Do I send Form 1040-V to AttachKit or the IRS?

Neither goes to us — AttachKit fills it in your browser and you download it. Mail the voucher with your check or money order (and, if you haven't already, your return) to the address in the current Form 1040-V instructions. Don't staple the payment to the voucher. This isn't tax advice.

Is it safe to put my SSN in my profile?

Your SSN stays in your browser's localStorage and never syncs to our servers — even when you're signed in (your name and address sync; your SSN never does). AttachKit fills the SSN box on-device, so it isn't sent to any third-party AI.

Can I sign it in AttachKit?

The 1040-V voucher itself isn't signed, but you can fill it via /fill/1040-v and download it in your browser, then mail it with your payment.

Tax · Form 1040-V

Fill IRS Form 1040-V online — free, in your browser

IRS Form 1040-V is the payment voucher you mail with a check or money order when you owe a balance on the “Amount you owe” line of your Form 1040, 1040-SR, or 1040-NR. AttachKit opens the official blank PDF and fills the detachable voucher right in your browser: it auto-fills your name, Social Security number, and mailing address from a saved profile using on-device heuristics, then leaves the amount you're paying for you to enter and review. Your SSN is filled on-device and never sent to any third-party AI, and your PDF never leaves your device.

Your PDF never leaves your browser — open DevTools → Network and watch: the file is never uploaded.

Who needs it: Individual taxpayers who owe a balance and are paying by check or money order rather than electronically — and the preparers who fill the voucher for them. (If you pay online or by phone, you don't need Form 1040-V at all.)

Need a blank Form 1040-V? Download from the source, then drop it in below.

Form edition: 2025. Page last reviewed 2026-06-24.

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Why fill it here

Auto-fills your name, SSN, and full mailing address from a saved profile, on-device — your SSN never syncs to our servers, even when you're signed in.
Runs 100% in your browser: the PDF never uploads, and any optional AI assist only ever sees field labels, never your document or your SSN.
Free to fill unlimited forms (10 signed PDFs/mo on the free tier); you enter the amount you're paying and make the check payable to “United States Treasury” yourself.

Fill your Form 1040-V now

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Form 1040-V 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.

Do I send Form 1040-V to AttachKit or the IRS?: Neither goes to us — AttachKit fills it in your browser and you download it. Mail the voucher with your check or money order (and, if you haven't already, your return) to the address in the current Form 1040-V instructions. Don't staple the payment to the voucher. This isn't tax advice.
Is it safe to put my SSN in my profile?: Your SSN stays in your browser's localStorage and never syncs to our servers — even when you're signed in (your name and address sync; your SSN never does). AttachKit fills the SSN box on-device, so it isn't sent to any third-party AI.
Can I sign it in AttachKit?: The 1040-V voucher itself isn't signed, but you can fill it via /fill/1040-v and download it in your browser, then mail it with your payment.

More forms: Form 941 · Form 1040 · Form 2553 · Form 2848 · Form 4868 · Browse all 65 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.