Deductions & credits

My loan was sold and interest wasn’t included for the second lender.  This worked to correct the total deductible interest from the 1098’s from both lenders.  I knew the total amount of deductible interest for the year, but entered the total for the first lender only because the second wasn’t available yet and I didn’t calculate manually what the split between the two were. I was shocked when I corrected the amount for the first lender and added the second and the taxed due increased.  I looked at the form and it didn’t include the deductible interest for the second lender.  I searched for answers and this method was the first one to correct the program flaw.  My mortgage was under $100k.