What is the latest Form W-9 revision? The official active version is the March 2024 revision, which introduced Line 3b for specific flow-through entity declarations. The IRS also released a June 2026 draft incorporating provisions for digital asset reporting.
What are the main differences across revisions?
• Line 3b (March 2024): Adds a specific checkbox for partnerships, trusts, and estates providing a W-9 to another flow-through entity when they have foreign partners subject to Section 1446 withholding.
• Electronic Collection: Codifies guidelines under Revenue Procedure 98-44 for payers collecting W-9s through secure electronic systems.
• Digital Asset Draft (June 2026): Clarifies broker information reporting rules under recent federal legislation.
Does an existing Form W-9 expire? No. A properly executed Form W-9 generally remains valid continuously until a change in circumstances occurs (such as a legal name change, business restructure, or receipt of an IRS notice). For full details, see our guide on how long a W-9 form is valid.
Key Takeaways for 2026 Compliance
- Current Active Revision: The active official form is Rev. March 2024, which added Line 3b for specific flow-through entity reporting.
- Line 3b Clarification: Check Line 3b only when a partnership, trust, or estate provides a W-9 to another flow-through entity and has foreign partners subject to § 1446 withholding.
- Continuous Validity: A valid W-9 on file remains effective until a change in circumstances occurs (such as a legal name change or entity reclassification).
- 24% Backup Withholding: Payers must apply 24% backup withholding under IRC § 3406 if a payee fails to provide a correct name and TIN combination.
- 1099 Reporting vs W-9 Collection: While the 2026 1099-NEC reporting threshold is $2,000, best practice is to request a W-9 before making any initial payment.
What Changed in the IRS Form W-9?
Direct Answer: The most significant update in the active March 2024 revision was the addition of Line 3b, which requires flow-through entities with foreign partners to declare their status when providing a W-9 to another flow-through entity. The upcoming June 2026 draft further refines instructions for digital-asset brokers.
The IRS updates Form W-9 periodically to reflect changes in tax law and reporting procedures. While the core purpose of the form—soliciting a Taxpayer Identification Number (TIN) and certifying that you are not subject to backup withholding—remains identical, understanding the revisions ensures businesses request the right form during vendor onboarding.
For new vendor onboarding, request the current Form W-9 (Rev. March 2024) rather than relying on an older 2018 revision, particularly because the 2024 revision added Line 3b and clarified flow-through classification rules. You can generate or download the current form using our free fillable Form W-9 tool.
Important: Line 3b is not a general checkbox for every business with foreign ownership. It applies specifically when a partnership, trust, or estate provides a Form W-9 to another flow-through entity in which it holds an interest, and has foreign partners or beneficiaries subject to withholding rules under IRC § 1446.
2018 vs 2024 vs 2026 Revisions: What Are the Key Differences?
Direct Answer: The October 2018 version featured a single Line 3 checkbox area. The March 2024 revision split Line 3 into 3a and 3b for flow-through entity reporting. The June 2026 draft includes provisions aimed at digital-asset brokers and expands the official instructions from 6 to 7 pages.
Below is a side-by-side comparison of the key updates across the three recent versions of Form W-9:
| Attribute | Oct 2018 Revision | March 2024 Revision | June 2026 Draft |
|---|---|---|---|
| Line 3 Structure | Single Line 3 checkbox group | Split into Line 3a and Line 3b | Retains 3a and 3b structure with updated instructions |
| Line 3b Scope | Did not exist | Applies to flow-through entities with foreign partners | Expanded guidance for multi-tiered flow-through structures |
| FATCA Codes | Standard exemption codes 1–13 | Standard exemption codes 1–13 retained | Updated cross-references to electronic Form 8966 filing |
| Electronic Signatures | General Treasury Reg reference | Reference to electronic collection systems | Codified guidance under Rev. Proc. 98-44 / Pub. 1220 |
| Backup Withholding Rate | 24% | 24% | 24% under IRC § 3406 |
| Instructions Length | 6 pages | 6 pages | 7 pages (includes digital asset guidance) |
Which Tax Classification Box Do You Check on Line 3?
Direct Answer: Sole proprietors and single-member LLCs check "Individual/sole proprietor" (Line 1 is the owner's legal name). Multi-member LLCs check "Limited liability company" and write P (Partnership), C (C-Corp), or S (S-Corp). Check Box 3b only if a partnership or trust has foreign partners and is providing the W-9 to another flow-through entity.
Line 3 classification errors are among the most common causes of IRS TIN mismatches and vendor payment delays. Use this quick guide to choose the correct classification:
| Legal Business Structure | Box on Line 3a | Line 3b Required? | Line 1 vs Line 2 Rule |
|---|---|---|---|
| Sole Proprietorship | Individual / sole proprietor | No | Line 1 = Owner Legal Name, Line 2 = DBA Name |
| Single-Member LLC (Disregarded) | Individual / sole proprietor (or owner entity type) | No | Line 1 = Owner Legal Name, Line 2 = LLC Name |
| LLC taxed as Partnership | Limited liability company (Code: P) | Only if flow-through partner condition applies | Line 1 = Legal LLC Name, Line 2 = Blank or DBA |
| LLC taxed as S Corp | Limited liability company (Code: S) | No | Line 1 = Legal LLC Name, Line 2 = Blank |
| C Corporation / S Corporation | C Corporation or S Corporation | No | Line 1 = Corporate Legal Name |
Who Is Required to Complete and Sign Form W-9?
Direct Answer: Any U.S. citizen, resident alien, domestic corporation, partnership, or trust receiving reportable business payments, freelance compensation, real estate proceeds, or dividend/interest income must furnish a Form W-9 upon request. Nonresident aliens and foreign entities must furnish Form W-8BEN or W-8BEN-E instead.
Under federal tax law, any United States person receiving reportable income must furnish a properly completed Form W-9 upon request from a paying business. Common situations include:
Self-employed professionals and sole proprietors billing clients for non-employee services.
B2B commercial vendors providing services, medical payments, or gross legal fee disbursements.
Sellers transferring real property, providing TIN certification for Form 1099-S reporting.
Account holders opening interest-bearing or investment accounts subject to Form 1099-INT/DIV reporting.
Important: Form W-9 is for independent contractors and business entities. If you are hired as a regular W-2 employee, you must complete Form W-4 (Employee's Withholding Certificate) instead. For more guidance, read our comparison on Form W-9 vs Form W-4.
How Do You Fill Out Form W-9 Step-by-Step?
Direct Answer: To complete Form W-9 correctly: (1) Enter your exact legal tax return name on Line 1; (2) Check your federal tax classification on Line 3a; (3) Provide your current address on Lines 5–6; (4) Enter your SSN or EIN in Part I; and (5) Sign and date the Part II certification under penalties of perjury when required.
Enter Your Legal Name (Line 1 & Line 2)
Enter your exact legal name on Line 1 as shown on your federal tax return. Never place a DBA or trade name on Line 1. If you operate under a trade name or single-member LLC, write that name on Line 2.
Select Tax Classification (Line 3a & Line 3b)
Check only one primary box on Line 3a. For Limited Liability Companies (LLCs), enter the single tax designation code: C (C Corporation), S (S Corporation), or P (Partnership).
Enter Your Taxpayer Identification Number (Part I)
Sole proprietors and single-member LLCs generally enter their SSN (or owner EIN if established). Incorporated entities and multi-member partnerships enter their federal Employer Identification Number (EIN).
Sign and Date Part II Certification
Sign and date the document. By signing, you certify under penalties of perjury that your TIN is correct and you are not currently subject to backup withholding. Check that the W-9 has been properly signed and dated when a signature is required for certification.
Common Form W-9 Mistakes and How to Avoid Them
Direct Answer:Frequent errors include placing a DBA on Line 1 instead of the legal owner name, entering a single-member LLC's separate EIN instead of the owner's SSN/EIN, and checking multiple classification boxes. Using the wrong name/TIN combination can create information-reporting mismatches and may result in IRS notices (such as CP2100/CP2100A) or backup-withholding procedures.
IRS processing centers frequently flag W-9 submissions with name and TIN discrepancies that disrupt annual information return matching:
- ×Mismatched Sole Proprietorship TINs: Entering a single-member LLC business name on Line 1 rather than the owner's legal name and individual tax return TIN.
- ×Checking Multiple Classification Boxes: Checking both "Individual" and "Limited Liability Company" without providing the specific tax election letter (C, S, or P).
- ×Failing to Update Changed Information: Submitting an older form after a legal name change or entity restructuring without providing an updated W-9.
Proactive Vendor Review: Using IRS e-Services TIN Matching before year-end saves significant administrative time during 1099 filing season and helps catch mismatches early to avoid penalties under IRC § 6721.
Frequently Asked Questions
Do existing vendors need to submit a new W-9 every year?
No. Under Treasury Regulation § 31.3406(h)-3, a properly completed Form W-9 generally remains valid continuously until a change in circumstances occurs—such as a legal name change, entity tax classification change, or receipt of an IRS notice indicating an incorrect TIN.
Can businesses accept electronic signatures on Form W-9?
Yes. Under IRS Announcement 98-27 and Revenue Procedure 98-44, payers may establish electronic systems to collect W-9s. The system must verify the identity of the person signing, ensure the submission cannot be altered, record an exact timestamp, and be capable of producing hard copies for IRS examiners upon request.
What is the difference between a W-9 and a W-8BEN?
Form W-9 is strictly for U.S. citizens, resident aliens, and domestic corporate entities. Form W-8BEN (for foreign individuals) or W-8BEN-E (for foreign entities) is used by nonresident aliens performing services outside the U.S. or claiming tax treaty withholding exemptions. A U.S. payer must not accept a W-9 from a nonresident foreign person.
What happens if a contractor refuses to submit a completed W-9?
If a vendor refuses to furnish a valid TIN, the payer is required under IRC § 3406 to begin backup withholding at a flat 24% on reportable payments. The withholding agent remits these withheld funds directly to the IRS using Form 945.
Is Form W-9 submitted directly to the IRS?
No. Form W-9 is not filed directly with the IRS. It is kept in the records of the requesting payer as documentation supporting the accuracy of annual information returns (such as Forms 1099-NEC and 1099-MISC).
How long must businesses retain completed W-9 forms?
Payers should retain completed W-9 forms for at least four years following the date the last tax return referencing the payee’s payments was due or filed, pursuant to Treasury Regulation § 31.6001-1.
Does Form W-9 require a physical wet ink signature?
No. While physical ink signatures are fully valid, electronic signatures are also permitted if collected through an electronic system that meets IRS requirements under Revenue Procedure 98-44 and Treasury Regulation § 31.3406(h)-3.
What is the IRS penalty for failing to furnish a Form W-9?
Under Internal Revenue Code (IRC) § 6723, a payee who fails to provide their correct Taxpayer Identification Number to a requesting payer without reasonable cause may be subject to a $50 penalty per failure. Additionally, the payer must apply 24% backup withholding under IRC § 3406 on reportable disbursements.
- IRS.gov: Form W-9 (Rev. March 2024 / June 2026 Draft) – Request for Taxpayer Identification Number and Certification (OMB No. 1545-0029).Official Source ↗
- 26 U.S. Code § 3406: Backup withholding on reportable payments and payee TIN certification compliance (26 U.S.C. § 3406).Official Source ↗
- IRS Publication 1281: Backup Withholding for Missing and Incorrect Name/TIN(s) (Instructions for Payers) (IRS Pub. 1281).Official Source ↗
- Treasury Regulation § 31.3406(h)-3: Certificates of Taxpayer Identification Number and requirement for signed verification (Treas. Reg. § 31.3406(h)-3).Official Source ↗