@TaxGuyBill wrote:

Get the Transcripts and/or copies of the tax returns from the IRS.  That way you can actually SEE the 4562 for all years.

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TGB,

Are 4562s included in transcripts if they're not required to be filed?  You don't need to file the form every year, only if you have listed property or are adding new assets.  We know now that autos are not involved but even with autos on a Sch C you can report on C pg 2 if you have no other reason to file a 4562.

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Another problem is that I don't think 200%DB exists for 15 year property.

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I'll admit, I got lost in all of the rules in that time period.  They kept changing and I managed to survive with various de minimis / safe harbor elections and/or carefully navigating through the BAR rules to call things repairs (honestly I'm just calling it luck at this point).

OP,

I would try running though a mock return for 2017 and then roll the assets forward to get the depreciation each year until you have the beginning balance in accumulated depreciation for everything.  If you really like spreadsheets, you can use the percentage tables but you'll have to use the MQ tables for the percentages.  Looks like everything was placed in service in 4Q of 2017 so it shouldn't be too bad.

Rick