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@swarren69 wrote:

I read with interest your reply about allocating gain on a monthly basis.  What are you talking about?  I’ve never heard of such a thing. 

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Look up "Nonqualified Use", from §121(b)(5).

And 2018-2021 averages 3 years of rental use.  It depends on the dates (it could be as little as 2 years, 1 day, or as much as 3 years, 364 days).  So depending on the dates, a person could qualify for the exclusion.