Republican presidential candidate Mitt Romney has come under pressure to make public his tax returns: We know he pays tax, but how much tax? A moment of disclosure from the former Massachusetts governor who says most of his income comes from past investments. Most of us pay, lets say a little more: Mitt has told us he may release his tax returns in April, but his rivals want him to do so sooner. Grover Norquist, is the president of Americans for Tax Reform.