Admittedly, the nature of our government with its checks and balances sometimes makes it hard to determine what is actually unlawful, but Christians should be concerned with presenting the best example possible instead of trying to walk the tightrope of the law. Cheating on taxes is wrong. It violates law, besides demonstrating basic dishonesty. God did not ask if we liked to be taxed, but he did tell us to pay our taxes. Government excess and mismanagement never excuses breaking the law.
Christians are to live to the highest standards, obeying the laws of the land dutifully.
We do not have to like the laws to obey them, but if we are to be truly pleasing to God, we will obey them. They are for our benefit and protection. Sometimes they may pass what seems reasonable, but in this country, we are fortunate enough to have the opportunity to change them. But that does not mean we have the freedom to break them.