Home Office Tax Deduction Calculator

I work from home and want to calculate my home office tax deduction.

Home office details:
- Total square footage of home: [Amount]
- Square footage of dedicated office space: [Amount]
- Do you use this space exclusively for work? [Yes/No]
- Employment type: [Self-employed/W-2 Employee]
- Annual home expenses:
  - Rent or mortgage interest: [Amount]
  - Property taxes: [Amount]
  - Utilities: [Amount]
  - Home insurance: [Amount]
  - Repairs and maintenance: [Amount]
  - Internet: [Amount]
- Days worked from home per year: [Number]

Please calculate and explain:
1. Simplified method calculation ($5/sq ft, max 300 sq ft)
2. Regular method calculation (actual expenses)
3. Which method is better for my situation
4. Qualification requirements I must meet
5. What "exclusive and regular use" means
6. Documentation I need to keep
7. How this affects home sale exclusion
8. Common mistakes to avoid