"Our effective tax rate was -122.2% in 2022, 18.5% in 2021, and -329.9% in 2020." - AT&T
Meanwhile the average for Americans was 25.99%.
Sources:
https://investors.att.com/~/media/Files/A/ATT-IR-V2/financial-reports/annual-reports/2022/2022-managements-discussion-and-analysis.pdf
https://www.statista.com/statistics/318079/average-tax-rate-in-the-us-by-income-percentile/#:~:text=U.S.%20average%20income%20tax%20rate%202020%2C%20by%20income%20percentile&text=In%202020%2C%20the%20average%20tax,tax%20rate%20was%2013.63%20percent.