That was 50 years ago. The top rate was 75% for income over £20k (something like £250k in todays money). Now how many people were in this category, or how they managed to avoid appearing to have that much income I don't know.

I think income tax was even higher during WW2, but that's pretty much a special case.

Also in the UK. When you take into account the council tax and national insurance (extra income tax by another name), the effective tax rate for is easily above 50% for most "high earners". And that is without considering fuel duty, VED, VAT etc.

No, you'd have to be earning an enormous amount to pay 50% tax in the UK. If you earn e.g. £150k, you get to keep £90k. Only £7000 of the money withheld is NI, so NI doesn't make that huge of a difference. Council tax isn't going to cost you £15,000 a year [1], so you're pretty clearly keeping more than 50%.

[1] If you're paying £15,000 a year in council tax, you must have some kind of gigantic property whose maintenance costs would dwarf that figure anyway.

Gah, you're right, I accidentally added an extra zero to my council tax!

My effective rate is actually 40%, not 50%. (although this doesn't include VED, fuel duty, insurance tax, alcohol tax, tobacco tax, flight taxes, VAT or any of the myriad of little taxes here and there)