If it's for interest you received, treat it as you would a 1099-INT:
1.
Click Federal
on the left-hand side menu.
2.
Click Income
across the top.
3.
Scroll down to Interest and Dividends and click Show more.
4.
Click Start
or Revisit by Interest on 1099-INT.
If it's for interest you paid, you can't deduct it UNLESS it's secured by your personal residence. In that case, it's treated as mortgage interest:
1. Click Federal
on the left-hand side menu.
2. Click Deductions
& Credits across the top.
3. Scroll down to Your Home and click Show
more.
4. Click Start
or Revisit by Mortgage Interest, Refinancing, and Insurance (Form 1098).
