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ClaudSkills / General / business-ops

Form 1120 S

Category: General  ·  Sub-category: business-ops  ·  Last updated:
Use this skill when a corporation or LLC with an accepted S election must prepare its annual federal return, Form 1120-S, including Schedules B, K, L, M-1, M-2 and a Schedule K-1 for each shareholder. Triggers on phrases like "Form 1120-S", "1120S", "S corp tax return", "S corporation return", "file my S corp taxes", "Schedule K-1 for my S corp", "officer compensation line 7", "AAA Schedule M-2", "do I need Schedule L", "S corp distributions on the return", "K-2 K-3 domestic filing exception". Do NOT use for a C corporation return (use form-1120), a partnership or multi-member LLC without an S election (use form-1065), a sole proprietor or single-member LLC without an S election (use schedule-c), making or fixing the S election itself (use form-2553), the shareholder's own reporting of a K-1 on Form 1040 (use schedule-e and form-1040), payroll returns (use form-941), or an extension only (use form-7004).
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From the source SKILL.md

This skill produces an audit-grade draft of Form 1120-S: page 1 (lines 1a–28e), Schedule B, Schedule K, Schedules L, M-1 and M-2 when required, and one Schedule K-1 per shareholder, with a validation summary and a list of sources. The arithmetic is simple. The judgment concentrates in five places: officer compensation on line 7 (a fact the agent must ASK for, never choose), separating page 1 income from separately stated Schedule K items, the Schedule B question 11 test, the AAA roll-forward on Schedule M-2, and the per-share, per-day allocation onto each K-1.

What this skill does

Form 1120 S is a community-contributed Claude Code skill in the business-ops sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/form-1120-s/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Form 1120 S Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. 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-1120-s
curl -L https://claudskills.com/skills/form-1120-s/SKILL.md \
  -o ~/.claude/skills/form-1120-s/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/form-1120-s/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/form-1120-s/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\form-1120-s\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 1120 S Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/form-1120-s/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Form 1120 S skill do?
Use this skill when a corporation or LLC with an accepted S election must prepare its annual federal return, Form 1120-S, including Schedules B, K, L, M-1, M-2 and a Schedule K-1 for each shareholder. Triggers on phrases like "Form 1120-S", "1120S", "S corp tax return", "S corporation return", "file my S corp taxes", "Schedule K-1 for my S corp", "officer compensation line 7", "AAA Schedule M-2", "do I need Schedule L", "S corp distributions on the return", "K-2 K-3 domestic filing exception". Do NOT use for a C corporation return (use form-1120), a partnership or multi-member LLC without an S election (use form-1065), a sole proprietor or single-member LLC without an S election (use schedule-c), making or fixing the S election itself (use form-2553), the shareholder's own reporting of a K-1 on Form 1040 (use schedule-e and form-1040), payroll returns (use form-941), or an extension only (use form-7004).
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 1120 S skill?
Use Form 1120 S when your Claude Code task falls under the General category — specifically in the business ops 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 1120 S" or describe the task and let Claude pick). Browse related skills at /category/general/.
What is a Claude Code skill and how does the Form 1120 S 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 1120 S is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General 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 1120 S [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/form-1120-s/
BibTeX
@misc{form-1120-s-2026,
  author    = {jupid-tax},
  title     = {Form 1120 S [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/form-1120-s/}
}

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

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