You can't use TurboTax 2020 to complete a 2018 tax return. But if this is your first year using the program and assuming that you actually did report this property correctly on your 2018 and 2019 tax returns, then as you work the asset through you should see a default amount of $16,355 for the total amount of depreciation already taken in 2018 and 2019. Then it should show $12,662 for the total depreciation to be taken in 2020.
