Claude Code Skills·Claude Skills·The open SKILL.md registry for Claude
ClaudSkills / Security / security-misc

Form Ss 4

Category: Security  ·  Sub-category: security-misc  ·  Last updated:
Use this skill when a business, LLC, corporation, partnership, trust, estate, household employer, withholding agent, or a foreign-owned U.S. LLC needs an Employer Identification Number (EIN) and must prepare Form SS-4 or the answers for the IRS online EIN application. Triggers on phrases like "Form SS-4", "apply for an EIN", "get an EIN for my LLC", "EIN for a foreign-owned LLC", "EIN without an SSN", "responsible party on the EIN application", "which box on line 9a", "do I need a new EIN", "fax SS-4", "international EIN phone number". Do NOT use for: an individual ITIN (use ../form-w7/SKILL.md); a Social Security number (SSA Form SS-5); a preparer PTIN (Form W-12); making the entity classification election itself (use ../form-8832/SKILL.md); making the S corporation election (use ../form-2553/SKILL.md); filing employment tax returns after the EIN is issued (use ../form-941/SKILL.md); Form 5472 for a foreign-owned LLC (use ../form-5472/SKILL.md).
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

This skill produces a completed Form SS-4 draft (every line 1 through 18, the third party designee block, and the signature block) plus a channel decision: IRS online application, international telephone line, fax, or mail. The same draft doubles as the answer sheet for the online application, which asks the same questions.

What this skill does

Form Ss 4 is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/form-ss-4/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Form Ss 4 Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 211,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/form-ss-4
curl -L https://claudskills.com/skills/form-ss-4/SKILL.md \
  -o ~/.claude/skills/form-ss-4/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/form-ss-4/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/form-ss-4/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\form-ss-4\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

Frequently asked questions

How do I install the Form Ss 4 Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/form-ss-4/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Form Ss 4 skill do?
Use this skill when a business, LLC, corporation, partnership, trust, estate, household employer, withholding agent, or a foreign-owned U.S. LLC needs an Employer Identification Number (EIN) and must prepare Form SS-4 or the answers for the IRS online EIN application. Triggers on phrases like "Form SS-4", "apply for an EIN", "get an EIN for my LLC", "EIN for a foreign-owned LLC", "EIN without an SSN", "responsible party on the EIN application", "which box on line 9a", "do I need a new EIN", "fax SS-4", "international EIN phone number". Do NOT use for: an individual ITIN (use ../form-w7/SKILL.md); a Social Security number (SSA Form SS-5); a preparer PTIN (Form W-12); making the entity classification election itself (use ../form-8832/SKILL.md); making the S corporation election (use ../form-2553/SKILL.md); filing employment tax returns after the EIN is issued (use ../form-941/SKILL.md); Form 5472 for a foreign-owned LLC (use ../form-5472/SKILL.md).
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Form Ss 4 skill?
Use Form Ss 4 when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Form Ss 4" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Form Ss 4 skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Form Ss 4 is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
jupid-tax. (2026). Form Ss 4 [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/form-ss-4/
BibTeX
@misc{form-ss-4-2026,
  author    = {jupid-tax},
  title     = {Form Ss 4 [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/form-ss-4/}
}

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Security scan

Grade A · scanned 2026-10-25 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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