Not if you're in the US. Social security is ~22% https://govbase.com/blog/where-your-tax-dollars-go

Not 90%[0].

Social Security is kind of a "zero-sum gain," if you believe people, because we are supposedly being paid back what we spent a lifetime, having withdrawn from our wages.

[0] https://fiscaldata.treasury.gov/americas-finance-guide/feder...