The abolition of all taxes
Since the pirate party is a modern party this idea relates to the future.
Because in the future, definitely in the far future, all work gets done by robots en machines and then all the governments will have to make money out of nothing for all the civilians who no longer have to work. When all governments print money without inflation. And then everyone will realise that all the governments could have made money out of nothing much earlier for the necessary and useful things in their annual estimates and that by doing so they could have gotten rid of all taxes. And this also without causing inflation.