Deductions & credits

"OR

Step by Step

Federal

Deductions & Credits

Mortgage Interest, Refinancing and Insurance Click Update

Click Done

Click Yes, one or both of these situations apply to me. And Continue

Enter the Adjusted amount and Continue"

 

@KrisD15 's instructions worked for me. I used the downloaded version for Mac of TT. I just had to change the $0 at the end to the mortgage interest $ amount (literally just to the left of it) and everything went through fine.