We don't need a flat tax rate to simplify the system, though. A progressive tax rate is just fine, as long as it is consistent across all types of income with n

We don't need a flat tax rate to simplify the system, though. A progressive tax rate is just fine, as long as it is consistent across all types of income with no, or few, deductions. Inheritance is income. Capital gains is income. We may still need some offsetting - it seems unreasonable to tax capital gains when moving your primary residence, for example (which the US does now, with some unnecessarily complicated value and time based offsets).