there are three basic items used to compute the 199A deduction
1) qualified business income for a 1065 k-1 would generally be on lines 1,2 or 3 less any section 179 deduction (this is what Turbotax wants) and also reduced for items not on those lines as follows:
50% of SE tax, SE health insurance, qualified retirement plan contributions associated with the business and any other business expenses deducted that relate to it (like a home office deduction). turbotax does this calculation based on other entries
2) w-2 wages
3) and unadjusted basis of qualified property.
self-employment income may or may not be the same as qualified business income
3) is defined as follows
The term “qualified property” means, with respect to any qualified trade or business for a taxable year, tangible property of a character subject to the allowance for depreciation under section 167—
(i)which is held by, and available for use in, the qualified trade or business at the close of the taxable year,
(ii)which is used at any point during the taxable year in the production of qualified business income, and
(iii)the depreciable period for which has not ended before the close of the taxable year.
(B)Depreciable period
The term “depreciable period” means, with respect to qualified property of a taxpayer, the period beginning on the date the property was first placed in service by the taxpayer and ending on the later of—
(i)the date that is 10 years after such date, or
(ii)the last day of the last full year in the applicable recovery period that would apply to the property under section 168 (determined without regard to subsection (g) thereof).
