Do individual 401(k) plan administration costs go on Line 14b or Line 17 of Schedule C?

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I'm a sole proprietor, and I opened an individual 401(k) plan for myself in 2021. I paid a third party company to administer my 401(k). I imagine this counts as a business expense, but should it be classified as an "employee benefit" (line 14b) or a "professional service" (line 17)? Or something else? Or is it not a valid business expense in the first place?

[MinhT1 · Accepted solution]

Yes, these administration costs are deductible when paid by your business and can be categorized as Professional services. They are reported on line 17 of Schedule C.