# Tax Fundamentals

> Apply foundational corporate tax concepts — taxable income, timing differences, compliance calendar, and tax risk awareness — in business decisions. Use when planning transactions, reviewing provisions, or coordinating with tax advisors on ordinary course issues.

- Skill: `itsual/tax-fundamentals` (Agent Skill)
- Install (CLI): `npx skillmds@latest add itsual/tax-fundamentals`
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- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: itsual (https://skillmd.com/u/itsual)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/itsual/tax-fundamentals

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# Tax Fundamentals

## Overview

Tax is a material cash and P&L reality. Finance leaders need enough literacy to spot issues early, plan the calendar, and partner effectively with specialists.

## When to Use

- Transaction and structuring pre-checks
- Tax provision and estimate processes
- Compliance calendar ownership
- Understanding book vs tax differences

## Core Practices

- Maintain a tax compliance calendar by jurisdiction
- Understand permanent vs temporary differences conceptually
- Involve tax early on M&A, entity changes, and cross-border moves
- Document positions that rely on judgment
- Separate tax cash from tax accounting in forecasts when material

## Principles

- Non-specialists should not freestyle aggressive positions
- Deadlines missed are expensive
- Substance and documentation matter
- Tax follows the business — structure after strategy, not before blindly

## Verification

- [ ] Compliance obligations and dates are tracked
- [ ] Material transactions get tax input before close
- [ ] Book-tax differences are explainable at a high level