If you own your mutual fund/ETF in a taxable account and are paid interest, you will receive a Form 1099-INT at year's end. Interest you receive from U.S. Savings Bonds and Treasury obligations will be reported in Box 3 of that form. Just enter the form into the appropriate section of TurboTax.
https://www.irs.gov/pub/irs-pdf/f1099int.pdf
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
