Of course it will kill the income tax especially in the US where taxes are crazy and illegal. It could make the end of the US government and the beginning of high unemployment which will be bad for everybody. There will be a lot of chaos I think.
if most companies adopt bitcoin for their transactions, and it will make the government can not track the company's financial turnaround, so the government can not give how much tax must be paid
Taxes are not crazy and illegal they are essential for running a country. A government without a source of income will not have anything to build projects for their country. Also it will not result into a high unemployment because the companies who are evading taxes have no problems in paying their employees' salaries.