What's depreciation using double declining?

Double Declining Baldance is a Depreciation method that uses twice the straight line Depreciation Depreciation Rate.

For Example if the Depreciation is for 10 years then Straight line is 1/10 *100 or 10%

For Double Declining balance you take the 10% *2 to get the rate of 20%

to compute the rate you take the beginning year book value off the asset * rate = Depreciation Expense for the year.

for Example if the Asset cost $140,000 on Jan 1 the Depreciation Expense will be $140,000 * 20% =$28,000
The Remaining Book Value is $140,000 - $28,000 = $112,000 which is now the beginning Book value for the next year.

For a partial year you take the Beginning book value * rate * # months/12 months

For example if an asset Cost is $ 140,000 purchased on 1 Jul then the Depreciation Expense is $140,000 * 20% * 6/12 = $14,000 Depreciation Expense.