Capital Gains on Flip

[Donald DiBuono]

I bought a flip, which i lived in, for 22 months. Month 22 i sold the house. It was under my understanding that since i lived in the home i could deduct all upgrades to the property and pay a prorated amount of capital gains since i lived in the property 22 out of 24 months. For example i would take my profit multiply by 20% capital gain and then multiply by (1-(22/24)). Am i wrong in this assumption?