By your reference to "current year" I assume you are working on y our 2020 tax return.
All you need is the IRS Form 4562's from the 2019 tax return for that specific rental property. There are two of them and they both print in landscape format. One is titled "Depreciation and Amortization Report" and the other is "Alternative Minimum Tax Depreciation". You'll probably only need the first one. But have them both just in case.
All the information you need is on the 2019 form 4562. Make sure you enter the data for each item "exactly" as it appears on the 2019 form 4562. There is one exception, and it's *IMPORTANT" you get this exception right.
In TurboTax 2020 you will be asked for "prior year's depreciation already taken". To get that total look at the 2019 form 4562. On that 2019 form 4562 you have to add together the amounts in the "prior years depreciation" column and the "current year depreciation" column. The total will be what you will enter in TurboTax 2020 when asked for prior year's depreciation already taken. You get that wrong, and your 2020 depreciation amount will *not* be correct.
