How do I enter long term capital gain in Turbotax if no 1099 received?

according to both you and the company, it is interest.

@papacutler 

To start with, the IRS description of interest is simple.  So, this should be included as interest.

"interest — the charge for the use of borrowed money.

interest income — the income a person receives from certain bank accounts or from lending money to someone else.

taxable interest income — interest income that is subject to income tax. All interest income is taxable unless specifically excluded.

tax-exempt interest income — interest income that is not subject to income tax. Tax-exempt interest income is earned from bonds issued by states, cities, or counties and the District of Columbia."  IRS Interest Income

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.

• If you need to enter another 1099-INT, select Add another 1099-INT and follow Steps 4-6 above.

Note: Don't combine the amounts from two or more 1099-INT forms if they're from the same payer—enter each form separately.

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