Federal income tax, state income tax and local property and sales tax. Social Security and Medicare taxes. I agree 30% is too high an estimate for below median incomes, but its closer 9-15%, according to this: https://thecollegeinvestor.com/34072/effective-tax-rates/
And if you include health insurance--which in other countries is provided for and paid for with taxes--then it goes up. A lot.
And if you include health insurance--which in other countries is provided for and paid for with taxes--then it goes up. A lot.