Do I have to enter small business information on my 1099-NEC if I don't own a small business?

No. You don’t have to enter business info for your SPIFF payment.

Tax Champ @Hal_Al says SPIFFs are not considered to be self-employment income. They are taxable.

In Turbo:

1. Type 1099-nec in Search (magnifying glass) in the top right
2. Select Jump to 1099-nec
3. On "1099-NEC Summary," delete your SPIFF (trash can)
4. Tap +Add Another 1099-NEC and re-enter your 1099-NEC
5. On “Does one of these uncommon situations apply?” choose This in not money earned as an employee or self-employed individual, it is from a sporadic activity or hobby (this is not common), then Continue.

This will put your SPIFF payment on Schedule 1, line 21 as Other Income.

See @Hal11_2_Al’s full answer at: I got a 1099-misc for a spiff at my job paid by the product supplier now it is having me file as a business?