## Special Rules in Borrowing Cost Capitalization
Certain exam scenarios deviate from the standard template and require applying specific rules from AS 16. The four most commonly tested special situations are covered here.
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### Rule 1: Expenditure on Qualifying Asset Exceeds General Borrowings
Situation: Total expenditure on qualifying assets is ₹2 crore, but total general borrowings are only ₹63 lakhs.
Rule: When expenditure exceeds borrowings, you cannot apply the cap rate to expenditure (that would imply more interest than was actually borrowed). Instead, apply the interest directly to the borrowing amount and allocate it across qualifying assets proportionally to their expenditure.
```
Allocation to each QA = Total General Interest × (Expenditure on that QA / Total Expenditure)
```
Assets that are not qualifying assets (e.g., furniture, finished goods inventory) receive none of the capitalized interest — their share goes to P&L.
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### Rule 2: Surplus Funds / No Borrowing in a Month
Situation: In a particular month, the entity has surplus cash and no outstanding loan (overdraft is nil or fully repaid).
Rule: No interest accrues in that month → ignore that month entirely for borrowing cost purposes. Do not impute notional interest.
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### Rule 3: Monthly Interest Compounding
Situation: Interest is calculated on a monthly basis (rather than annually).
Rule: Compounding applies — unpaid monthly interest is added to the outstanding principal balance and itself earns interest in subsequent months.
Tabular Approach:
| Month | Opening Balance | Expenditure | Interest (Rate × 1/12) | Closing Balance |
|---|---|---|---|---|
| Oct | 0 | 4,00,000 | 5,000 | 4,05,000 |
| Nov | 4,05,000 | 7,95,000 | 15,000 | 12,15,000 |
| Dec | 12,15,000 | 0 | 15,188 | 12,30,188 |
| ... | ... | ... | ... | ... |
Total BC Capitalized = Sum of all monthly interest amounts.
Note: If in any month expenditure is ₹X but the loan drawn is only ₹Y (Y < X), interest in that month is calculated only on ₹Y.
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### Rule 4: Temporary Investment Income (Specific Borrowings)
Situation: A company draws a specific borrowing of ₹60 lakhs but initially only uses ₹48 lakhs for construction; the remaining ₹12 lakhs is temporarily invested.
Rule: Income earned on the temporary investment must be deducted from borrowing costs before capitalizing.
```
Net BC Capitalizable = Gross Interest on Specific Loan − Investment Income from Temporary Investment
```
This prevents the entity from capitalizing interest on funds that were actually earning a return.