This is the opposite it was a tax cut for large businesses at the expense of middle class/upper middle class families in high tax areas such as NY, NJ, and CA.
Corporations were exempt from this bill
Most of these tax cuts went to business making around 200k-300k, that's not exactly a small business. Also businesses making over 500k saw a nearly 10% decrease in the tax rate
Question, did you read the bill? Cuz the brackets literally created cuts for a new bracket lower than $13k and rose taxes for those making $1M+. It was far from a conservative and big-business defending bill.