Why cant I deduct interest on mortgage loan?I have always done so. We refied in 2017, only. We put 30,000 worth of windows in the home, and we cant deduct interest?

The IRS lets you deduct your mortgage interest, but only if you itemize deductions. Revisit the mortgage interest section. You may have answered a question incorrectly. 

In addition to itemizing, these conditions must be met for mortgage interest to be deductible:

• The loan is secured, which means the lender has some kind of guarantee of payment, usually in the form of property. If a borrower defaults on payments, the lender can seize the property that’s securing the loan. If you’re buying or refinancing a home, especially if it’s your first home, the loan is usually secured by the home you’re buying or refinancing.
• The home with the secured loan must have sleeping, cooking, and toilet facilities.
• The debt can’t exceed $750,000 (or $1,000,000 if the loan was taken before December 16, 2017) in order to get the full deduction.
• You or someone on your tax return must have signed or co-signed the loan.
• If you rented out the home, you must have used the home more than 14 days during the tax year or 10% of the number of days you rented it out, whichever is greater.