That is the thing here. It is easy to cut tax rates. Depending on the people getting their rate cut, nearly every politician will try and pass it.
However, outside of some extreme hardliners, nearly every member of Congress will not cut spending that directly effects their constituents. That is why spending always passes. For a lot of GOP, quite a few of their districts are in areas where military bases are located. Or factories that actually make tanks, guns, ammo, jets or other military equipment. So as much as Musk will beg, plead, bleat, whinny or moo about cutting, he will have a far harder time getting much of much cut in the House, let along the Senate. Especially now since the house GOP literally only has a buffer of about 2 votes.
Remember the time Trump bitched and moaned that he was forced to sign a budget that he didn't like because Congress was going to override his veto because it involved the military? Pepperidge Farms remembers.
https://apnews.com/article/business-...1e26a366666257
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Tax cuts do not inject anything into the economy. They return funds to the people or corporations that benefit from them. However, outside of the poor or middle class, the rest of the tax cuts(which majorly effect only the rich or big corporations), they either go into bank accounts that don't do much of much or get returned to shareholders which, for all intents and purposes, do the exact same thing as get put into bank accounts.