Assuming the payment you receive from the sale of the house is to satisfy the alimony obligation, whether or not it is taxable is dependent on the date the divorce was finalized. If the date of finalization was January 1, 2019 or later, the alimony received will not be taxable. If December 31, 2018 or earlier, it is taxable to the recipient and deductible to the payor.
https://turbotax.intuit.com/tax-tips/marriage/filing-taxes-after-a-divorce-is-alimony-taxable/L3RVrB...
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