Depreciation Schedule with change in service life and residual value

Asset	Acquistion	Cost	Residual	Depreciation Method	Useful Life
GigaFactory	1/1/2020	$10,000,000	$1,000,000	Double-Declining	20

(Dec 31, 2021) Sudden changes in the operational and market conditions indicate that the sum of undiscounted future cash flows from GigaFactory is now estimated at $5,000,000. The fair value of the GigaFactory as of the date is $4,000,000. After recognizing depreciation expense for 2021 as scheduled, Tesla wrote-off the GigaFactory. The remaining service life is reduced to 8 years and the residual value is updated to $500,000. Depreciation for the Gigafactory on these new parameters will start from 2022 with the double-declining method.

Fiscal yr ending	Depreciation Expense	Accumulated Depreciation	Net Book Value
12/31/2020
(Each year until net book value = residual)