Contractor Compliance (W-9)
Learn what Form W-9 is, when businesses request it from contractors, and how it supports US tax reporting workflows.
Important disclaimer: This article is for general informational purposes only and does not constitute tax or legal advice. Tax rules change frequently including thresholds and withholding rates referenced below. Consult a qualified tax professional for guidance specific to your situation.
Form W-9 sits at the center of US contractor compliance. Get it right, and your 1099 filings go smoothly, your records hold up under scrutiny, and your contractor relationships stay professional. Get it wrong, and you inherit a 24% backup withholding obligation that is operationally painful and entirely avoidable.
This guide covers what the W-9 is, when to collect it, how to verify it, how long to keep it, and what to do when a contractor refuses to provide one. For businesses working with international contractors, there is a separate path: the W-8BEN applies instead, and a different set of rules governs those relationships.
What Is Form W-9?
Form W-9, formally titled “Request for Taxpayer Identification Number and Certification,” is an IRS form that collects identifying information from US persons who receive reportable payments. Independent contractors, freelancers, and vendors complete and sign the W-9. The business that pays them collects and retains it.
What the form captures: the contractor’s full legal name, their business or trade name if different, their federal tax classification, their address, and their Taxpayer Identification Number. That TIN is either a Social Security Number for individuals or an Employer Identification Number for business entities. The contractor also certifies, under penalty of perjury, that the information is accurate.
One point worth understanding clearly: the contractor fills out the W-9. You, the business, request it and keep it on file. You never file the W-9 with the IRS. It stays in your records and feeds into the 1099 you may need to file at year-end.
In March 2024, the IRS released a revised Form W-9. The update added a new Line 3b requiring partnerships, trusts, and estates to disclose whether they have foreign partners or owners. It also clarified how disregarded entities should complete Line 3a. Any W-9 you collect going forward should be the current version. Download it directly from IRS.gov.
Who Is Required to Collect W-9s?
US businesses that pay US contractors are required to collect W-9s. The reporting threshold that determines when a 1099-NEC filing is required has historically been $600 per calendar year, but the One Big Beautiful Bill Act (OBBBA) raised that floor to $2,000 for payments made after December 31, 2025, with the threshold indexed for inflation starting in 2027. (Verify current threshold with a tax professional, as rules continue to evolve.)
Two things to understand about that threshold change: it affects when a 1099-NEC is required. It does not change when you should collect a W-9. Best practice and the only operationally sound approach is to collect a W-9 from every contractor before any payment is made.
When to Collect the W-9
Before the first payment. Every time.
The IRS does not set a hard statutory deadline for W-9 collection, but the logic is straightforward. If a contractor does not provide a valid TIN and you have already paid them, your options are limited. You cannot retroactively apply backup withholding to payments already made. You become liable to the IRS for the uncollected withholding tax currently 24% (verify current rate) of the gross payment.
Build W-9 collection into your contractor onboarding process, not your year-end tax prep. It belongs alongside the signed contract, the payment terms, and any NDA. When the engagement starts, the W-9 is already on file.
Businesses that treat W-9 collection as a year-end scramble create two problems. First, contractors are harder to reach after a project ends. Second, the leverage you have at onboarding disappears once the work is done and the invoice is paid. Collect it at the start. The conversation is easier, and the compliance is automatic.
For businesses managing high contractor volumes, platforms that automate this process at onboarding remove the collection burden entirely. Ruul’s contractor onboarding infrastructure handles verification, documentation, and KYC checks for contractors engaged through its Agent of Record model, so the W-9 question does not fall on your internal team.
What to Verify on a Received W-9
Receiving a completed W-9 is not the same as having a valid one. Four things to check:
Name and TIN consistency. The legal name on the W-9 must match the TIN. A mismatch between the name and number creates a problem at 1099 filing. The IRS will flag it, and you may receive a CP2100 notice triggering backup withholding obligations. Catch this before filing, not after.
The IRS TIN Matching Program exists precisely for this. It is a free service that allows businesses to verify name and TIN combinations against IRS records before filing 1099s. You can submit up to 25 combinations online for immediate results or upload a bulk file for larger contractor pools. Use it. A TIN mismatch discovered through the program costs you nothing. The same mismatch discovered after filing costs you penalties and forces you into the B-notice process.
Federal tax classification. Line 3a of the W-9 identifies the contractor’s entity type: individual or sole proprietor, C corporation, S corporation, partnership, LLC, trust, or estate. This classification determines whether a 1099-NEC is required. Corporations generally receive an exemption from 1099-NEC reporting. Sole proprietors, single-member LLCs taxed as disregarded entities, and partnerships do not. The classification on the W-9 governs this determination. You read it and apply the rule.
Signature. An unsigned W-9 is not valid. The contractor must sign and date it under the penalties of perjury certification. A missing signature is a reason to send the form back before any payment goes out.
W-9 for Different Contractor Entity Types
The W-9 looks the same for every contractor, but what you do with it depends on how the contractor classifies themselves.
| Entity Type | TIN Used | 1099-NEC Required? | Notes |
|---|---|---|---|
| Individual / sole proprietor | SSN or EIN | Yes, if payments meet threshold | Most common contractor type |
| Single-member LLC (disregarded) | Owner’s SSN or EIN | Yes | List owner’s name on Line 1; LLC name on Line 2 |
| Partnership / multi-member LLC | EIN | Yes | Use the partnership’s EIN |
| C corporation | EIN | Generally no | Exception: legal services payments remain reportable |
| S corporation | EIN | Generally no | Same legal services exception applies |
One important exception applies across corporate entity types: payments to attorneys for legal services are reportable on a 1099-NEC regardless of whether the attorney operates as a corporation. Verify current exceptions with a tax professional before assuming the corporate exemption applies.
The rule is simple in practice: read Line 3a, apply the corresponding reporting treatment, and document it.
Retention Requirements
Keep W-9 records for four years after the last date the information was used for tax purposes, per IRS recordkeeping guidance (verify current requirements). For an ongoing contractor relationship, that four-year clock restarts each year the W-9 informs a 1099 filing.
The storage method, physical or electronic, is your choice. The requirement is that you can produce the record. For electronic storage, access controls matter: a W-9 contains a TIN, which is sensitive personal information.
Collect a new W-9 whenever a contractor’s information changes. Name changes, address updates, entity restructuring, and new EINs all require a fresh form. For long-running contractor relationships, it is good practice to refresh the W-9 every few years and confirm the information on file is still current. A stale W-9 is still on file, but it creates verification gaps if the contractor’s details have shifted.
What Happens If You Do Not Have a W-9
A contractor who refuses to provide a W-9, or fails to respond after you request one, triggers backup withholding. You must withhold 24% (verify current rate) from each payment and remit it to the IRS. This is not optional.
The mechanics: withhold 24% from each payment, remit the withheld amount to the IRS using the Electronic Federal Tax Payment System (EFTPS), and report all backup withholding at year-end on Form 945, Annual Return of Withheld Federal Income Tax. You still file the 1099-NEC for applicable payments, leaving the TIN field blank if none was provided.
This is operationally complex, and it damages the contractor relationship. The contractor receives 24% less than expected. You are managing a deposit and reporting obligation on top of your normal payroll and tax processes. Prevention is straightforward: collect the W-9 before the first payment. That single step makes backup withholding a non-issue.
The IRS B-notice process. Even with a W-9 on file, TIN mismatches caught by the IRS after 1099 filing result in a CP2100 or CP2100A notice. This is the B-notice. It tells you that one or more TINs on your information returns do not match IRS records. You have 15 business days from receipt to send the affected contractor a first B-notice along with a new W-9 form. If the contractor does not respond within 30 business days, you must begin backup withholding on future payments. The TIN Matching program, used before filing, is the most effective way to prevent B-notices from reaching you at all.
Common W-9 Mistakes and How to Avoid Them
| Mistake | Why It Hurts | Prevention |
|---|---|---|
| Waiting until January to request W-9s | Contractors are unresponsive; you miss filing deadlines | Build W-9 requests into the onboarding process |
| Accepting unsigned forms | Invalid for compliance; backup withholding risk | Check signature and date on every form received |
| Not verifying TIN and name combinations | IRS B-notices, penalties for incorrect TINs | Use IRS TIN Matching before filing |
| Not updating W-9 when contractor changes structure | Mismatched IRS records, wrong 1099 classification | Refresh W-9s when contractor notifies you of changes |
| Relying on paper forms with no organized filing system | Lost documents appear as noncompliance in audits | Use electronic storage with clear access controls |
Small process changes standardized onboarding templates, calendar reminders for annual reviews, and TIN validation before filing eliminate the majority of W-9 compliance issues before they reach your accounts payable team.
W-9 vs. W-8BEN: Which Form for Which Contractor
The W-9 is for US persons: US citizens, resident aliens, and US-registered entities. If a contractor is a US person, they complete the W-9.
The W-8BEN is for non-US individuals foreign contractors who are not US citizens or resident aliens. The W-8BEN-E applies to non-US entities, such as a foreign company providing services.
The contractor’s certification on the form confirms their status. A contractor who is a US citizen living abroad is still a US person and should provide a W-9, not a W-8BEN. A foreign national working in the US on a visa may be a resident alien for tax purposes and therefore also subject to the W-9. The status question is the contractor’s to answer and certify. Your obligation is to collect the appropriate form and not pay anyone without one.
One practical note: if a contractor provides the wrong form, the consequences are yours to manage. A foreign contractor who submits a W-9 instead of a W-8BEN creates a withholding problem if payments are later determined to require the 30% foreign withholding rate. When in doubt, ask for clarification before the first payment, not after.
Electronic W-9 Collection
Paper is not required. The IRS has permitted electronic W-9 collection since 1998, and the requirements are straightforward.
The electronic system must reliably authenticate the contractor’s identity. It must capture a valid electronic signature defined as any electronic process that satisfies the same authentication and verification standards as a handwritten signature. The signature must be the final entry in the submission, and it must appear under a perjury certification that uses the exact language of the paper form. The system must also allow you to produce a hard copy of the completed W-9 for the IRS on request.
Most contractor payment platforms have automated W-9 collection built in and satisfy these requirements by design. Using one of these platforms removes the manual collection step entirely. You send a link, the contractor completes the form, and it is stored in your account with a timestamp and signature record.
If you are collecting W-9s manually, ensure your process covers these requirements before accepting electronic submissions. A scanned PDF emailed back by the contractor does not automatically satisfy the IRS electronic signature requirements.
The Agent of Record Model and W-9 Obligations
When your business engages contractors through an Agent of Record, the W-9 collection obligation shifts. The AOR contracts directly with the contractor, handles onboarding documentation, and acts as the legal counterparty. Your business pays the AOR as a vendor. You collect the AOR’s vendor tax documentation, not individual W-9s from each contractor.
With Ruul’s Agent of Record model, the contractor’s W-9, KYC verification, and tax documentation sit between Ruul and the contractor. Your accounts payable team treats Ruul as a vendor. The complexity of collecting, verifying, and retaining individual contractor W-9s does not reach your internal processes.
Record-Keeping and Tax Readiness
W-9 records are one component of a broader contractor compliance file. Each contractor relationship should also include the signed engagement contract, all invoices, payment records, the filed 1099-NEC where applicable, and any correspondence related to TIN verification or backup withholding. Exportable, organized records are what protect you in an audit.
Staying organized and tax-ready throughout the year prevents the last-minute chaos that hits teams who treat tax documentation as a once-a-year problem. Ruul’s tax-ready documentation tools centralize transaction summaries and invoices in one place, exportable when filing season arrives.
The Short Version
W-9 collection before the first payment prevents three things: backup withholding at 24%, IRS B-notices triggered by TIN mismatches, and the year-end scramble of chasing contractors for tax information you needed months earlier.
The process is not complicated. It is a matter of building collection into onboarding, verifying what you receive, storing it for four years, and using the IRS TIN Matching program before you file.
For international contractors, Ruul’s AOR model removes the W-9 collection obligation entirely: the business pays Ruul as a vendor, and the contractor documentation sits between Ruul and the individual. Whether you are managing domestic contractors through your own payroll stack or scaling global payments, structuring compliance before the first payment is always easier than fixing it after. Learn more at ruul.io/business/contractor-compliance or explore how Ruul handles invoicing without a registered company.
FAQs
Do I need a new W-9 from a contractor every calendar year?
Not automatically. If the contractor’s name, address, TIN, and federal tax classification have not changed, the existing form remains valid. Best practice is to review your vendor list annually and request updated W-9s when you see signs of change or when a form is several years old, particularly for contractors you pay significant amounts. A new W-9 is required whenever the contractor changes their name, address, TIN, or business structure, such as converting from a sole proprietorship to a corporation.
What if a contractor has applied for a TIN but has not received it yet?
The contractor may indicate pending TIN status on the W-9 temporarily, but they must provide the actual TIN once issued to avoid backup withholding. Track the date of the initial submission and schedule a follow-up within roughly 60 days. Warn the contractor that backup withholding will apply if a valid TIN is not supplied promptly. Verify current IRS procedures, as time limits and handling can change.
Can I refuse to pay a contractor until I receive their W-9?
Yes, and most businesses make this policy explicit. Conditioning payment on receipt of a valid W-9 is both legally sound and operationally straightforward. Spell it out in the engagement contract or onboarding materials so contractors understand the requirement from the start. If a contractor refuses, you must assess whether to proceed with the engagement at all and if you do, be prepared to apply backup withholding per IRS rules.
How does W-9 compliance work when payments go through a platform or payment processor?
When businesses pay contractors through certain third-party settlement organizations or platforms, those platforms may handle their own tax reporting such as issuing 1099-K forms which can change whether the hiring business files a 1099-NEC directly. The platform often collects W-9 data from contractors itself, and the hiring business may only need vendor documentation for the platform. Review your specific platform’s documentation. With Ruul’s Agent of Record model, Ruul is the counterparty: your business collects Ruul’s vendor documentation, and Ruul manages W-9 or W-8 collection from individual contractors.
Is an ITIN acceptable on Form W-9 instead of an SSN?
In certain cases, yes. Individuals who are US persons but do not have a Social Security Number may use an Individual Taxpayer Identification Number on Form W-9, provided it is valid and used according to current IRS rules. Note that ITINs not used on a federal tax return for three consecutive years expire and require renewal. An expired ITIN on a W-9 can create processing problems even if the form itself appears complete. Consult the Instructions for Form W-7 and a qualified tax advisor before relying on an ITIN for this purpose.