# Excel Formatting Standards

## Professional Font
- Use Arial or Times New Roman consistently

## Zero Formula Errors
- Every Excel model MUST have ZERO formula errors

## Color Coding Standards (Financial models)
- Blue text (0,0,255): Hardcoded inputs
- Black text (0,0,0): ALL formulas and calculations
- Green text (0,128,0): Links from other worksheets
- Red text (255,0,0): External links to other files
- Yellow background (255,255,0): Key assumptions

## Number Formatting Standards
- Years: text strings
- Currency: $#,##0
- Zeros: "-"
- Percentages: 0.0%
- Multiples: 0.0x
- Negatives: (123) not -123
