The Business Need
A financial services company has a complex tax calculation model in Excel with:
- Multiple income sources
- Various deduction categories
- Different tax brackets
- State and federal calculations
The Excel Model (Named Cells)
Named Cells:
federal_income = 75000
state_income = 75000
filing_status = "Single"
itemized_deductions = 8000
Calculated Fields (formulas):
standard_deduction = IF(filing_status="Single", 12950, 25900)
actual_deduction = MAX(standard_deduction, itemized_deductions)
federal_taxable = MAX(0, federal_income - actual_deduction)
federal_tax = TaxBracketCalculation(federal_taxable)
state_tax = state_income * 0.05
total_tax = federal_tax + state_tax
effective_tax_rate = total_tax / federal_income
The API Result
GET /calculations/tax-calculator?federal_income=75000&state_income=75000&filing_status=Single&itemized_deductions=8000
Response:
{
"success": true,
"data": {
"federal_income": 75000,
"state_income": 75000,
"filing_status": "Single",
"itemized_deductions": 8000,
"standard_deduction": 12950,
"actual_deduction": 12950,
"federal_taxable_income": 62050,
"federal_tax": 9614,
"state_tax": 3750,
"total_tax": 13364,
"effective_tax_rate": 0.1782
}
}
Integration Benefits
- No Code Duplication: Tax logic stays in Excel where experts maintain it
- Real-time Updates: When tax laws change, update Excel and API automatically reflects changes
- Consistent Results: Same calculation engine across web app, mobile app, and partner integrations