What is on a W-9, line by line
Form W-9 is short, which is exactly why errors on it slip through. Most onboarding problems come from three places: the wrong name in the vendor master, a misread checkbox, and a taxpayer identification number (TIN) that ends up somewhere it should not. Here is what each part of the March 2024 revision holds and whether it is worth capturing.
- Part of the formLine 1
- What it holdsName as shown on the income tax return. Required.
- Capture it?Yes. This is the legal name for 1099 reporting.
- Part of the formLine 2
- What it holdsBusiness name or disregarded entity name, if different.
- Capture it?Yes. Often the name on invoices (a DBA).
- Part of the formLine 3a
- What it holdsFederal tax classification: one checkbox, plus a letter (C, S or P) when the LLC box is checked.
- Capture it?Yes, as one value.
- Part of the formLine 3b
- What it holdsCheckbox for partnerships, trusts and estates with foreign partners, owners or beneficiaries.
- Capture it?Yes, as yes or no.
- Part of the formLine 4
- What it holdsExemption codes: exempt payee code and FATCA exemption code.
- Capture it?Yes, if present.
- Part of the formLines 5 and 6
- What it holdsAddress, then city, state and ZIP.
- Capture it?Yes. Compare with the remit-to address.
- Part of the formLine 7
- What it holdsAccount numbers (optional). Often your vendor number.
- Capture it?Yes, if you ask vendors to fill it.
- Part of the formRequester box
- What it holdsYour company name and address (optional).
- Capture it?Rarely.
- Part of the formPart I
- What it holdsTIN: Social Security number or employer identification number.
- Capture it?Only if you need it in structured form. See below.
- Part of the formPart II
- What it holdsSignature and date.
- Capture it?Yes: signed (yes or no) and the date.
- Part of the formTop corner
- What it holdsForm revision date, for example March 2024.
- Capture it?Yes. Spots outdated forms.
| Part of the form | What it holds | Capture it? |
|---|---|---|
| Line 1 | Name as shown on the income tax return. Required. | Yes. This is the legal name for 1099 reporting. |
| Line 2 | Business name or disregarded entity name, if different. | Yes. Often the name on invoices (a DBA). |
| Line 3a | Federal tax classification: one checkbox, plus a letter (C, S or P) when the LLC box is checked. | Yes, as one value. |
| Line 3b | Checkbox for partnerships, trusts and estates with foreign partners, owners or beneficiaries. | Yes, as yes or no. |
| Line 4 | Exemption codes: exempt payee code and FATCA exemption code. | Yes, if present. |
| Lines 5 and 6 | Address, then city, state and ZIP. | Yes. Compare with the remit-to address. |
| Line 7 | Account numbers (optional). Often your vendor number. | Yes, if you ask vendors to fill it. |
| Requester box | Your company name and address (optional). | Rarely. |
| Part I | TIN: Social Security number or employer identification number. | Only if you need it in structured form. See below. |
| Part II | Signature and date. | Yes: signed (yes or no) and the date. |
| Top corner | Form revision date, for example March 2024. | Yes. Spots outdated forms. |
A worked example
This is a fictional W-9 from the accounts payable sample documents that come with CapturePoint 6, shown the way it should land in your vendor record. The TIN is masked here on purpose.
- FieldLegal name (line 1)
- Captured valueMaple Harbor Supply LLC
- FieldBusiness name (line 2)
- Captured valueMaple Harbor Supply
- FieldTax classification (line 3a)
- Captured valueLLC, taxed as S corporation (code S)
- FieldAddress (lines 5 and 6)
- Captured value80 Bayfield Avenue, Fairhaven, OH 44000
- FieldAccount number (line 7)
- Captured valueVEND-1000
- FieldTIN type and last four
- Captured valueEIN, ending 1001
- FieldSigned by, date
- Captured valueAvery Stone, 02/03/2026
- FieldForm revision
- Captured valueMarch 2024
| Field | Captured value |
|---|---|
| Legal name (line 1) | Maple Harbor Supply LLC |
| Business name (line 2) | Maple Harbor Supply |
| Tax classification (line 3a) | LLC, taxed as S corporation (code S) |
| Address (lines 5 and 6) | 80 Bayfield Avenue, Fairhaven, OH 44000 |
| Account number (line 7) | VEND-1000 |
| TIN type and last four | EIN, ending 1001 |
| Signed by, date | Avery Stone, 02/03/2026 |
| Form revision | March 2024 |
Line 1 versus line 2: the most common mistake
Vendors invoice under the name customers know, which is often the line 2 business name. The IRS matches the line 1 name against the TIN. If your vendor master holds only the trading name, a 1099 can be filed under a name that does not match the TIN, and the mismatch notice lands months later.
- Store both names: the legal name for tax reporting, the business name for search and invoice matching.
- For a sole proprietor, line 1 is the owner's own name and line 2 is the business name. Do not swap them.
- For a single-member LLC that is a disregarded entity, line 1 is the owner and line 2 is the LLC. That trips up a lot of onboarding teams.
Reading the classification checkboxes
Line 3a is a row of checkboxes: individual or sole proprietor, C corporation, S corporation, partnership, trust or estate, LLC (with a letter), and other. Capture it as one value, such as "C corporation" or "LLC, code S", not as seven separate yes or no fields. A single value is easier to validate and to map into your accounting system.
Rules that catch bad forms
- Exactly one box. No box, or two boxes, means the form goes back to the vendor or to a person.
- LLC needs a letter. If the LLC box is checked, the entry must be C, S or P. A blank or any other letter is a problem.
- "Other" needs words. If other is checked, capture the description next to it.
- Line 3b only applies to some. It should only be checked alongside partnership, trust or estate, or an LLC with code P.
- Classification and TIN agree. A corporation or partnership gives an EIN. An individual or sole proprietor may give either an SSN or an EIN.
Checking the TIN without over-trusting it
A capture tool can check the shape of a TIN. It cannot tell you the TIN is valid for that name.
- Shape: nine digits. An EIN is written 12-3456789, an SSN 123-45-6789. Store digits only and format on display.
- Which box: note whether the vendor filled the SSN boxes or the EIN boxes; it tells you which format to expect.
- Name and number together: payers who file information returns can check name and TIN combinations with the IRS TIN Matching program through IRS e-Services before the first payment. It is the step that actually prevents mismatch notices.
Keeping TINs out of names and loose exports
A TIN is a Social Security number for many sole proprietors. Treat every W-9 as sensitive, and be deliberate about where its values go after capture.
- Never put a TIN in a file or folder name. Names show up in search results, sync logs, recent-files lists, email attachments and backup reports, and anyone who can browse the folder can read them. Name W-9 files by vendor and date instead, for example
W-9 / Maple Harbor Supply LLC / 2026-02-03.pdf. - Send the full TIN to one place: the vendor master or your 1099 tool. Everywhere else, the last four digits are enough to confirm you have the right vendor.
- Know where the data file goes. Capture tools that write every captured value to a data file will write the TIN too. Put that output where only AP can read it, or do not capture the TIN as a field at all if someone keys it into the vendor master from the image anyway.
- Limit who sees the images. Store W-9s in a location with permissions and an audit trail, not a shared drive the whole office can open.
- Do not email W-9s around internally. Share a link to the stored document instead.
CapturePoint 6 helps with the first point. In its file-naming window, fields whose names mark them as a tax ID, TIN or Social Security number are shown with a shield, and choosing one for a name warns you that anyone who can open the destination will see it. You can still keep it, but nobody does it by accident. Name your TIN field "Tax ID" or "TIN" so it is recognized. Reading also happens locally on the PC, so W-9 images are not sent to a cloud service to be read.
A vendor onboarding flow that holds up
- Request the current W-9 from irs.gov, with your vendor number in line 7 if you use one.
- Receive it by mail, scan or email, and capture it with the invoices or on its own.
- Validate: legal name present, one classification, LLC letter when needed, nine-digit TIN, signed and dated, current revision.
- Match to your vendor list. An existing vendor gets an update; a new one goes to whoever approves new vendors.
- Check the name and TIN with the IRS TIN Matching program if you file 1099s.
- File the W-9 under the vendor, with access limited to AP, and keep it per your retention schedule (see our retention schedules).
For step 4, CapturePoint 6 can look captured values up in a list you import, such as a CSV export of your vendor master. The legal name is looked up in the list, a match fills the vendor number from the same row, and a name that fits more than one row equally well waits for a person rather than being guessed.
Checklist
Before a W-9 vendor goes live
- Legal name (line 1) and business name (line 2) both stored, in the right fields.
- Exactly one classification box; LLC has C, S or P; other has a description.
- TIN is nine digits and fits the classification; SSN or EIN noted.
- Name and TIN checked with IRS TIN Matching, if you file 1099s.
- Signed and dated, on the current revision.
- Address compared with the remit-to address on invoices.
- No TIN in any file name, folder name, email or shared spreadsheet.
- W-9 image stored where only AP can open it.
Where software fits
- W-9s mixed into an AP scanning stack, read on your own Windows PC: CapturePoint 6. It splits the stack, recognizes the W-9 among the invoices and other AP documents, and files each one by your naming. Help is at help.ademero.com/capturepoint.
- W-9s and invoices arriving as PDFs that should feed another system: Paige, Ademero's cloud service running on Google Cloud. Send documents in and get clean data back by download, SFTP or webhook. See help.ademero.com/paige.
- Storing W-9s with permissions, an audit trail and retention: Content Central, in the cloud or on your own servers.
The rest of the AP pile is covered in our guide to extracting data from PDFs and on the invoice processing page.