Can I deduct my expenses associated with required credentialing and certifications as a nurse practitioner

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Are you a W-2 employee or are you self-employed?   

If you are a W-2 employee

-W-2 employees cannot deduct job-related expenses on a federal return.  Job-related expenses were eliminated as a federal deduction for W-2 employees by the tax laws that changed for 2018 and beyond.  Your state tax laws might be different in AL, AR, CA, HI, MN, NY or PA.

https://ttlc.intuit.com/questions/4482873-which-federal-tax-deductions-have-been-suspended-by-tax-re...

If you are self-employed---then those expenses can go on your Schedule C