Paying tax is everyone's national and social obligation, I don't think it would be good if you skip paying it and probably you're putting yourself on harm. If your government impose tax on it then better to pay it forward. Here in our country there's no tax implications on bitcoin - none as of the moment. But at the time we convert it to bitcoin and usenit for purchasing then that's yhe time we are paying our tax. However if the government impose tax on btc then I'll do my part.