What we need to end is any and all public “service” (government job), benefits, which includes healthcare and retirement. Pay them a straight wage that we’re not on the hook for, for decades after they leave. While we’re at it, we can peg their wage to—in some fashion—local median wage.
Raise the price of postage and let this Constitutional Federal Program pay for itself, based on user fees. If it can’t run itself, it’s one of the few services that has valus (like roads), because we need infrastructure in case of war, natural diseaster, etc. But what we don’t need is more junk mail to bloat more government bureaucrats.
Might well have escaped your attention that it is, but that's what it is.
It's not a tax.