Title: W-9 forms for subcontractors: when and why | Cercha
Description: Learn when builders request a subcontractor W-9, how to check the tax identity, where to keep it, and why it belongs outside public profiles.
Canonical: https://cercha.pages.dev/guides/w-9-for-subcontractors/
# W-9 forms for subcontractors: when and why
Paperwork and pay
Request a W-9 after determining that your sub is an independent contractor. Keep the tax identity in your accounting files, separate from public credentials.
You have picked a sub and need to get the business into your payment system. Once you confirm the sub is an independent contractor, request Form W-9 for its tax name and taxpayer identification number (TIN). The IRS tells the payer to keep the form in its files. [IRS contractor forms](https://www.irs.gov/businesses/small-businesses-self-employed/forms-and-associated-taxes-for-independent-contractors).
Use these suggested checks to set up the vendor account. Ask your CPA to resolve tax classification, missing identification, and reporting exceptions for this sub.
## What a W-9 does
Form W-9 supplies a U.S. payee's tax identity and certifications to a requester. Its fields include name, business name, federal tax classification, address, and TIN. The form directs the payee to give it to the requester rather than send it to the IRS. [Official Form W-9](https://www.irs.gov/pub/irs-pdf/fw9.pdf).
Use it as the tax identity record for the vendor account. Request it from the person responsible for that business's tax information. Keep the invoice contact and the tax contact in separate fields if they are different people. Ask which contact should receive questions about a reporting mismatch.
A W-9 does not decide whether a worker is independent. The IRS says to determine the relationship before choosing how to treat payments. [IRS classification guidance](https://www.irs.gov/businesses/small-businesses-self-employed/independent-contractor-self-employed-or-employee). If you control an individual's work as an employer, pause the vendor setup and review the relationship. Do not use a completed W-9 as your answer to that question.
## Request the W-9 before the first payment is due
Request the form while you confirm the business signing the contract, the scope, and payment instructions. This is a suggested office process. Federal rules do not require every construction payment to wait for a new W-9.
Tell the sub who is paying, why you need the form, and whom to contact in accounting. Provide a secure way to return it. Set your internal follow-up date before the first planned payment. Track receipt without putting the TIN in a shared scheduling sheet.
Use [documents from a subcontractor](/guides/documents-from-a-subcontractor/) to separate the accounting file from field-release checks.
Keep other onboarding questions separate from the W-9 request. A W-9 supplies tax information. Your agreement, scope, insurance evidence, and project contacts need their own review. For the terms of the job, use the [subcontractor agreement guide](/guides/subcontractor-agreement/).
If the sub sends an old form, check whether the business says its information remains current. Do not assume a W-9 expires each year. Ask for corrected information when the account's tax identity or classification changes, and have accounting determine what documentation it needs. The IRS requester instructions explain how names and TINs are used for reporting. [Requester instructions](https://www.irs.gov/instructions/iw9).
## Check identity without rewriting the sub's answers
Compare the returned form with the vendor account. Flag differences for the business or CPA to explain. Do not fill in an uncertain tax election from a logo, a website, or the letters LLC.
Use this review table as an office checklist:
| Check | What to compare | What to do with a mismatch |
| --- | --- | --- |
| Tax name | The form and the accounting record | Ask the sub to confirm the correct reporting identity |
| Business name | The invoice name and the vendor account | Record the connection between trade name and tax name |
| Tax classification | The returned form and any previous version | Ask about a changed selection; do not infer it |
| Address | The statement-delivery contact | Confirm where the year-end statement should go |
| TIN | The protected tax record | Refer uncertainty to accounting without distributing the number |
| Certification | The applicable form instructions | Ask accounting whether the completed form is sufficient |
For a disregarded entity, the IRS instructions distinguish the owner's name on line 1 from the entity name on line 2. An LLC that is not disregarded identifies its applicable federal tax classification. [W-9 requester instructions](https://www.irs.gov/instructions/iw9). A difference between invoice name and tax name therefore needs explanation, not an automatic rejection.
Keep the explanation with the account. The person preparing next year's statement needs to know how the invoice name matches the tax name. Ask the sub to correct its own form when a field is wrong. Preserve the replacement and the date you received it.
## Keep it in restricted accounting files
The IRS contractor guidance says to retain the W-9 for four years for questions from the worker or IRS. [IRS retention statement](https://www.irs.gov/businesses/small-businesses-self-employed/forms-and-associated-taxes-for-independent-contractors). Have your CPA align that instruction with the retention schedule for the rest of your records.
Limit access to staff who need the information for accounting and tax work. Store paper forms in a locked location. Use a protected digital folder or your accounting system's controlled document area. Decide who can download forms and who can send them outside the company.
The FTC advises businesses to restrict access to sensitive information, protect stored records, and retain only what they need. [FTC business privacy guidance](https://www.ftc.gov/business-guidance/resources/protecting-personal-information-guide-business). Keep tax records separate from a crew roster or public credentials folder.
On your vendor checklist, you can mark “W-9 received” and the receipt date. The superintendent can then check onboarding status without opening a tax document. Avoid using an SSN as the vendor number. Give the office a separate vendor number.
Before disposal, check the retention schedule and any unresolved tax or payment issue. Arrange secure destruction through the person responsible for your records. Do not leave old forms in a truck folder or an unrestricted project archive.
## Keep tax numbers out of public credentials
A portfolio shows work. A credential record helps you review a business's authorization or coverage. A W-9 can contain a personal tax identifier. [Form W-9 fields](https://www.irs.gov/pub/irs-pdf/fw9.pdf). Keep the full form out of public profiles, Gallery photos, bid announcements, and endorsement attachments.
If a sub has bundled its W-9 into a public introduction PDF, ask for a separate private copy. Use a version of the introduction that omits tax identifiers. Check document thumbnails and photo backgrounds before you share the public version.
Set this boundary when requesting documents. Tell the sub which materials you may circulate to project staff and which stay with accounting. Do not assume that sending a document to one buyer means permission to publish it.
## Ask accounting about missing or incorrect tax information
A missing or incorrect TIN can create backup-withholding obligations. The IRS lists the applicable triggers and currently states a 24% rate. [IRS backup withholding guidance](https://www.irs.gov/businesses/small-businesses-self-employed/backup-withholding). Ask your CPA what applies before treating a missing form as an ordinary clerical delay.
Record each request and the response. Tell accounting which payments are planned and which you have already made. Do not substitute a license number, an insurance policy number, or a bank account number for a TIN.
For a non-U.S. payee, do not assume W-9 is the right form. The requester instructions distinguish W-9 use from the applicable foreign-person documentation. [IRS requester instructions](https://www.irs.gov/instructions/iw9). Refer that account to the tax professional responsible for withholding and reporting.
## Connect the form to the payment record
A completed W-9 does not mean every payment gets a 1099. Use it alongside the payment ledger and the current reporting rules. Ask your CPA which reporting form, threshold, and payment-method exceptions apply for the payment year.
Use the [invoice record](/guides/subcontractor-invoice/) to match payments to the correct payee without exposing tax numbers in public files.
Before year-end, ask accounting to check the payee name, payment methods, recorded totals, and any business changes. Keep that tax review separate from checking whether the sub has finished the work.
For year-end reporting after the payment records are reconciled, follow [the subcontractor 1099 workflow](/guides/how-to-1099-a-subcontractor/).
## Where Cercha fits
Cercha's Search and profiles help you identify a trade business and start a conversation through Messages. Use that introduction to reach the right business contact, then handle tax paperwork through your own protected accounting process. [Ask about the beta](/beta/).
Published 2026.10.14. Updated 2026.10.14.
[More guides: Paperwork and pay]()
## Related guides
- [What documents to collect from a subcontractor]()
- [How to pay a subcontractor: per job, hourly, or by draw]()
- [What is a subcontractor agreement?]()
## Build your connections
[Ask about the beta]()
## Sources
1. Internal Revenue Service. (n.d.). *Forms and associated taxes for independent contractors*. Retrieved October 14, 2026, from https://www.irs.gov/businesses/small-businesses-self-employed/forms-and-associated-taxes-for-independent-contractors
2. Internal Revenue Service. (2024, March). *Form W-9 (Rev. March 2024)*. https://www.irs.gov/pub/irs-pdf/fw9.pdf
3. Internal Revenue Service. (n.d.). *Independent contractor (self-employed) or employee?* Retrieved October 14, 2026, from https://www.irs.gov/businesses/small-businesses-self-employed/independent-contractor-self-employed-or-employee
4. Internal Revenue Service. (2024, March). *Instructions for the Requester of Form W-9 (03/2024)*. https://www.irs.gov/instructions/iw9
5. Federal Trade Commission. (n.d.). *Protecting Personal Information: A Guide for Business*. Retrieved October 14, 2026, from https://www.ftc.gov/business-guidance/resources/protecting-personal-information-guide-business
6. Internal Revenue Service. (n.d.). *Backup withholding*. Retrieved October 14, 2026, from https://www.irs.gov/businesses/small-businesses-self-employed/backup-withholding