Sure, it's "VAT" - but it's essentially the same thing. You pay it for almost everything you buy. There are some lower rates for food in some places. But guess what, US has that too.
Thanks for the link, but again you're taking the exception as the rule. Most countries don't work like that.
(it's also possible that social security is deductible before income tax is levied as per this site but I'm not looking too deeply into it: https://expatcenter.ro/tax-guide/ )
Romania also don't work like that, in principle. They are simply much poorer country than Norway. 30k EUR salary in Romania is upper middle class income, so it is heavily taxed. People making average wage pay much lower taxes.
Also, if I get the linked calculator right, then it expects you to put MONTHLY salary, in RONs, not EUR. So, just putting 30000 there you get a monthly salary of over 6000 EUR, or 72k per year. And that's taxed at 41%.
Romania is much poorer than Norway, but the tax is the same - it's a flat tax rate. Play with the calculator and you'll see. The numbers are in RON - which is 5 times smaller than the dollar, and the value is implied to be monthly - but it makes no difference because of the flat rate.
In other countries you might have tax brackets, but I know from experience that it's very easy to reach 45% total tax rate (not marginal).
Pretty much nowhere in Europe you're paying (effective) 40% on a 30k/yr salary. Nowhere. You're most likely not even reaching that tax level.
> New vehicle registration tax can reach 150% in Denmark
> Private cars: 25% of DKK 65,000, 85% of DKK 65,000-202,200 and 150% of the rest. https://skat.dk/skat.aspx?oid=2244599
So again you don't know how tax bands work (and Denmark is kinda of an exception)