Are there any countries with good, reasonable tax systems? I'm only familiar with Canada and the USA, both of which are a bit of a mess, though seemingly in different ways. I'd be very interested in hearing what the process is like in other places.
The EU has VAT (value added tax) which is added to each purchase. At the end of the year, there is nothing to report and nothing to pay. It doesn't get much simpler than this.
Each country in the EU has different income tax systems and other types of tax. VAT is just one aspect that generally doesn't cover even half of the tax burden.
OP is talking about the overall tax system.