How to Fill Out a W9: Box by Box for Freelancers

A client sends you a W9 before the first payment, and it looks more official than it is. Learning how to fill out a W9 takes a few minutes: the form runs to eight numbered lines and two parts, and a freelancer leaves several of them blank.

One thing to clear up first, because it causes needless doubt. The IRS calls it Form W-9 with a hyphen. Almost everyone types it as W9 without one. They are the same document, and this guide uses both spellings for that reason.

This article explains what each line asks. It is not tax advice. The IRS publishes Form W-9 and its instructions at IRS.gov/FormW9.

What a W9 is for, and who asks for one

Its full name is Request for Taxpayer Identification Number and Certification, and the current version is the revision dated March 2024.

The form does one job. It gives whoever is paying you your legal name, your address and your taxpayer identification number, so that at the end of the year they can report what they paid you to the IRS on a 1099 and match it to you correctly.

You give it to the client. You do not file it with the IRS, and neither does the client. They keep it.

Use the W9 only if you are a U.S. person, which includes resident aliens. Foreign persons use a Form W-8 or Form 8233 instead, and sending the wrong one creates a problem for both sides.

Line 1: your name, exactly as the IRS has it

An entry is required here, and it has to match what the IRS holds against the taxpayer number you enter further down. A mismatch creates work later for both you and your client.

For an individual, that is your legal name. For a sole proprietor, it is still your own name rather than your business name. The same applies to a single-member LLC treated as a disregarded entity: the owner's name goes on line 1.

Legal names on official forms cause more confusion than they should, and our guide to what suffix, title and designation mean on a form covers the naming fields that stall people.

Line 2: your business name, if you have one

This is for a business name, trade name, doing-business-as name, or the name of a disregarded entity, where that differs from line 1.

If you trade under your own name, leave it blank. If you invoice as something else, put it here rather than on line 1. The pairing matters: the IRS wants the name it can match on line 1, and the name your client recognizes on line 2.

Line 3a: federal tax classification

Check one box, and only one. The options are individual or sole proprietor, C corporation, S corporation, partnership, trust or estate, and limited liability company.

For an LLC that is not a disregarded entity, check the LLC box and enter a single letter in the space: C for C corporation, S for S corporation, or P for partnership.

For a disregarded entity, do the opposite. Do not check LLC. Check the box matching the tax classification of the owner instead. A single-member LLC that has made no election is a disregarded entity by default, so the box it checks is individual or sole proprietor. This is the point the March 2024 revision was rewritten to clarify, and the IRS added a note on the form specifically to prevent it.

Which box you check is a question about classification. Which number you write in Part I is a different question with its own rules, and we answer that one separately rather than here.

Line 3b: who actually needs to check this box

Line 3b was added in the March 2024 revision, and it is narrow.

Check it only when all three of the following are true. You checked partnership or trust or estate on line 3a, or checked LLC and entered P. You are giving this form to a partnership, trust or estate in which you hold an ownership interest. And you have foreign partners, owners or beneficiaries, whether directly or indirectly.

It exists so a flow-through entity receiving the form knows it may have indirect foreign partners to account for, which can require it to complete Schedules K-2 and K-3. If you are a freelancer working through a sole proprietorship or a single-member LLC, none of it applies and the box stays empty.

Lines 4 through 7: exemptions, address, and account numbers

Line 4 holds two codes: an exempt payee code and a FATCA exemption code. These exist for entities such as certain corporations, tax-exempt organizations and government bodies. An individual freelancer leaves both blank.

Lines 5 and 6 are the street address, city, state and ZIP code where the payer should send information returns. Use the address where you want your 1099 to arrive, and update it with clients when you move, because a 1099 sent to an old address still gets filed with the IRS.

Line 7 is for account numbers, and it is optional. It matters when a payer holds several accounts in your name and needs to tie the form to one of them.

Part I: your taxpayer identification number

Enter the number in the box that fits it, and make sure it matches the name on line 1. That match is the entire mechanism the form exists to create.

Which number belongs here depends on how you are set up, and the rules covering sole proprietors, single-member LLCs and disregarded entities are more involved than one line of a checklist. We cover that question on its own rather than compressing it here.

Part II: signing it

The certification is made under penalties of perjury, and an unsigned W-9 is not usable.

Signing confirms that the number you gave is correct, that you are a U.S. person, and that you are not subject to backup withholding. The instructions on the form set out the one circumstance in which part of that certification has to be struck through before signing, so read the certification rather than signing past it.

Date it. A missing date is enough on its own for a client to send the form back.

Backup withholding, and the threshold that changed for 2026

Your client can apply backup withholding at 24 percent, deducting that share of every payment and remitting it to the IRS on your behalf. You are not losing the money, but you wait until you file to see it, and the client has no discretion about it once the rule applies.

Backup withholding is triggered by the missing or incorrect number, not by any particular amount, so treat it as a consequence of not returning the W9 rather than as something that switches on at a threshold.

A separate change did happen for 2026, and it affects when your client has to report you at all. For nonemployee compensation, the Form 1099-NEC reporting threshold rose from 600 dollars, where it had sat since 1954, to 2,000 dollars for payments made after December 31, 2025.

Clients paying you less than that across the year may have no obligation to issue Form 1099-NEC for that nonemployee compensation, and many will still ask for a W-9 up front because they cannot know in advance where the total will land. Other payment categories reported on Form 1099-MISC keep their own thresholds, so this is not one number across everything. Some states set their own, lower, ones. Ask your client how they are applying it rather than assuming.

None of that changes what you owe. The threshold governs your client's reporting duty, not your tax. Income is reportable whether or not a 1099 arrives.

What this guide does not decide for you

It covers completing the form. It does not cover choosing between a Social Security number and an employer identification number, which is a separate question we answer separately. It does not cover forming an entity or electing a tax classification, both of which are decisions with consequences well beyond this form. And it does not cover what to do with the 1099 when it turns up.

If the difficulty is working out which box is which while looking at the form, Guidy reads what is on your screen and explains each field as you reach it. The AI form filler page shows how.

Key takeaways

• A W9 goes to your client and not to the IRS, and its only job is to match your name to your taxpayer number
• Line 1 takes your legal name even when you trade under a business name, which goes on line 2 instead
• A single-member LLC that is a disregarded entity checks individual or sole proprietor on line 3a rather than the LLC box
• Line 3b applies to flow-through entities with foreign partners, owners or beneficiaries, and stays blank for most freelancers
• Failing to return a W9 can trigger backup withholding at 24 percent on payments to you

FAQs

Is a W9 the same as a W-4?

No. A W-4 is for employees and sets how much tax an employer withholds from wages. A W9 is for contractors and withholds nothing by default. Being asked for a W-9 signals that the payer is treating you as self-employed.

Is it safe to email a W9?

The form carries your full name, address and taxpayer number, which is enough for identity theft. Prefer a client portal or an encrypted transfer, and if email is the only option, ask for a secure link instead of a plain attachment.

Do I need to send a new W9 to each client?

Yes. Each payer keeps its own copy, because each files its own information returns. You also send an updated one whenever your name, address, classification or taxpayer number changes.

My client says I earned too little for a 1099. Do I still owe tax?

Yes. The threshold decides whether your client has to file a form, not whether the income is taxable. Self-employment income is reportable in full regardless, and your own records are what you file from.

My saved copy is an older version of the form. Does that matter?

It can. The March 2024 revision changed line 3a and added line 3b, so an older copy is missing a line a payer may need. Download a current one from the IRS rather than reusing a file from a previous year.