Is the interest on a SBA disaster loan tax deductible?

assuming you used the loan proceeds to rebuild your business and not take a trip around the world for personal pleasure the interest would be deductible and reported on the same form where the activity is reported.

Where is the interest on the disaster loan entered into TurboTax?

You don’t specify what your business type is in your post, but if you’re self-employed, the interest would be claimed on Schedule C, where you report your self-employment income.

To enter your Self-Employment Income and Expenses in TurboTax Online:

1. If you’re on the Hi TurboTax Client, let's keep working on your taxes! screen, click the Pick up where you left off button
2. Click Federal in the left pane, if you’re not already there
3. Click Income & Expenses in the banner
4. Click Show more to the right of Self-Employment
5. Click Start to the right of Self-employment income and expenses
6. Click Yes on the Did you have any self-employment income or expenses? page

There’s a special category for interest expenses.

If you’re not self-employed, please post back with more information.

@RonLF

This wasn't for a business.  It was for a home - primary residence.

If you have a loan that is secured by your house, then you would enter the interest paid in the home section by clicking Federal>>Deductions and Credits>>Show more next to Home>>Start next to 1098.  You would enter the information in the 1098 form area, then select you do not have a 1098 form.

If the loan is not secured by your home, then the interest is not deductible.