Depreciation Formula (General):
Depreciation = (Cost of Asset – Scrap Value) ÷ Useful Life
Where:
Cost of Asset = Purchase price + installation charges + transportation etc.
Scrap Value (Residual Value) = Expected value at end of life.
Useful Life = Estimated time period the asset will be used.
Types of Depreciation Methods:
1. Straight Line Method (SLM)
Formula:
Depreciation = (Cost – Scrap Value) ÷ Useful Life
Equal depreciation every year.
2. Written Down Value (WDV) / Diminishing Balance Method
Formula:
Depreciation = Opening Book Value × Rate of Depreciation (%)
Depreciation decreases every year.
3. Sum-of-the-Years-Digits (SYD) Method
Formula:
Depreciation = (Remaining Life ÷ Sum of Years) × (Cost – Scrap Value)
Accelerated depreciation.
4. Units of Production Method
Formula:
Depreciation per unit = (Cost – Scrap Value) ÷ Estimated Units of Output
, Based on production or usage.
5. Double Declining Balance Method (Accelerated WDV)
Formula:
Depreciation = 2 × Straight Line Rate × Book Value at Beginning of Year
MCQ 1
Which depreciation method results in higher depreciation expense in early
years and lower in later years?
A) Straight Line Method
B) Written Down Value Method
C) Units of Production Method
D) None of the above
Answer: B) Written Down Value Method
MCQ 2
A machine is purchased for ₹1,00,000. Its scrap value is ₹10,000 and useful
life is 5 years.
Under Straight Line Method, what will be the book value at the end of the 3rd
year?
A) ₹46,000
B) ₹52,000
C) ₹58,000
D) ₹40,000
Solution:
Depreciation = (1,00,000 – 10,000) ÷ 5 = ₹18,000 per year
After 3 years → 1,00,000 – (18,000 × 3) = 46,000