The double declining balance (DDB) method of depreciation, also known as the 200% declining balance method of depreciation, is a form of accelerated depreciation that involves multiplying an asset’s beginning book value by a depreciation rate.

This method is used with assets that lose value quickly as it tends to be larger at beginning of an asset’s life and smaller later on.

**Formula to calculate DDB.**

**Example:**

Suppose a project’s has 10 useful years, calculate the DDB.

Therefore, your double declining balance is 20%.