How do I start a 1041 return?

[Carl]

You need TurboTax Business for that. (Different from Home & Business). TurboTax business is for non-living, non-breathing taxable entities, such as a partnership, S-Corp, C-Corp, estates and trusts.

TurboTax business is not available as an online product, or for MACs. It's for the Windows operating system only. You can purchase the CD and download the installation file at https://turbotax.intuit.com/small-business-taxes/  But you will probably find the CD itself significantly cheaper if you purchase it over the counter at your local authorized retailer.

Note that TurboTax Business can not be used to file a 1040 of any type. It is only for filing a tax return for a non-living, non-breathing taxable entity. You also can't use it for filing a tax return for an NPO. (Non Profit).