If you want to compare with other countries, NI can't be an afterthought. You have to include it in the income tax rate. Just because the UK doesn't call it an

If you want to compare with other countries, NI can't be an afterthought. You have to include it in the income tax rate. Just because the UK doesn't call it an additional income tax doesn't stop it from being so. Edit: and along the same lines, you need to add the "employer's contribution" to the total tax bill. In all NI works out to an additional 15% or so for someone on ~£100000. So that's about 55% in total.