Matching principle requires that the revenue of a given period is matched against the expenses for the same period. Depreciation represents the decline in the value of a fixed asset due to use, passage of time, or obsolescence.
According to AS-6 (Revised): "Depreciation is a measure of the wearing out, consumption or other loss of value of a depreciable asset arising from use, effluxion of time or obsolescence through technology and market-change."
Also known as the Fixed Installment Method. Depreciation remains constant from year to year.
Also known as the Reducing Balance Method. Depreciation is calculated as a fixed percentage of the book value at the beginning of each year.
Where $R$ = Rate of depreciation, $n$ = Expected useful life, $s$ = Scrap value, $c$ = Cost of asset.
| Basis of Difference | Straight Line Method | Written Down Value Method |
|---|---|---|
| Basis of charging | Original cost | Book value (cost less depreciation till date) |
| Annual depreciation charge | Fixed (Constant) every year | Declines year after year |
| Total charge (Depreciation + Repairs) | Unequal (increases in later years) | Almost equal every year |
| Income Tax recognition | Not recognised | Recognised |
| Transaction | Journal Entry |
|---|---|
| For purchase of asset | Asset A/c Dr. To Bank/Vendor A/c |
| For providing depreciation | Depreciation A/c Dr. To Asset A/c |
| For transferring to P&L | Profit & Loss A/c Dr. To Depreciation A/c |
| Transaction | Journal Entry |
|---|---|
| For providing depreciation | Depreciation A/c Dr. To Provision for Depreciation A/c |
| For transferring to P&L | Profit & Loss A/c Dr. To Depreciation A/c |
A Provision is an amount set aside by debiting the Profit and Loss Account to meet a known liability or loss, the amount of which cannot be determined with accuracy.
A Reserve is an appropriation of profit retained in the business to strengthen its financial position or meet future contingencies.
A Secret Reserve is a reserve that does not appear in the Balance Sheet. It is created by showing profits at a lower figure than actuals (e.g., by excessive depreciation or undervaluation of stock).