Enter interest from the IRS like a 1099Int and put the amount in box 1. Enter it manually and just enter IRS for the payer. Don't enter any other info like the address or a EIN.
Enter a 1099-Int under
Federal on left
Wages & Income at top
Interest and Dividends
Interest on 1099INT - Click the Start or Revisit button
Don't enter a bank or broker name and don't try to import it. At the bottom pick - Change How I enter my Form
Then on the next screen pick I'll Type it in Myself
Enter the Payer as the IRS and the interest received in box 1 of the Form 1099-INT
Online returns -
Enter interest income in the Search box locate in the upper right of the program screen. Click on Jump to interest income
On the screen Did you receive any interest income? Click on Yes
On the next screen click on Continue
On the screen Let's import your tax info Click on Change how I enter my form
On the screen How do you want to add your 1099‑INT? Click on Type it in myself