## Estimating Working Capital Requirements
Objective: Ensure adequate current assets to meet current liabilities without keeping idle funds.
### Methods of Estimation
| Method | Basis | Best Used When |
|---|---|---|
| Current Assets Holding Period | Average holding period of each CA component; related to operating cycle | Data on operating cycle available |
| Ratio of Sales | WC as a percentage of sales (assumes CA moves with sales) | Sales forecasts are reliable |
| Ratio of Fixed Investments | WC as a percentage of fixed assets | Capital-intensive industries |
### Factors Influencing Choice of Method
- Seasonal fluctuations in demand
- Accuracy of sales forecasts
- Investment cost and variability in sales price
- Production cycle length
- Credit and collection policies of the firm
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## Permanent and Fluctuating WC — Both Are Necessary
```
Total Working Capital
├── Permanent WC (always present)
│ └── Minimum level of current assets to sustain day-to-day operations
│ Financed by: Long-term sources (equity, long-term debt)
│
└── Temporary / Fluctuating WC (varies with business cycle)
└── Additional WC needed above permanent level
Caused by: Seasonal demand, fluctuations in sales volume
Financed by: Short-term sources (bank overdraft, supplier credit)
```
Key Principle: Matching principle — permanent WC should be financed by long-term funds; temporary WC by short-term funds.
Example of Fluctuating WC: A toy manufacturer always needs ₹4 lakh for regular operations (permanent WC). During the Diwali season, inventory rises by ₹2 lakh (temporary WC = ₹2 lakh). After the season, temporary WC requirement drops back to zero.