Almost exactly how it works in the US: shop price tags are the price you actually pay the shop, excluding the amount you pay the government for being allowed to shop there, and you have to do an annual tax return, calculating - and showing you - how much tax you're actually paying. (Some does get deducted each month, to spread the load - but unlike PAYE, *you* control the amount deducted, then pay or receive the difference at the end of the tax year.)

Slightly less convenient, of course, but it does make tax much more transparent to those paying it - in the long run, a win for democracy I think.