Bonus Depreciation, safe harbors and Partial asset disposition

[Marlie Evans]

Now using the de minimis/routine maintenance safe harbors instead of bonus depreciation for appliances, carpet and the like. I don't understand why my taxes go up a few bucks when I change move an item (a kitchen appliance) from bonus depreciation to an expense on schedule E. It seem counterintuitive. Wondering if it is worth amending my last few years taxes to change all of those purchases of appliaces from depreciation to expenses to avoid future depreciation recapture upon sale. Does each year have to be amended? I saw that depreciation can be corrected on a single form.

Also I do not understand how/where to do a partial asset disposition in turbotax. I replaced two roofs on rental properties. Had not done a cost segregation study when I purchased these two homes, but understand you can calculate a value  to write off so you are not depreciating two roofs...using salvage value or producer price index. Does anyone have a spreadsheet formula for this?