[woobar]

Your links show that take home pay is higher in California ($72K vs £55K/$69K), despite higher tax rate.

[dragonwriter]

This is a result of including employee-share payroll tax (FICA) in the California tax total, but not including the UK equivalent (employee share of “National Insurance”), which is listed after the “total tax due”, as part of the UK tax total.

[ta1243]

Broadly equivelent to employee part of healthcare contributions in the us