Form 3115 may be a long form to fill out, however, you cannot amend to claim any type of refund for 2019. Also, you can only amend to claim a refund for 1 year prior when correcting depreciation. This would mean that for all the years you did not take depreciation, other than last year, you would not benefit by amending your returns as you would not get anything extra back.
So, your best option is to include form 3115 with your return if you want to get the most out of your money.
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