Fill W-9 in 10 seconds — free, no signup
A W-9 is what your clients ask you to fill out so they can 1099 you at year-end. It's literally a single page with five fields you fill out the same way every single time. AttachKit fills it once.
The work happens in your browser — open DevTools → Network and watch: the file is never uploaded to do it.
Who needs it: Freelancers, contractors, consultants, anyone who gets a 1099. Sole proprietors, single-member LLCs, S-corps, C-corps — all use the W-9.
Need a blank W-9? Download from the source, then drop it in below.
Why fill it here
- One click → name, business name, address, SSN/EIN, tax classification all populated.
- Sign and download — combine with AttachKit's sign tool to add your signature in the same flow.
- Send to your client via email without ever printing.
- Your TIN stays in your browser's localStorage and never syncs to our servers — even when you're signed in — so it's never indexed, sold, or shared.
Fill your W-9 now
W-9 questions, answered
General information, not legal or tax advice
This page is general information about a commonly-used tax form. Tax law is complex and fact-specific — for advice on your return, consult a CPA, enrolled agent, or tax attorney. AttachKit fills the PDF; the IRS holds you responsible for what's on it.
- What if I'm a single-member LLC?
- A single-member LLC that's a 'disregarded entity' puts the OWNER's name on line 1 and checks the 'Individual/sole proprietor or single-member LLC' box. For the TIN, the W-9 instructions accept either the owner's SSN or EIN; an LLC taxed as a C- or S-corp instead uses its own EIN and the matching box. This isn't tax advice — check the current W-9 instructions or a tax pro if you're unsure.
- Can I sign it in AttachKit?
- Yes — fill via /fill/w-9, then click 'Sign' in the menu to add your signature on the same PDF.
- Is it safe to put my SSN in my AttachKit profile?
- Your SSN stays in your browser's localStorage and never syncs to our servers — even when you're signed in (your name + address do sync; your SSN never does). AttachKit fills the SSN box on-device, so it isn't sent to any third-party AI at all.
More forms: Form 941 · Form 1040 · Form 2553 · Form 2848 · Form 4868 · Browse all 126 forms →
Done filling? Also sign a PDF, convert PDF to Word, Word to PDF — or see AttachKit for accountants.
AttachKit is a private, independent tool for filling and signing PDFs on your own device. It is not a government agency, law firm, or filing service, and is not affiliated with or endorsed by the IRS, USCIS, the U.S. Department of State, or any government body. Forms are provided for convenience — always download the current version and instructions from the official .gov website, and your completed document never leaves your browser.