Two options.
Either, go back and amend the 2016 tax return to claim the entire amount.
Or, amortize the points over the life of the loan (i.e., for a 30 year mortgage you would deduct 12/360th of the points this year if you made 12 loan payments this year) and then 12/360ths every year from now on until you sell, pay off the loan or refinance.
Also, you can only deduct the amount as a lump sum if the amount of cash you brought to the table (down payment and closing costs) was at least as much as the amount of the points. If you opened the construction loan without a cash down payment, you can only use the amortization method and not the lump sum method.
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