How do I report interest paid to me by the IRS? Turbo tax will not give me a place to enter a 1099-INT unless it comes from a financial institution.

You report interest paid to you by the IRS exactly as a form 1099-INT.

In TurboTax Online, you can enter your form 1099-INT by following these steps:

1. Open your tax return
2. Click on Federal in the left-hand column, then on Wages & Income 
3. Locate the section Interest and Dividends and click on the arrow on the right
4. Click Start next to Interest on 1099-INT.

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. On the Let Us Enter Your 1099 page go down to the bottom and pick Enter a different way

Federal
Wages & Income
Interest and Dividends
Interest on 1099INT - Click the Start or Update button

Put the interest amount in box 1