Flipping but won't be done until next calendar year, tax advise?

[Philip Johnson]

Hi,

My first post!

I have a house that I am doing a full-time live-in flip on.  I am complete rehabbing the front unit, and then adding on/converting garage into 2 bedroom house.

Problem is, I won't be done until next year.  I file a schedule E with itemized depreciation of improvements.  Can I claim 2019 expenses in 2020? Otherwise, all of those deductions will be lost?