EIN vs SSN: Which to Use on Invoices and Your W-9
EIN vs SSN for freelancers and small businesses: which number goes on a W-9, invoice or 1099, when an EIN is required, and how to protect your SSN.
Quick answer: An SSN (Social Security number) identifies you as an individual. An EIN (Employer Identification Number) is a nine-digit federal tax ID for a business, issued free by the IRS. Sole proprietors without employees can use either on a W-9, but using an EIN keeps your SSN off client paperwork and reduces identity theft risk.
Freelancers run into the EIN vs SSN question the first time a client sends a W-9 form or asks for a tax ID before paying an invoice. The short version: some businesses must have an EIN, everyone else may choose one, and most self-employed people are better off with one. This guide explains which number to use on W-9s, invoices and 1099s, who must get an EIN, and how to apply. It is general information, not tax or legal advice.
What is the difference between an EIN and an SSN?
Both are nine-digit taxpayer identification numbers (TINs) that the IRS uses to match income to a taxpayer. They look different and serve different purposes:
| Feature | SSN | EIN |
|---|---|---|
| Issued by | Social Security Administration | Internal Revenue Service |
| Format | XXX-XX-XXXX | XX-XXXXXXX |
| Identifies | An individual person | A business entity, trust, estate or employer |
| Cost | Free | Free from IRS.gov |
| Used for | Personal tax returns, employment, Social Security benefits, credit | Business tax returns, payroll, business bank accounts, W-9s, 1099s |
| Risk if exposed | High: tied to personal credit and identity | Lower: business number, often semi-public |
| Can be changed | Rarely | Business can get a new one when structure changes |
The IRS describes the EIN on its page about Employer ID Numbers. Despite the name, you do not need employees to get one.
Who must have an EIN?
According to the IRS, you need an EIN if any of these apply:
- You have employees
- You operate as a corporation or partnership
- You file employment, excise, or alcohol, tobacco and firearms tax returns
- You withhold taxes on income, other than wages, paid to a nonresident alien
- You have a Keogh plan or certain other retirement plans
- Your business is a multi-member LLC, or a single-member LLC with employees or certain excise tax obligations
- You are involved with certain trusts, estates, nonprofits, farmers' cooperatives or real estate mortgage investment conduits
If none of these apply, as with most solo freelancers and single-owner LLCs without employees, an EIN is optional. Our guide on how to get an EIN walks through the free online application.
EIN vs SSN on a W-9: which number do you enter?
Form W-9 asks for your name, federal tax classification and TIN. The right entry depends on your business structure, and getting it wrong is a common reason clients receive IRS mismatch notices.
| Your setup | Line 1 (name) | TIN to enter |
|---|---|---|
| Sole proprietor, no EIN | Your personal name | Your SSN |
| Sole proprietor with an EIN | Your personal name (business name on line 2) | Your SSN or your EIN (either is allowed; the IRS encourages SSN, but many use the EIN for privacy) |
| Single-member LLC (disregarded entity) | The owner's name; LLC name on line 2 | The owner's SSN or the owner's EIN, not the LLC's EIN (the LLC's own EIN is for employment and excise taxes) |
| Multi-member LLC taxed as a partnership | The LLC's legal name | The LLC's EIN |
| LLC taxed as S or C corporation | The LLC's legal name | The LLC's EIN |
| Corporation | The corporation's legal name | The corporation's EIN |
The single-member LLC row surprises many people: the IRS instructions for Form W-9 say a disregarded entity should not enter its own EIN on the form. Check the current Form W-9 instructions before you sign, because the form was revised in recent years. For the client side of the process, see our guide to W-9s and 1099s for contractors.
Which number goes on an invoice?
US law does not require most businesses to show a federal tax ID on an invoice. Your invoice must clearly show who you are, what you provided, the amount and the payment terms. Whether to add a tax ID depends on your clients:
- Never put your SSN on an invoice. Invoices are emailed, printed, forwarded and stored by people you will never meet.
- Adding an EIN is optional. Some corporate clients ask for it during vendor onboarding, and printing it can save a back-and-forth.
- State sales tax permit numbers are sometimes required on invoices or resale paperwork, depending on the state. See our tax ID on invoice guide for country-by-country rules.
Here is an example invoice header and body for a freelance web developer who uses an EIN:
| Field | Example |
|---|---|
| From | Maya Lopez, DBA Lopez Web Studio, 214 Elm St, Austin, TX 78701 |
| EIN | 12-3456789 (illustrative) |
| Bill to | Northwind Dental Group LLC |
| Invoice number and date | INV-2026-031, October 29, 2026 |
| Website redesign, 5 pages (fixed fee) | $3,200.00 |
| Booking form integration, 6 hours at $95 | $570.00 |
| Hosting setup, first year | $180.00 |
| Total due (Net 30) | $3,950.00 |
You can build an invoice like this in a few minutes with our free invoice generator, adding your EIN in the business details field only if you want it shown.
Worked example: what happens at 1099 time
Maya, from the example above, bills Northwind $3,950 in October and $2,100 in December 2026, for $6,050 in the year. Because the total is above the Form 1099-NEC reporting threshold for payments made in 2026 (raised to $2,000 by the One Big Beautiful Bill Act, from the long-standing $600), Northwind files a 1099-NEC in early 2027 using the TIN Maya gave on her W-9.
- If Maya gave her EIN as a sole proprietor, the 1099 shows the EIN. She reports the $6,050 on Schedule C, listing the same EIN.
- If she gave her SSN, the 1099 shows her SSN and is mailed to her, and copies sit in Northwind's files.
- If she gave a number that does not match her name in IRS records, Northwind may get a CP2100 notice and have to start backup withholding at 24%.
Our guide to the 1099-NEC threshold for 2026 covers the new rule in detail, and how to file a 1099-NEC covers the payer side.
Why freelancers should consider an EIN even when it is optional
- Privacy. Every client, platform and agency that pays you over the threshold asks for a TIN. An EIN keeps your SSN in fewer databases.
- Professional image. Corporate vendor forms often expect a business tax ID.
- Banking. Many banks prefer or require an EIN for a business account, which helps keep personal and business money apart.
- Future growth. If you hire an employee later, you will need an EIN anyway.
- Cost. It is free and the online application takes minutes.
A sole proprietor's EIN does not create a separate legal entity or change your taxes. If you want liability protection, look at forming an LLC; our guides to invoicing as a sole proprietor and invoicing as an LLC show what changes on your paperwork.
How to get an EIN in five steps
- Go to the IRS EIN Assistant on IRS.gov. Only the IRS site issues EINs, and it is free.
- Choose your entity type (sole proprietor, LLC, corporation, partnership).
- Enter the responsible party's name and SSN or ITIN, plus business name, address and start date.
- Answer questions about employees and excise taxes.
- Submit and download the confirmation letter (CP 575) immediately. Save it, because banks and clients may ask for it.
The online application is available only during IRS operating hours and is limited to one EIN per responsible party per day. Applicants without an SSN or ITIN apply by fax or mail using Form SS-4.
What about ITINs and non-US freelancers?
A third type of TIN, the Individual Taxpayer Identification Number (ITIN), is for people who need to file US taxes but cannot get an SSN. Non-US freelancers working for US clients usually do not need any US number: they complete Form W-8BEN to certify foreign status instead of a W-9. See our W-8BEN guide for freelancers for details.
How to protect your SSN as a freelancer
Identity theft involving SSNs often starts with ordinary paperwork. A few habits limit your exposure:
- Use your EIN on every business form where it is allowed: W-9s, vendor applications, marketplace tax settings and business bank accounts.
- Send W-9s securely. Use the client's vendor portal, a password-protected PDF with the password sent separately, or an encrypted file-sharing link that expires.
- Verify requests. Scammers send fake W-9 requests posing as clients or the IRS. The IRS does not ask you for a W-9 by email.
- Get an IRS Identity Protection PIN. The IRS offers IP PINs to any taxpayer who can verify their identity, which blocks others from filing a return with your SSN.
- Check your credit reports and consider freezing your credit with the three bureaus if your SSN may have been exposed.
EIN vs SSN by business type: quick reference
| Business type | EIN required? | Use on W-9 | Personal return |
|---|---|---|---|
| Freelancer, sole proprietor, no employees | No (optional) | SSN or own EIN | Form 1040 with Schedule C |
| Sole proprietor with employees | Yes | SSN or EIN | Form 1040 with Schedule C |
| Single-member LLC, no employees | No (optional) | Owner's SSN or owner's EIN | Form 1040 with Schedule C |
| Multi-member LLC | Yes | LLC's EIN | Members receive Schedule K-1 |
| S corporation or C corporation | Yes | Corporation's EIN | Owners receive W-2 wages and K-1s or dividends |
If you are still choosing a structure, our LLC vs sole proprietorship guide compares the options.
Common mistakes with EINs and SSNs
- Paying a website to get an EIN. The IRS application is free.
- Putting a single-member LLC's EIN on a W-9. For a disregarded LLC, use the owner's SSN or EIN.
- Name and TIN mismatch. Line 1 must match the name the IRS has for the number.
- Emailing W-9s unencrypted. Use a secure portal or an encrypted file.
- Printing your SSN on invoices or quotes. There is no reason to, and it creates real risk.
- Applying for multiple EINs by accident. If you lose your number, find it on your CP 575 letter, old returns or bank records, or call the IRS Business and Specialty Tax Line.
One last practical tip: once you have an EIN, update it everywhere at once. Send new W-9s to active clients, update the tax settings on any marketplace or payment platform that pays you, and tell your bank. Mixing numbers across clients in the same year makes it harder to match 1099s to your Schedule C, and it can trigger mismatch notices for clients.
EIN vs SSN: the bottom line
In the EIN vs SSN choice, required cases are simple: employers, partnerships, corporations and multi-member LLCs need an EIN. For solo freelancers it is optional, but a free EIN keeps your Social Security number off W-9s and vendor forms, and it is the number to use if you ever show a tax ID on invoices. Once your details are set, our invoice generator is free, needs no sign-up, and creates a downloadable PDF in your browser, with an optional field for your business tax ID.
Frequently asked questions
Can a sole proprietor use an SSN instead of an EIN?
Yes. A sole proprietor with no employees, no Keogh or solo 401(k) plan that requires one, and no excise tax filings can use their Social Security number for business tax purposes. Many freelancers still get a free EIN anyway so they can give clients a business number on W-9 forms and invoices instead of their SSN, which reduces identity theft risk.
Does getting an EIN change how I am taxed?
No. An EIN is just an identification number. A sole proprietor or single-member LLC that gets an EIN is still taxed the same way, reporting business income on Schedule C of Form 1040 and paying self-employment tax. Your tax status changes only if you form a different entity or file an election such as Form 2553 for S corporation status or Form 8832.
How long does it take to get an EIN?
If you apply online through the IRS website and your application is validated, you receive the EIN immediately at the end of the session and can download the confirmation letter (CP 575). Applying by fax usually takes about four business days, and by mail about four weeks. The IRS does not charge a fee, so avoid websites that charge to apply for you.
Is it safe to put my SSN on a W-9?
A W-9 is a legitimate IRS form and clients need a taxpayer identification number to file Form 1099. The risk is in how it is sent and stored. Send W-9s through a secure portal or encrypted email rather than plain email, and only to clients you have verified. Using an EIN instead of your SSN limits damage if a client's records are ever breached.
Can I have both an EIN and use my SSN?
Yes. Everyone filing a personal return keeps their SSN, and a business can have an EIN at the same time. A sole proprietor with an EIN still files Form 1040 under their SSN, listing the EIN on Schedule C. Use the EIN consistently for business paperwork so your clients' 1099s and your own records match.
What happens if I give a client the wrong tax ID?
If the name and number on a W-9 do not match IRS records, the client may receive a notice from the IRS and be required to start backup withholding at 24% on your payments until you provide a correct, certified number. Make sure the name on line 1 of the W-9 matches the name the IRS has for that number, especially for LLCs and businesses with trade names.
Do I need a new EIN if my business changes?
Sometimes. A sole proprietor generally needs a new EIN when incorporating, taking on partners, or filing for bankruptcy. A business changing its name or address usually keeps its EIN and just notifies the IRS. Single-member LLCs that add members or elect corporate taxation may need a new number in certain cases. Check the IRS guidance on when a new EIN is required.
What if I am not a US citizen and have no SSN?
Foreign individuals who need a US taxpayer number for tax reporting may apply for an ITIN using Form W-7. Foreign-owned US LLCs and corporations can get an EIN, though applicants without an SSN or ITIN usually apply by fax, mail or phone rather than online. Non-US freelancers working for US clients normally provide Form W-8BEN instead of a W-9.
Should my EIN appear on my business bank account and invoices?
Banks usually require an EIN to open an account for an LLC, corporation or partnership, and many will open a sole proprietor account with either an SSN or an EIN. On invoices, a tax ID is optional in the US for most businesses. Including your EIN can save larger clients a step during vendor setup, but never print your SSN on an invoice.
Invoice Creator Editorial Team
Guides on invoicing, cash flow and small-business finance from Invoice Creator, operated by Next Software Development Company. Content is reviewed for accuracy against the fields our own invoice generator produces.
Try the invoice generator