Tier 2 California content skill for computing California estimated tax payments under Form 540-ES for full-year California residents who are sole proprietors or single-member LLCs disregarded for federal tax. Covers the California 30/40/0/30 installment schedule (NOT equal quarterly like federal), due dates (April 15, June 15, September 15, January 15), the 100% prior-year safe harbor, underpayment penalty computation on Form 5805 / 5805-F, required annual payment rules, interaction with federal estimated tax (separate payments to separate agencies), and withholding credits from W-2 or backup withholding. Defers income tax computation to ca-540-individual-return and SMLLC franchise tax to ca-smllc-form-568. MUST be loaded alongside us-tax-workflow-base v0.1 or later. California residents only. Tax year 2025.
Install with
Claude CodeCodexCursorGitHub CopilotGemini CLI
Supported by the Atlas install prompt. Skill-specific requirements vary.
Skill stats
Skills1CategoryGeneralStars0
About this skill
Tier 2 California content skill for computing California estimated tax payments under Form 540-ES for full-year California residents who are sole proprietors or single-member LLCs disregarded for federal tax. Covers the California 30/40/0/30 installment schedule (NOT equal quarterly like federal), due dates (April 15, June 15, September 15, January 15), the 100% prior-year safe harbor, underpayment penalty computation on Form 5805 / 5805-F, required annual payment rules, interaction with federal estimated tax (separate payments to separate agencies), and withholding credits from W-2 or backup withholding. Defers income tax computation to ca-540-individual-return and SMLLC franchise tax to ca-smllc-form-568. MUST be loaded alongside us-tax-workflow-base v0.1 or later. California residents only. Tax year 2025.
Quick start
Copy the install prompt. Use the green button above this README.
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Review the setup. Your agent checks the skill’s instructions, requirements, and installation scope.
Tier 2 California content skill for computing California estimated tax payments under Form 540-ES for full-year California residents who are sole proprietors or single-member LLCs disregarded for federal tax. Covers the California 30/40/0/30 installment schedule (NOT equal quarterly like federal), due dates (April 15, June 15, September 15, January 15), the 100% prior-year safe harbor, underpayment penalty computation on Form 5805 / 5805-F, required annual payment rules, interaction with federal estimated tax (separate payments to separate agencies), and withholding credits from W-2 or backup withholding. Defers income tax computation to ca-540-individual-return and SMLLC franchise tax to ca-smllc-form-568. MUST be loaded alongside us-tax-workflow-base v0.1 or later. California residents only. Tax year 2025.
About this listing
Category
General
Reported license
AGPL-3.0
Listing language (estimated)
English
Review status
Not individually reviewed
Agent compatibility
Atlas installation supports Claude Code, Codex, and Cursor. Skill-specific dependencies and features are checked during setup.
Claude Code
Codex
Cursor
GitHub Copilot
Gemini CLI