@pryoung I'm sorry. In re-reading my advice I feel like I wasn't clear.
You WILL file form 3115. You will file it with your 2018 tax return AFTER you calculate the total amount of depreciation that you didn't take for the prior years. Form 3115 is going to allow you to take depreciation in 2018 and going forward. So you need to file it.
What form 3115 does not do - and what I was trying to explain and apparently doing a bad job at - is allow you to go back more than three years and get the depreciation you missed out on. That depreciation is just gone. You will need to calculate it in order to get the starting point for where you're picking up in 2018 and it will be your jumping off point going forward.
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