Indeed, it could be an excellent idea. On paper at least. But you're right, it could be difficult to implement. For one thing, how would a flat tax affect low-income earners, large families, pensioners, etc.? It's not easy to answer, but with what we have now, there would be huge inequalities. Very rich people would become richer, while poorer people would become poorer.
On the other hand, citizen participation in budgeting and monitoring public spending could considerably improve transparency and accountability.
In any case, it's all very interesting. It's a shame I don't know enough about politics. It would help me understand a lot of things in everyday life!
The flat tax would save most people money except the highest earners. No tax breaks or loopholes. Most people that are low wage or pensioners pay more than that in taxes as it is already so this flat tax or 7% would actually be an improvement for them.
I suppose it would depend on the country. In France, the poorest people pay no tax, which is very advantageous. And I think introducing a tax of 7% or 10% would just end up generating a revolt, something I don't want to see. And yet, I get the impression that we're pretty close to it, listening to everything that's going on in my country.
The people most affected by taxes are the middle class. At the end of the day, the lower middle class has a harder time getting by at the end of the month than the poorest.