here is the tax law regarding former employees for purposes of the QBI
REG 1.199A-5(d)(3)
(i)Presumption. Solely for purposes of section 199A(d)(1)(B) and paragraph (d)(1) of this section, an individual that was properly treated as an employee for Federal employment tax purposes by the person to which he or she provided services and who is subsequently treated as other than an employee by such person with regard to the provision of substantially the same services directly or indirectly to the person (or a related person), is presumed, for three years after ceasing to be treated as an employee for Federal employment tax purposes, to be in the trade or business of performing services as an employee with regard to such services. As provided in paragraph (d)(3)(ii) of this section, this presumption may be rebutted upon a showing by the individual that, under Federal tax law, regulations, and principles (including common-law employee classification rules), the individual is performing services in a capacity other than as an employee. This presumption applies regardless of whether the individual provides services directly or indirectly through an entity or entities.
(ii) Rebuttal of presumption. Upon notice from the IRS, an individual rebuts the presumption in paragraph (d)(3)(i) of this section by providing records, such as contracts or partnership agreements, that provide sufficient evidence to corroborate the individual's status as a non-employee. Presumption. Solely for purposes of section 199A(d)(1)(B) and paragraph (d)(1) of this section, an individual that was properly treated as an employee for Federal employment tax purposes by the person to which he or she provided services and who is subsequently treated as other than an employee by such person with regard to the provision of substantially the same services directly or indirectly to the person (or a related person), is presumed, for three years after ceasing to be treated as an employee for Federal employment tax purposes, to be in the trade or business of performing services as an employee with regard to such services. As provided in paragraph (d)(3)(ii) of this section, this presumption may be rebutted upon a showing by the individual that, under Federal tax law, regulations, and principles (including common-law employee classification rules), the individual is performing services in a capacity other than as an employee. This presumption applies regardless of whether the individual provides services directly or indirectly through an entity or entities.
(ii) Rebuttal of presumption. Upon notice from the IRS, an individual rebuts the presumption in paragraph (d)(3)(i) of this section by providing records, such as contracts or partnership agreements, that provide sufficient evidence to corroborate the individual's status as a non-employee.
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You may have to rebut this presumption upon notice from the IRS by providing records such as contracts or partnership agreements that corroborate your status as a non-employee. For more information on whether you are an employee or an independent contractor, see Pub. 15-A, Employer’s Supplemental Tax Guide, and Pub. 1779, Independent Contractor or Employee.
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you can also prepare IRS form SS-8 for your own use to determine if you are an employee or an independent contractor. by answering the questions you should be able to get an idea of how the iRS would rule. you can submit this form to the IRS to make the determination for you but don't expect a quick response.
https://www.irs.gov/pub/irs-pdf/fss8.pdf . in short there is no one factor that makes you an independent contractor vs an employee
