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"ABP" is an amortized bond premium. This means you purchased a bond at a certain price above par. For example, you paid $1870 for an $1800 bond. 

If you had a positive entry (>$0) on Line 11 of your 1099-INT, you would have an ABP interest adjustment. 

To manually post a 1099-INT

1. Select Federal
2. Wages & Income 
3. Scroll to Investments & Savings and 
4. select Show More,
5. Start or Revisit next to Interest on 1099-INT - Okay! 
6. Time to kick off your investments! 
7. Yes, on the screen Did you receive any interest income? then Continue.
   • If you see the screen Your investments & savings or Here's your 1099-INT info, select. 
   • Add investments or add another 1099-INT, then Continue.
8. Choose how you'd like to enter your 1099-DIV:
   • If you'd rather manually enter your form, select. 
     • Change how I enter my form, select. 
     • 1099-INT, then 
     • Type it in myself on the following screen.
9. Follow the on-screen instructions to enter the info from your 1099-INT.
10. When you reach the screen Here's your 1099-DIV info, the form you just entered should be listed.

Check the box My form has info in other boxes.

Post the information to Box 11 and [Continue]

The screen will show Do any of these uncommon situations apply?

Select I need to adjust the interest reported on my form.

Then enter your adjustment and select the reason from the drop-down menu.

If this does not completely answer your question, please contact us again and provide some additional details.