Form W-9: Who Fills It Out, and What You Do With It
Form W-9 collects a contractor’s legal name, entity type, and TIN so you can file a 1099. Who needs one, what to check, and the 24 percent trap.
There is a version of January that I do not miss. Eleven vendors paid across the year, four of them with no paperwork on file, and me writing polite emails to people who had long since stopped caring whether I could file my own tax forms.
Form W-9 is the cheapest insurance in small business administration. It is one page, it takes a vendor a few minutes, and collecting it before the first payment rather than after the last one is the difference between a routine January and a week of archaeology.
This is the employer side of it: who you collect it from, what each line actually asks, the three things worth checking on the day it arrives, and what you are required to do when somebody simply will not give you one.
I build the people and records tooling for businesses without an HR department at FirstHR, and FirstHR is an onboarding and HR platform rather than a payroll provider. This is general information, not tax advice.
What Form W-9 Is
Form W-9 is the Request for Taxpayer Identification Number and Certification. A business sends it to a payee, the payee completes and signs it, and it comes back to the business. It is a collection instrument rather than a filing, and it never travels to the IRS (Form W-9).
Two things follow from that description, and they are the most useful facts about the form. First, it is not a filing, which means there is no deadline attached to it and no penalty for having collected it late, only the practical consequences of not having it when you need it.
Second, the signature is the substance. The requester instructions count a form as valid only when it is signed and dated under penalties of perjury.
The form is also not an employment document. If the person completing it should have been on payroll, a signed W-9 does not make them a contractor, and the classification question is entirely separate from the paperwork question.
Where to Get the Printable W-9 Form
Send the current printable form from the IRS site rather than a copy sitting in your own files. The form itself is a single fillable page, followed by the payee's instructions.
A payee can complete the form on screen, then print and sign it. They can also submit it through an electronic system that meets the conditions in the requester instructions, which sit alongside the form.
Check the revision date printed under the form title before you send it out. The revision in force is dated March 2024, and an older saved copy will not carry line 3b, which asks certain partnerships, trusts, and estates about foreign partners, owners, or beneficiaries.
Who You Collect It From
Collect a W-9 from any US person you might need to file an information return for. The word "might" is deliberate: you frequently cannot know at the start of a relationship whether payments will cross a reporting threshold, and the cost of collecting one unnecessarily is nothing.
| Who | Collect a W-9? | The reason |
|---|---|---|
| Freelancers, consultants, contractors | Yes, before the first payment | The most common source of a 1099-NEC |
| A landlord you pay rent to | Yes | Rent is reportable on a 1099-MISC |
| Attorneys and law firms | Yes, even if incorporated | An explicit exception to the corporation exemption |
| Medical and health care providers | Yes, even if incorporated | Another exception to the corporation exemption |
| A vendor you believe is a corporation | Yes | The form is how you confirm the entity type rather than guessing |
| Employees | No | They complete a Form W-4; their pay is wages |
| Foreign persons and entities | No | The W-8 series or Form 8233 applies instead |
| Anyone you paid only by card or payment app | Collect it anyway | The processor reports those payments, but relationships change mid-year |
The fifth row is the one worth remembering. People routinely skip the form for a vendor whose name ends in a corporate suffix, on the reasonable assumption that corporations do not get 1099s. The assumption is usually right, but the method is fragile.
A name containing "Company" or "Co." does not let you treat a payee as an exempt corporation (IRS Publication 1281), and even a suffix such as "Inc." or "Corp." counts only when you know nothing to the contrary (26 CFR 1.6049-4). The tax classification box is the answer, and the form is how you get it.
The reporting threshold itself has changed, which is another reason to hold a form rather than a guess. Per the Instructions for Forms 1099-MISC and 1099-NEC, nonemployee compensation is reported at $2,000 or more for payments made on or after January 1, 2026, up from $600, and rent carries the same figure. A state may still apply a lower threshold of its own.
When to Ask for It
Ask for it before the first payment, without exception. Not at the threshold, not at year end, and not when you realize in December that you have a problem. The rule is simple because the leverage is simple: a vendor waiting to be paid returns a form quickly, and a vendor who has already been paid has no particular reason to.
Attaching it to the engagement paperwork rather than sending it as a separate request is what makes this stick. It arrives alongside the contract and the payment details, at the one moment when the vendor is already filling things in, and it stops being a task anybody has to remember.
What Each Line Actually Asks
The form is one page and only five areas of it matter to the business receiving it. Reading them in order takes less time than looking up what a box means later.
The name lines cause more downstream trouble than anything else on the page. The IRS matches the name and the taxpayer identification number as a pair.
A sole proprietor who writes their trading name on line 1 and their Social Security number in Part I has given you a combination that will not match anything. The legal name goes on line 1; the trading name goes on line 2.
The tax classification box is the one that changes your workload. It is the difference between owing a form in January and owing nothing, and it is the reason a W-9 from a vendor you were confident was incorporated is still worth having.
What the Exempt Payee Code Box Means
The exempt payee code is how a payee that is not subject to backup withholding says so, using a number from a list of thirteen categories in the requester instructions. It is empty on almost every form a small business receives, because those categories are mostly institutions.
| Code | The payee it applies to |
|---|---|
| 1 | An organization exempt from tax under section 501(a), any IRA, or a custodial account under section 403(b)(7) that meets the requirements of section 401(f)(2) |
| 2 | The United States or any of its agencies or instrumentalities |
| 3 | A state, the District of Columbia, a US commonwealth or territory, or any of their political subdivisions or instrumentalities |
| 4 | A foreign government or any of its political subdivisions, agencies, or instrumentalities |
| 5 | A corporation |
| 6 | A dealer in securities or commodities required to register in the United States, the District of Columbia, or a US commonwealth or territory |
| 7 | A futures commission merchant registered with the Commodity Futures Trading Commission |
| 8 | A real estate investment trust |
| 9 | An entity registered at all times during the tax year under the Investment Company Act of 1940 |
| 10 | A common trust fund operated by a bank under section 584(a) |
| 11 | A financial institution as defined under section 581 |
| 12 | A middleman known in the investment community as a nominee or custodian |
| 13 | A trust exempt from tax under section 664 or described in section 4947 |
Two of the thirteen come up in ordinary vendor work. Code 5 is the corporation, and it should agree with what the classification box has already told you rather than contradict it. Code 1 covers the nonprofits and retirement accounts you may be paying.
When the exempt payee code and the classification box contradict each other, the requester instructions say to rely on the form for the number but treat the payee as non-exempt. A blank code beside a corporate classification is different: you may accept the classification and treat the payee as exempt.
The other exemption box, the code for exemption from FATCA reporting, applies to accounts maintained outside the United States. On the forms a domestic vendor returns to you, it stays empty.
What a Completed W-9 Looks Like
Two examples cover most of what arrives: a freelancer trading as a sole proprietor, and a single-member LLC that is disregarded for tax. They complete the same form differently and both are correct.
| Where on the form | Freelancer, sole proprietor | Single-member LLC, disregarded |
|---|---|---|
| Line 1, name | Their own legal name, as it reads on their tax return | The owner’s legal name, not the name of the LLC |
| Line 2, business or trade name | The trading name they invoice under, where there is one | The LLC name, which is where it belongs |
| Line 3a, tax classification | The individual or sole proprietor box, one of the seven on that line | The box for the owner’s classification, because the entity reports through its owner |
| Line 3b, foreign partners | Empty. The question is for partnerships, trusts, and estates | Empty, on the same basis |
| Line 4, exemption codes | Empty | Empty |
| Lines 5 and 6, address | Where the information return will be mailed | Where the information return will be mailed |
| Part I, taxpayer identification number | A Social Security number, or an employer identification number where they have one and use it | The owner’s number, since Part I has to match the name on line 1 |
| Part II, signature and date | Signed by the freelancer | Signed by the owner |
The shape is the same in both columns. Line 1 carries the name the IRS matches the number against, line 2 carries the name on the invoice, and Part II is what turns the page from information into a certification.
The Three Checks Worth Thirty Seconds
Most W-9 problems are visible the moment the form arrives and invisible for the next eleven months. Three checks catch nearly all of them.
The requester instructions set out what you may accept, including the conditions under which a substitute form of your own is permitted (Instructions for the Requester of Form W-9). They are also where the backup withholding rules are stated in full.
IRS TIN Matching (TIN stands for taxpayer identification number) is the other tool worth knowing about. It lets an authorized payer check a name and number pair against IRS records before a return is filed, 25 at a time interactively or up to 100,000 in bulk.
For a handful of vendors, TIN Matching is more setup than it is worth; for dozens a year, it removes an entire category of notice.
The 24 Percent Trap
If a payee does not furnish a taxpayer identification number in the required manner, you are required to withhold 24 percent of reportable payments and deposit it with the IRS. This is an obligation on the payer, not an option, and it is the part of the W-9 process with real money attached (Internal Revenue Service).
| Trigger | What it looks like in practice | What you do |
|---|---|---|
| No taxpayer identification number furnished | The vendor ignores the request or returns the form with Part I blank | Withhold 24 percent from reportable payments and deposit it |
| The IRS says the number is wrong | A notice arrives telling you the name and number do not match | Follow the notice process, which usually means soliciting a new number from the payee |
| The payee did not certify where required | A form comes back unsigned when the rules demand a signature, such as after an incorrect-number notice | Request a signed form. For ordinary contractor payments a missing signature alone does not start withholding |
| Notified underreporting | The IRS notifies you in respect of interest or dividend payments | A narrower trigger that rarely reaches a small business |
Backup withholding is not a punishment in substance. The money is credited against the payee's own tax liability (IRS Topic 307), so it is a timing mechanism rather than a levy.
Most vendor refusals come from suspicion about why you want a Social Security number rather than from a desire to avoid tax. Explaining plainly that the withheld money counts toward their own tax bill usually resolves the standoff faster than any amount of insisting.
Foreign Payees Use a Different Form
The W-9 is for US persons. A foreign individual or entity completes the appropriate form in the W-8 series instead, or Form 8233 where a treaty exemption for personal services is being claimed. The withholding rules that follow are entirely different from backup withholding.
Which form in the series depends on who the payee is. Generally, a foreign individual uses Form W-8BEN and a foreign entity uses Form W-8BEN-E. Both establish foreign status for the beneficial owner rather than certifying a US taxpayer identification number the way a W-9 does.
This matters more than it used to, because hiring a developer or a designer in another country is now routine for businesses that have never thought about international tax.
Sending a W-9 to somebody who is not a US person and accepting it back does not make the classification correct. The withholding regime you land in is the one determined by the facts, not by the form you happened to use.
If any of your contractors are outside the United States, that is a conversation with a tax professional rather than a form to pick from a list. The domestic side of the process is straightforward; the cross-border side has genuine complexity and the penalties for getting withholding wrong are not small.
Dwight SchruteSales3 people
Darryl PhilbinWarehouse1 person
Kelly KapoorCustomer Service1 personStoring It, and for How Long
A completed W-9 usually contains a Social Security number, which makes it one of the more sensitive documents a small business collects and one of the most casually handled. Email attachments and shared drives are both bad answers, and they are also the most common ones.
Keep it for as long as it supports something: the information returns you filed, and the decision not to file where you relied on an exemption. Per the General Instructions for Certain Information Returns (2026), copies of those returns are kept at least three years from the due date, and four years where federal withholding, including backup withholding, was imposed.
Information return records therefore run on a shorter clock than the four years the IRS asks for employment tax records. A W-9 sits behind both the return you filed and the exemption you relied on when you filed nothing, so the practical answer is to keep it for the longer of the two clocks.
Access matters as much as retention. The people who need to see a taxpayer identification number are the ones preparing returns, and that is usually one or two people rather than everybody with a login. Keeping it with the vendor record is the whole of the requirement and it is the part FirstHR is built to carry alongside the rest of the people file.
Building the Habit
The businesses that never think about W-9s have made it structural rather than remembered. Five steps get you there.
None of this is complicated and all of it is boring, which is exactly why it does not happen at businesses without somebody owning the process.
One sheet carries the whole habit: who owes a form, what the three checks found on the day it arrived, where the signed copy went, and what triggered a fresh request. Keep the taxpayer identification numbers out of it and store the forms themselves somewhere with access control.
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Payee | What they do for us | Requested on | Received on | Line 1 legal name | Line 2 business or trade name | TIN type (SSN or EIN) | Name and number consistent? | Tax classification from the form | Information return expected? | Signed and dated? | Stored at | Backup withholding started on | Re-requested on, and why |
| 2 | ||||||||||||||
| 3 | ||||||||||||||
| 4 | ||||||||||||||
| 5 | ||||||||||||||
| 6 | ||||||||||||||
| 7 | ||||||||||||||
| 8 | ||||||||||||||
| 9 | ||||||||||||||
| 10 | Note | Request goes out with the engagement paperwork, before the first payment. The requested and received columns are what tell you whether that actually happened | ||||||||||||
| 11 | Note | An individual or sole proprietor usually gives a Social Security number and most entities give an employer identification number. A name and number that do not match IRS records produce a notice about an incorrect taxpayer identification number | ||||||||||||
| 12 | Note | The classification column, not the suffix on the business name, is what decides whether you owe a form in January. Attorneys and medical providers get one even when incorporated | ||||||||||||
| 13 | Note | A form with a number but no signature is not complete. Treat the certification as missing and request a signed one |
Two columns do most of the work in January. The classification column tells you which payees get an information return at all, and the received column tells you which conversations you should have had in March.
Where Small Employers Get This Wrong
Small employers get this wrong in six recurring ways, and only one of them is about the form itself.
Asking in January is first and causes the most hours lost. Every other problem on this list is downstream of it.
Skipping the form for an apparent corporation is second. The suffix on a business name is not evidence of entity type, and the tax classification box is what actually tells you whether a return is required.
Accepting an unsigned form is third. It gives you the number and none of the certification, which is the half that mattered.
Not starting backup withholding is fourth. Where a number has not been furnished, withholding is an obligation, and a payer who skips it can end up liable for the amount themselves.
Storing it in email is fifth. A Social Security number sitting in a searchable inbox indefinitely is a data problem waiting for an incident.
Treating a signed W-9 as proof of contractor status is last, and it is the most expensive misconception of the six. The form records how somebody is paid; it says nothing about whether that treatment was correct, and misclassification analysis pays no attention to which form was collected.
Nick Anisimov, FirstHR founder
Frequently Asked Questions
What is Form W-9 used for?
Form W-9 is a request for taxpayer identification number and certification. You hand it to anyone you may have to file an information return for, which usually means contractors and vendors. They send it back with their legal name, any business name, their federal tax classification, their address, and their taxpayer identification number, and they sign it under penalties of perjury. With those details you can tell in January whether you owe the payee a Form 1099 at all, and fill one in when you do. The form itself never goes to the IRS; it stays in your files. The current revision, dated March 2024, added line 3b. That question about foreign partners, owners, or beneficiaries is answered only by a partnership, trust, or estate filling in the form for a partnership, trust, or estate in which it holds an interest.
Do I send Form W-9 to the IRS?
No. This is the most common misunderstanding about the form. Form W-9 is a request you make of a payee and it is returned to you, not to the IRS. You keep it as the supporting record behind whatever information returns you file, and behind your decision not to file one. The information on it flows onto a Form 1099 at year end, and that form does go to the IRS. Because the W-9 contains a Social Security number in many cases, it should be stored with the same care as any other sensitive personnel record. The form carries the instruction in its own header: give it to the requester, do not send it to the IRS.
Who has to fill out a W-9?
Every US person you might have to file an information return for should complete one before you pay them. That covers independent contractors, freelancers, consultants, landlords who receive rent from you, attorneys, and vendors that are not incorporated. Incorporated vendors are generally exempt from reporting, but asking them too is how you confirm the entity type. Employees are not on the list: they fill in a Form W-4 instead, because their pay is wages rather than a reportable payment. Foreign persons do not use the W-9 either; they give you a W-8 series form or Form 8233 to match their circumstances. For nonemployee pay and rent, payments made from January 1, 2026, onward become reportable only at $2,000 or more, rather than the old $600, so asking early costs nothing and settles the question later.
What happens if a contractor refuses to give me a W-9?
You start backup withholding. When a payee fails to provide a taxpayer identification number in the manner the rules require, you have to hold back 24 percent of each reportable payment and pay it over to the IRS. Applying it is not your choice, and if you skip it you can end up owing the amount that should have been withheld. The withholding runs until the problem is fixed, which usually means the payee finally supplies a correct number. The payee carries a risk of their own: the penalties section of Form W-9 warns of a $50 penalty each time the payee fails to furnish a correct taxpayer identification number, unless the failure was due to reasonable cause and not to willful neglect.
What is backup withholding on a W-9?
Backup withholding is a 24 percent deduction from reportable payments, applied when the normal certification process has broken down. Three situations can set it off: the payee gives you no taxpayer identification number, the payee leaves the number uncertified where certification is required, or the IRS notifies you that the number on file is incorrect. Interest and dividend payments carry two more triggers: notified underreporting, and a payee who has not certified that they are not subject to withholding. The money goes to the IRS and is credited against the payee’s eventual tax bill, so it shifts when tax is paid rather than adding a penalty, though it feels like one to the recipient. If you were required to withhold and did not, you may become liable for the amount you failed to collect.
How long do I keep a W-9?
Hold on to the form for as long as it backs up something: a return you filed, or a decision not to file that relied on an exemption. In practice, that runs well past the year you paid the vendor. Under the IRS general instructions for information returns, you keep copies of those returns, or the means to reconstruct the data, for at least three years from their due date, and four years when federal withholding, backup withholding included, was imposed. Employment tax records follow a separate four-year clock. Because a single W-9 can sit behind both kinds of decision, use the longest period that applies. It usually holds a Social Security number, so limit access to the people who genuinely need it and keep it out of shared drives and email threads, where it would stay searchable for years.
Does a W-9 expire?
There is no expiration date printed on it and there is no automatic requirement to refresh one every year. What matters is whether the information is still accurate. Collect a new form when the payee changes their business structure, sells the business, changes their legal or trade name, changes their taxpayer identification number, or when the IRS tells you the number you hold is incorrect. Some businesses re-request annually as a matter of routine, which is more work than the rules require but does catch changes the vendor never mentioned. Nothing in the requester instructions sets a refresh interval; the trigger is a change in the information rather than the passage of time.
Can I use my own version of Form W-9?
Yes. A substitute is permitted where its content is substantially similar to the official form, the certifications are clearly stated, and the payee signs and dates under penalties of perjury. You may build it into other business forms you already use, such as an account signature card or an engagement pack. What you may not do is require the payee, by signing, to agree to provisions unrelated to those certifications, or imply that backup withholding follows unless they agree to them. Where one signature line covers the certifications and other terms, the certification language has to be boxed, bolded, or otherwise made to stand out, and the IRS prescribes a sentence saying it does not require consent to anything else, placed immediately above that line.
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