W-9 Form 2026: Rules, Requirements, and Common Mistakes

Form W-9 is an important tax document used by businesses and other payers to collect a taxpayer identification number (TIN) and other information needed for IRS information reporting. In 2026, the IRS has a June 2026 revision of Form W-9 and updated instructions, making it important for businesses, freelancers, independent contractors, and other U.S. persons to understand how the form works.

What Is Form W-9?

Form W-9, officially called “Request for Taxpayer Identification Number and Certification,” is generally used to provide your correct TIN to a person or business that is required to file an information return with the IRS. The information may be needed to report income paid to you or certain other transactions, such as real estate transactions, mortgage interest, cancellation of debt, or other reportable payments.

Unlike a W-2, which employees receive from employers, a W-9 is generally completed by the person receiving certain payments and given to the requester. The requester then uses the information to prepare applicable information returns, such as Form 1099.

Who Needs to Complete a W-9?

Form W-9 is generally used by U.S. persons, including U.S. citizens, resident aliens, domestic businesses, partnerships, corporations, estates, and certain trusts. A business may ask a freelancer or independent contractor to complete a W-9 before making payments for services.

For example, if a company hires an independent graphic designer, consultant, accountant, writer, or other contractor, the company may request a completed W-9. The contractor provides their legal name, tax classification, TIN, and certification so the business can meet its information-reporting responsibilities.

A W-9 is also used in various other situations where a payer needs a recipient's TIN for reporting purposes.

Who Should Not Use Form W-9?

Form W-9 is generally intended for U.S. persons. Foreign individuals and foreign entities generally use the appropriate Form W-8 rather than Form W-9 to establish their foreign status for U.S. tax withholding and reporting purposes.

If you are uncertain whether you are considered a U.S. person for federal tax purposes, it is wise to review the IRS instructions or seek professional tax advice before completing the form.

How to Fill Out Form W-9

Completing a W-9 is usually straightforward, but accuracy is important because the information may be used for tax reporting.

Line 1: Name

Enter your legal name as it appears on your federal tax return. If you are an individual operating a business under a different name, the name that belongs on Line 1 can depend on your tax classification.

For a sole proprietor or single-member LLC treated as a disregarded entity, special rules apply. The IRS instructions explain that the owner's name generally goes on Line 1, while the business or disregarded entity's name may be entered on Line 2.

Line 2: Business Name

If you operate under a business or trade name that is different from the name entered on Line 1, enter the appropriate business name on Line 2.

For example, a sole proprietor may use their personal legal name on Line 1 and their business's trade name on Line 2.

Line 3a: Federal Tax Classification

Line 3a is used to identify your federal tax classification. Depending on your circumstances, you may need to identify yourself as an individual or sole proprietor, C corporation, S corporation, partnership, trust or estate, or LLC with the applicable tax classification.

LLCs should pay particular attention to this section because the correct classification depends on how the LLC is treated for federal tax purposes.

Line 3b: Foreign Partners, Owners, or Beneficiaries

The 2026 revision adds Line 3b for certain partnerships, trusts, and estates. This line is relevant when such an entity provides a W-9 to a flow-through entity in which it owns an interest and has foreign partners, owners, or beneficiaries. The IRS's June 2026 instructions provide additional guidance on when this line applies.

This is one reason businesses and entities with more complicated ownership structures should review the current instructions rather than relying on an older W-9.

Line 4: Exemptions

Line 4 may apply if you are exempt from certain reporting or backup withholding requirements. Not every individual or contractor needs to enter information here.

If you believe an exemption applies, carefully review the current IRS instructions to determine the correct exemption code.

Lines 5 and 6: Address

Enter the address where the requester should mail information returns, such as a Form 1099, if applicable. Make sure the address is accurate and current.

Part I: Taxpayer Identification Number

Part I is where you provide your TIN. For an individual, the TIN is generally a Social Security number (SSN). In certain circumstances, an individual may use an Individual Taxpayer Identification Number (ITIN). Businesses may generally use an Employer Identification Number (EIN), depending on their tax classification.

Entering the wrong TIN can cause reporting problems and may result in backup withholding.

Part II: Certification

Finally, you generally sign and date the form to certify that the information provided is correct. By signing, you are making certifications under penalties of perjury concerning the information on the form.

Make sure you understand the certifications before signing.

What Happens After You Complete a W-9?

You generally give the completed W-9 to the business or other requester that asked for it. You normally do not send the W-9 directly to the IRS simply because you completed the form.

The requester keeps the information and uses it for applicable reporting and withholding responsibilities. A completed W-9 can help a payer properly report payments made to you.

What Is Backup Withholding?

Backup withholding is a federal tax withholding requirement that can apply in certain situations. Under the IRS instructions, a payer may be required to withhold 24% of certain reportable payments when applicable conditions are met, such as a payee failing to provide a TIN or the IRS notifying the payer that a TIN is incorrect.

Providing a properly completed W-9 does not automatically eliminate every possible withholding obligation, but it can provide the payer with the information and certification needed to meet applicable requirements.

The 2026 instructions also address changes to information-reporting and backup-withholding thresholds. The IRS notes that legislation increased the threshold to $2,000 for many reportable payments under sections 6041 and 6041A for payments made after 2025, with inflation adjustments applying after 2026.

Common W-9 Mistakes to Avoid

One of the most common mistakes is entering a business name where the owner's name should appear. Another is selecting the wrong federal tax classification or entering an incorrect SSN or EIN.

Other mistakes include:

• Providing an outdated address
• Using the wrong TIN
• Forgetting to sign and date the form
• Using an inappropriate exemption code
• Giving a W-9 when a Form W-8 is required
• Continuing to use outdated information after your tax circumstances change

If your name, business structure, or TIN changes, you may need to provide an updated W-9.

Is a W-9 the Same as a W-4?

No. A W-9 and W-4 serve different purposes.

Employees generally complete Form W-4 so their employer can determine the appropriate federal income tax withholding from wages. Form W-9, on the other hand, is generally used to provide a TIN and certification to a payer that may need to report payments to the IRS.

Independent contractors commonly encounter W-9 requests, while employees generally complete W-4 forms.

Final Thoughts

Form W-9 is a relatively simple document, but providing accurate information is important because it can affect tax reporting and backup withholding. In 2026, taxpayers should pay attention to the current IRS version and instructions, particularly because the IRS has issued a June 2026 revision with updated provisions.

If a business asks you for a W-9, provide accurate information and keep a copy for your records. If you have a complicated business structure, foreign ownership, multiple entities, or uncertainty about your tax classification, consider consulting a qualified tax professional before completing the form.