1-Year Excel Budget Forecast Model

I need a flexible Excel model that lets me plan and track our budget over the next 12 months. The workbook should generate a dynamic Income Statement, Balance Sheet, and Cash Flow Statement that link together automatically, updating whenever I adjust key drivers such as sales volume, pricing, cost of goods, operating expenses, and capital spending.

Core requirements
• All three statements roll forward month-by-month for one full year and balance correctly.
• Key assumptions sit on a single input sheet with clear labels and color-coding.
• Built-in sensitivity toggles so I can test best-, base-, and worst-case scenarios without breaking formulas.
• Clean, readable formatting: consistent decimals, thousands separators, and no hidden cells or hard-coded numbers in the calculation sheets.
• The file must open flawlessly in the latest desktop versions of Excel (Office 365) without the need for macros; structured references and simple lookup functions are fine.

Acceptance criteria
1. I can plug new assumptions into the input sheet and see all three statements update instantly.
2. Each statement ties out (e.g., Net Income flows to Equity, ending cash equals beginning cash plus net change).
3. No formula errors (#REF!, #DIV/0!, etc.) when assumptions are changed.
4. Workbook passes a quick stress test with extreme inputs.

Please share a brief outline of your approach and an example of a similar model you have built so I can gauge fit and style.