Of course you can enter your mortgage interest as an itemized deduction on Schedule A.
However, many taxpayers will no longer need to itemize since the Standard Deduction have increased.
Your total itemized deductions must be greater than the standard deduction for your filing status to have any tax benefit.
Standard deductions for 2018
Do you think you will have enough to itemize this year? This year the Standard Deduction will be doubling so many people will be switching to the Standard Deduction. And there is a max 10,000 limit (5,000 MFS) of property tax and state taxes "SALT".
FAQ on 2018 changes <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/4482394-how-will-tax-reform-affect-my-2018-federal-tax-return">https://ttlc.intuit.com/questions/4482394-how-will-tax-reform-affect-my-2018-federal-tax-return</a>