If a rental situation is owner-occupied and areas shared by lodgers and the owner are prorated for tax purposes, can an unfinished basement, treated as a common area to all equally, also be written-off on a pro-rata-share basis as a business expense?

Additional detail:

  • Unfinished.
  • Not a legal bedroom (nor to be used as one).
  • It would simply be a common area to anyone who resides there for any purpose ie. recreation, storage, hiding from tornadoes, etc.
  • In Michigan, USA
  • 1
    How do you account for kitchen access? Commented Nov 9, 2021 at 20:06
  • 1
    Do you have legal access to the basement, for example to store your things? This isn't quite clear to me from your edit. Also - does the basement have any specific costs associated, or are you talking about whether you need to apportion the allowed depreciation / utilities etc.? Commented Nov 9, 2021 at 20:25


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