A county gov't has forced my client to install a heftier septic system for her shopping mall.  The system cost $122,000 and was paid for in 2019.  Now... what to do with this?  Is it eligible for bonus depreciation?  How about Sec 179?  Does it have to be depreciated?  I've seen IRS rev procs saying that a septic system has an indeterminable life and thus not depreciable... I've also see people argue that it should be depreciated for 39 years.... So confused... Can't tell how the new rules affect this...