Deductions & credits

Could you tell me where "As long as the structural repairs and improvements are completed and paid for within two years from the closing of the loan ... "   comes from? I did not see that in the IRS Pub 936.

 

Also, our remodeling will cost less than our 2021 cash-out amount, but we don't know yet how much it will be. Can we increase the acquisition debt portion of our 2021 refinance in 2022 or 2023 when we finalize the remodeling costs? How about in 2024?

 

Thanks.