In the US, taxes are complexified to hide welfare for the rich[0] and put a burden on the non-rich people that they must fill out complicated tax forms correctly "or else." 0: This isn't idle rhetoric: That's what campaign financing buys: favorable treatment and tax law chicanery. Does anyone think it's right billionaires should pay less taxes than their secretaries?
Multiply that several times to do my US taxes and add some extra fees on top because I use tax prep software.
The really funny bit is I never owe anything in the US since I solely live and operate in Iceland so all that's covered by my Icelandic taxes, but as a US citizen I'm required to file regardless.
I wish we had raw data showing they paid less in the dollar amount. I believe this happens, I just wish we had a good idea of how common it is.
The scenario does arise when we're talking about percentages, because billionaires make much of their wealth from capital gains and the like. But it's hard for me to imagine how the actual dollar amount paid could be lower.
If you agree with the numbers you don't do anything at all.