Sold a second home constructed with installment payments to a builder over a 2-year period. Is LT capital gain calculated at end of last payment or occupancy?

[BillyCrash]

Occupancy was September 2021, but final installment was November 2021.  Do I have to wait until November 2022 to consider house a Long term capital gain?

[ColeenD3]

Income is based on money received. November is the correct date.

[BillyCrash]

Ok, thanks, makes sense.  Let me probe the concept a bit further.  If 9 of the 10 cash installments were made prior to October occupancy, and only the final made in November, could the 9 installments be considered LT gain and only the portion of profit associated with the 10th installment be regular income?  Obviously a home is different than a stock, but similar situation with stock would be LT gain for those purchases that were over 1 year, and ST gain for those less than 1 year.  Thanks.