Your mortgage origination date should be shown on your 1098 you received from your mortgage company in Box 3.
The information is more critical if your mortgage is more than $750,000. If your mortgage originated after December 2017 and is for more than $750,000, the amount of interest you can deduct is limited to the interest on $750,000.
If your mortgage originated before December 2017, you can deduct the interest on up to $1,000,000 on a mortgage.
Deducting Mortgage Interest and Property Tax
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