The population is also a lot higher now. Taking your figures and computing it on a per capita basis in the respective eras gives a 3.72 multiplier, not 7.5.
Not saying 3.72 is great, of course, but it's more accurate in terms of actual impact on people.
But I don't think the expenditure increase supports the argument that people's income is being stolen. Whether or not you consider taxation as theft is an ideological stance.
You are mistaken. Reagan's tax cuts, which included cuts for the lower class, decreased tax revenue and put more money in the average person's pockets.
Presidents after Reagan started to pillage the lower and middle class for more tax revenue. Notably George H.W. [1]
Taking what you say as accurate and complete just for the sake of argument, those tax cuts also meant that people had a greater non-tax financial burden. They also had adverse social consequences that increased costs for everybody.
The wealthy certainly did get great gains out of it, but it was at the expense of the non-wealthy because the tax cut they received was tiny and didn't offset the increased expenses.
Really? The situation isn't so simple. High income earners are paying historically low taxes.
Not to mention cuts in inheritance taxes from the 80s onward.
You'll need to explain your data more carefully than claiming it is all being stolen by taxes.
Your argument supports that tax burden has increased for the majority - if the high income folks are proportionally paying less while the total burden has increased, this a disproportionate increase has hit everyone else harder
Adjusted for inflation that would be $820 Billion/year today.
Actual spending today is $6,180 Billion/year, a ~7.5x multiplier above inflation.
Your income is being stolen through taxes and spent at an alarming rate.