Add up the IRS cut, state and local, gas tax, sales tax, fees to use services already paid for with taxes and are basically required for life in the US (road tolls, document fees, vehicle registration fees, public transit fares, etc), costs for compliance with laws like hiring someone to help you file taxes or taking a day off work to renew your driver's license, higher costs for goods and services due to monopolies granted by government (drug patents where the same drug costs a quarter of what it does in the US everywhere else the world, higher than otherwise internet fees paid to entities like Comcast who are granted monopolies, hospitals that are expensive due to monopolies granted by certificates of need, etc), inflation caused by money printing to pay for foreign wars without broad popular support, housing that is more expensive due to policies that benefit homeonwers at the expense of those without assets etc, etc.
Its way more than half of your productivity that is taken, if you are productive and earn wages. Those earning capital gains are hit about half as hard, another happy little accident that benefits primarily the wealthy and powerful to add to my list above.
Oh and the best part, after paying those taxes for decades once you get sick, all of the sudden, the government and the medical industrial complex doesn't have the money to help you. You get to live in a cardboard box under a overpass.