Deductions such as the ones you listed will lower your self-employment income. That, in turn, will reduce the amount of Self-Employment tax which is due.
Note that if you are contributing to a SEP, reducing your self-employment income also reduces the amount aht you can ut into a tax-advantaged account.
@johnb974 wrote:
From what I'm reading, I can write off a new computer and printer to lower my Self Employment tax. I've been wanting to get a Surface Pro for mystery shopping.
Shopping Southeast Pennsylvania, Delaware above the canal, and South Jersey since 2008