SLM Depreciation Calculator (Companies Act 2013)
Calculate Straight Line Method (SLM) depreciation as per Schedule II of Companies Act 2013 with Excel-compatible results
Comprehensive Guide to SLM Depreciation as per Companies Act 2013
The Straight Line Method (SLM) of depreciation is one of the most fundamental and widely used methods for calculating asset depreciation under the Companies Act 2013 (Schedule II). This method allocates an equal amount of depreciation expense each year over the useful life of the asset, making it particularly suitable for assets that provide consistent benefits over time.
Key Provisions of Companies Act 2013 for Depreciation
- Mandatory Depreciation: Section 123(2) makes it compulsory for companies to provide for depreciation before declaring dividends.
- Schedule II Prescription: The useful lives of assets are specified in Schedule II, though companies can use different lives if justified.
- Component Accounting: If an asset has significant components with different useful lives, each component should be depreciated separately.
- Residual Value: The Act caps residual value at 5% of the original cost for depreciation calculations.
SLM Depreciation Formula
The straight-line depreciation formula is:
Annual Depreciation = (Cost of Asset – Residual Value) / Useful Life
Where:
- Cost of Asset: Original purchase price including installation costs
- Residual Value: Estimated scrap value at end of useful life (max 5% as per Act)
- Useful Life: As specified in Schedule II or company’s justified estimate
When to Use SLM Depreciation
SLM is particularly appropriate for:
- Assets with predictable usage patterns (e.g., office equipment)
- Assets where repair costs increase over time (offsetting constant depreciation)
- Situations where companies want to show consistent expenses in financial statements
- Assets with no significant technological obsolescence (e.g., buildings)
Comparison: SLM vs WDV Method
| Feature | Straight Line Method (SLM) | Written Down Value (WDV) |
|---|---|---|
| Depreciation Pattern | Constant amount each year | Higher in early years, decreases over time |
| Tax Benefit | Lower in early years | Higher in early years |
| Book Value | Reduces linearly | Reduces exponentially |
| Suitability | Assets with consistent usage | Assets with higher maintenance in later years |
| Companies Act 2013 | Allowed for all asset classes | Allowed but SLM is default for many assets |
Schedule II Useful Lives for Common Assets
The Companies Act 2013 specifies the following useful lives for common asset categories:
| Asset Category | Useful Life (Years) | Residual Value Cap |
|---|---|---|
| Buildings (RCC Frame) | 60 | 5% |
| Plant & Machinery (General) | 15 | 5% |
| Furniture & Fixtures | 10 | 5% |
| Computers & Software | 3-6 | 5% |
| Vehicles | 8 | 5% |
| Intangible Assets | 10 | 0% |
Excel Implementation of SLM Depreciation
To implement SLM depreciation in Excel as per Companies Act 2013:
- Create columns for Year, Opening WDV, Depreciation, and Closing WDV
- Use the formula:
=SLN(cost, salvage, life) - For the first year, Opening WDV = Asset Cost
- For subsequent years, Opening WDV = Previous Closing WDV
- Depreciation remains constant each year
- Closing WDV = Opening WDV – Annual Depreciation
Example Excel setup:
| Year | Opening WDV | Depreciation | Closing WDV |
|------|-------------|--------------------|-------------------|
| 1 | 100,000 | =SLN(100000,5000,10) | =B2-C2 |
| 2 | =D2 | =$C$2 | =B3-C3 |
| ... | ... | ... | ... |
Tax Implications Under Income Tax Act
While Companies Act 2013 governs financial reporting, the Income Tax Act 1961 has its own depreciation rules:
- Section 32 allows depreciation on WDV basis for tax purposes
- Rates are specified in Appendix I (typically higher than Companies Act rates)
- Companies must maintain two sets of books – one for Companies Act and one for Income Tax
- Difference creates deferred tax assets/liabilities
The table below shows key differences between Companies Act and Income Tax Act depreciation:
| Parameter | Companies Act 2013 | Income Tax Act 1961 |
|---|---|---|
| Method | SLM or WDV (company’s choice) | WDV mandatory |
| Useful Life | As per Schedule II | As per Appendix I (often shorter) |
| Residual Value | Max 5% | Typically 5% but varies |
| Componentization | Required for significant components | Not required |
| Tax Benefit | No direct impact | Direct reduction in taxable income |
Common Mistakes to Avoid
- Ignoring Component Accounting: Not separating significant components with different lives
- Incorrect Residual Value: Exceeding the 5% cap specified in the Act
- Wrong Useful Life: Using tax depreciation rates instead of Schedule II lives
- Mid-year Purchases: Not pro-rating depreciation for assets purchased during the year
- Revaluation Impact: Not adjusting depreciation after asset revaluation
Case Study: Depreciation for Manufacturing Equipment
Let’s examine a practical example for a manufacturing company:
Scenario:
- Asset: CNC Machine
- Cost: ₹12,50,000
- Installation: ₹1,50,000
- Total Cost: ₹14,00,000
- Useful Life: 15 years (as per Schedule II)
- Residual Value: 5% of ₹14,00,000 = ₹70,000
Calculation:
- Depreciable Amount = ₹14,00,000 – ₹70,000 = ₹13,30,000
- Annual Depreciation = ₹13,30,000 / 15 = ₹88,667
Year 1 Journal Entry:
Depreciation A/c Dr. ₹88,667
To Accumulated Depreciation A/c ₹88,667
Advanced Considerations
For complex scenarios, consider these advanced aspects:
- Partial Year Depreciation: For assets purchased/sold during the year:
- If purchased on 1st April: Full year depreciation
- If purchased on 1st October: Half year depreciation (6 months)
- Formula: (Annual Depreciation × Months in use) / 12
- Change in Useful Life Estimate:
- If useful life changes, adjust remaining book value over remaining life
- Disclose as change in accounting estimate (not prior period adjustment)
- Impairment Considerations:
- If asset is impaired, first recognize impairment loss
- Then calculate depreciation on reduced carrying amount
Frequently Asked Questions
- Q: Can we use different depreciation methods for different asset classes?
A: Yes, Companies Act allows different methods for different asset classes, but consistency is required for similar assets. - Q: How to handle assets purchased in foreign currency?
A: Convert at exchange rate on purchase date. Subsequent depreciation uses historical rate. - Q: What about assets used for less than a year?
A: Pro-rate depreciation based on months of use (minimum 15 days counts as full month). - Q: Can we change from SLM to WDV method?
A: Generally not allowed. Any change requires proper justification and disclosure. - Q: How to treat assets that become obsolete before useful life ends?
A: Recognize impairment loss immediately and adjust remaining depreciation.