Corporate Tax Form Fill — IRS PDF Automation

Fill IRS tax form PDFs programmatically using pymupdf (fitz). Companion to corporate-tax-strategic-planning (analysis → execution).

When to Use

• User has computed tax numbers and needs to fill an IRS PDF form
• User wants to regenerate a filled PDF after changing values
• User needs to discover field names in a new IRS form version

Prerequisites

• uv pip install pymupdf (provides the fitz module)
• Blank fillable PDF from IRS (e.g., f1120.pdf from irs.gov/pub/irs-pdf/)
• Source of truth YAML with all computed values

Step 1: Field Discovery