Where I can input the mortgage interest ?How can I make a copy for the last year tax?

Your 1098 (Mortgage Interest Statement) shows how much mortgage interest, points, and (oftentimes) real estate/property tax you paid in the previous year.

If you didn't get your 1098 from your mortgage company by early February, you might be able to find this information on January's mortgage statement. Contact your lender if you think that your 1098 is missing information or if you need help deciphering it.

Here's how to enter your mortgage interest statement in TurboTax:

1. With your return open, search for 1098 and select the Jump to link in the search results.
2. Follow the instructions to enter your 1098 info.

Source: TurboTax FAQ and video

You can access your prior year returns using the Documents tab in the navigation. 

When you sign in, make sure you're using the same TurboTax account (with the same username) as in prior years.

1. Select Documents from the navigation when it appears.
2. Use the drop-down menu at the top of the screen to choose the tax year you want and then select Download PDF.

Want to download your customer data including your prior year returns? Sign in to TurboTax and select Intuit Account to access all your data in accordance with our updated privacy policy. Source: TurboTax FAQ