"2020 IRS tax reports will not be released until next year. "
You posted 2018. Why not post 2019?
Emphasis added.
"Who Benefited Most From the Tax Cuts and Jobs Act?
Middle-class Americans saw mixed results. IRS data on the 2018 tax season released in May 2019 shows that savings for taxpayers were uneven.
For example, the average refund was $90 higher, nationally, in 2018 than 2017. But the taxpayers who saw the largest refund increases had an adjusted gross income (AGI) of at least $200,000.
Tax returns showing an AGI of less than $100,000 paid less income tax overall, but returns with an AGI just above $100,000 (many middle-class families) owed more tax, on average.
Note that this AGI is per tax return, not per taxpayer: A married couple where each spouse has a salary of $65,000 could very well have an AGI of just above $100,000 if they file jointly.
On the whole, low-income families appear to have received the least savings, while high-income families saved the most.
Middle-class families saw mixed results. The biggest winners from Trump’s tax cuts were probably businesses. Between 2017 and 2018, corporations paid 22.4% less income tax. The total value of refunds issued by the IRS to businesses also increased by 33.8% nationally."
