I lived in Switzerland from 2009 until Feb 2011 and now back in the US. However I just got two bills from the local Politische Gemeinde for "additional" taxes for 2010 and two months in 2011 to the tune of almost 1000 CHF. Frankly I'll ask the question, what happens if I just don't pay them? I'm fairly certain I won't be living in Switzerland in the future...
Kind of annoyed they can just come back and assess additional taxes to what I paid already with little accountability.
Its the gift that keeps on giving...
What you pay in tax during the year is always an estimate and having left the country they did the figurework to finish things off.
If you don't pay, then I wouldn't try to even visit the country in future never mind live here. There will be an order somewhere about outstanding tax not paid and they're likely to arrest you I would guess. The Swiss don't take kindly to "tax evaders". I'd pay up to clear your debt record and your name.
There's plenty of accountability. Ask them for a detailed breakdown of the figures and it will be provided without a problem. They are not just randomly asking for more money.