Most employees pay far more National Insurance than Income Tax
The 'earnings threshold' for NIC is lower than the personal allowance for income tax; and for basic rate taxpayers, total NIC is 25.8% of earnings above the threshold but income tax is only 20% of earnings above the personal allowance.
At the top of the basic rate band, it's £9,786 NIC and £6,900 income tax.
Above that, it flips over, NIC is 'only' 15.8% of earnings but income tax is 40%.
The break-even point at which you pay the same amount of NIC as you do income tax is about £58,300, ...