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Can value from labor provided to oneself be taxed?
I've heard of handyman type people making a living this way untaxed.  They move into a fixer-upper, fix it up while living there, stay over two years and sell.  They can pocket $125k/yr tax free this way assuming they produce that much value in their fixing-up.  (Beware, though, that this will bite you in low social security payments in retirement!)