member LLCs classified as disregarded entities, and many contractors in that position give clients an EIN specifically to keep their SSN out of the client’s files.
Do Not Use an EIN on a Personal Credit Application
A cottage industry sells “Credit Privacy Numbers,” or CPNs, and pitches them to people with damaged credit: use this nine-digit number instead of your SSN, and lenders won’t see your history. Some of these schemes recycle EINs for the same purpose. All of it is illegal.
The Credit Repair Organizations Act prohibits advising a consumer to alter their identification to conceal accurate negative credit information from credit bureaus or creditors.10Office of the Law Revision Counsel. 15 U.S. Code 1679b – Prohibited Practices The practice has a name, file segregation, and it describes exactly what the CPN pitch asks a consumer to do.
Putting an EIN or a CPN on a credit application that asks for your SSN is a false statement to a lending institution. Knowingly making a false statement on a loan or credit application to a federally insured institution carries penalties of up to $1,000,000 in fines and 30 years in prison.11Office of the Law Revision Counsel. 18 U.S. Code 1014 – Loan and Credit Applications Generally Federal prosecutors do bring these cases, especially where the conduct ties into broader identity theft.
The lawful version of the same instinct is straightforward. Get an EIN for a real business, use it for business dealings, and let it soak up the identifier requests that don’t legally require your SSN. That’s the actual privacy benefit, without the criminal exposure.
If You Don’t Have an SSN at All
Some people asking this question aren’t trying to work around bad credit. They’re noncitizens who aren’t eligible for a Social Security Number but still have U.S. tax obligations. The IRS issues an Individual Taxpayer Identification Number for that situation.12Internal Revenue Service. Individual Taxpayer Identification Number (ITIN)
An ITIN is a nine-digit number that works only for federal tax purposes. It doesn’t authorize employment, doesn’t qualify you for Social Security benefits or the Earned Income Tax Credit, and doesn’t function as identification outside the tax system. It’s available to nonresident aliens filing U.S. returns, dependents and spouses of U.S. citizens or resident aliens, and others with a federal tax obligation who aren’t eligible for an SSN.12Internal Revenue Service. Individual Taxpayer Identification Number (ITIN)
An ITIN can also serve as the responsible party’s identification when applying for an EIN, so a noncitizen who wants to start a U.S. business has a path forward without ever holding an SSN.13Internal Revenue Service. Instructions for Form SS-4
Getting an EIN When You Need One
The fastest route is the IRS online application, which issues the number immediately once you finish. You can apply for only one EIN per responsible party per day.7Internal Revenue Service. Get an Employer Identification Number The IRS defines the responsible party as the person who ultimately owns or controls the entity and has practical authority over its funds and assets.13Internal Revenue Service. Instructions for Form SS-4
If the online application isn’t available to you, Form SS-4 can go by fax or mail. Faxed applications yield an EIN in about four business days. Mailed applications take roughly four to five weeks, so plan ahead if that’s the route you’re taking.13Internal Revenue Service. Instructions for Form SS-4
Once you have the EIN, use it in the settings above where it belongs, and keep using your SSN in the places the law reserves for it. That distinction is the whole answer.