Here's a quick summary of the forms you mentioned and their availability in TurboTax, along with links to check their availability and a link to Sprintax:
- Form 8879: Not supported for individual users in TurboTax. Check availability.
- Form 1120/5472: TurboTax supports Form 1120, but Form 5472 may require additional steps. Check availability.
- Form 1040NR: TurboTax does not support this form, but you can use Sprintax to file your nonresident alien tax return. Check availability.
