The usual route is to do the study now and file Form 3115 (change in accounting method).

It sounds like you’d definitely benefit from doing a study since your wife qualifies as a real estate professional.

This is relying on a 35% expense ratio, which I believe many would argue is conservative and should be higher.Round Number Case Study:$12,000 Monthly Collected rent$4,200 Monthly Expenses (35% Assumption)$7,800 NOI$7,800/$500,000 = 15.6% cap rate

Some correctionBonus depreciation is now 100%Are you sure you got a cost segregation study from the company you provided a link to(KBKG)?

I have been looking at Cost Segrigation and 100% bonus depreication.Has anyone ever done one for a single family home portfolio?How much was it?Was it worth it?

Quote from @Sean O'Keefe: Quote from @Damon Silver: We're looking to do a cost segregation study on our duplex in Corvallis. 

Quote from @Wayne Wollesen: I have a single STR and will need to get a cost segregation study (specifically an engineering study) done for this year.

Can you recommend how I should go about finding a good firm to do this study in North Alabama?

Timing of conducting cost segregation study also matters. 

I just finished a CCIM-style breakdown of a 10-unit multifamily near Myrtle Beach that recently traded. In short: $558k gross, ~9% cap, modeled cash-flow of ~$92k/yr with professional management (or ~$140k if self-m...