How to Calculate Depreciation of Prefabricated Panel Houses

The depreciation calculation of prefabricated panel houses mainly adopts the straight-line depreciation method, the double-declining-balance method, and the sum-of-the-years'-digits method. The specific method needs to be comprehensively determined based on the original value of the house, the residual value rate, the useful life, and actual wear and tear. Here are the specific methods and precautions:

I. Common Depreciation Calculation Methods

1. Straight-Line Depreciation Method
   It assumes that the value of the house decreases uniformly over time. The formula is:
   Annual Depreciation Amount = (Original Value of Fixed Assets - Estimated Net Residual Value) ÷ Estimated Useful Life
   For example, if the original value of a panel house is 500,000 yuan, the estimated net residual value rate is 5% (i.e., a residual value of 25,000 yuan), and the useful life is 20 years, then the annual depreciation amount is (500,000 - 25,000) ÷ 20 = 23,750 yuan. According to the Implementation Regulations of the Enterprise Income Tax Law, the minimum depreciation period for houses is 20 years, and the residual value rate is usually 5%, but it can be adjusted according to actual circumstances.

2. Double-Declining-Balance Method
   It is suitable for assets with rapid depreciation in the early stages and slow depreciation in the later stages. The formula is:
   Annual Depreciation Rate = 2 ÷ Estimated Useful Life × 100%
   Annual Depreciation Amount = Book Net Value of Fixed Assets at the Beginning of the Year × Annual Depreciation Rate
   In the last two years, the book net value should be deducted from the residual value and then amortized evenly. For example, with an original value of 500,000 yuan and a useful life of 20 years, the first-year depreciation rate is 10%, and the depreciation amount is 500,000 × 10% = 50,000 yuan; the book net value in the second year is 450,000 yuan, and the depreciation amount is 450,000 × 10% = 45,000 yuan, and so on.

3. Sum-of-the-Years'-Digits Method
   The depreciation rate is calculated based on the ratio of the remaining useful life to the total number of years of the estimated useful life. The formula is:
   Annual Depreciation Rate = Remaining Useful Life ÷ Sum of the Estimated Useful Life Years × 100%
   Annual Depreciation Amount = (Original Value of Fixed Assets - Estimated Net Residual Value) × Annual Depreciation Rate
   For example, with an original value of 500,000 yuan, a useful life of 5 years, and a residual value rate of 4%, the sum of the years is 1 + 2 + 3 + 4 + 5 = 15. The first-year depreciation rate is 5 ÷ 15 ≈ 33.33%, and the depreciation amount is (500,000 - 20,000) × 33.33% ≈ 158,000 yuan.

II. Precautions

1. Method Consistency: Once the depreciation method is determined, it should not be changed arbitrarily to ensure the comparability of financial reports.
2. Adjustment for Actual Wear and Tear: Due to the special structure of prefabricated panel houses (such as long age and material aging), it is necessary to adjust the theoretical value based on actual wear and tear. For example, if the house has serious cracks or corrosion, the useful life can be appropriately shortened or the depreciation rate can be increased.
3. Reference to Market Value: When evaluating old houses, factors such as location, structure, and market conditions should be comprehensively considered. The law clearly requires that house compensation should be assessed based on market value rather than relying solely on depreciation calculation results.

Summary: The depreciation of prefabricated panel houses should be calculated using an appropriate method based on their purpose (such as self-use, rental, or demolition compensation), strictly follow tax regulations and actual wear and tear conditions, and consult professional institutions for evaluation if necessary.