06/16/2010 05:12 am ET Updated Dec 06, 2017

Bill Brady Won't Release Tax Returns; Pat Quinn Calls It Disappointing (VIDEO)

Breaking with a common practice among politicians, GOP gubernatorial candidate Bill Brady won't make his tax returns public this year.

In a video recorded by the Capitol Fax blog Thursday, Brady said that he had made public all the information that the law required, and that he worried releasing his tax returns might hurt his businesses.

"Last time I did that, and I did it without realizing the effect it would have on our business," said Brady. "I don't feel there's any reason to do it. There's nothing gained by releasing that, and I'm not going to do it this time."

(Scroll down to see the whole video.)

Brady's opponent, incumbent governor Pat Quinn, has responded by saying that he finds it "disappointing" that Brady won't release his returns, according to the Associated Press. The AP reports that Quinn, who released his tax returns last year, is planning on doing the same for his 2009 taxes by the end of this week.

While not required by law, many candidates view the release of tax returns as an additional layer of transparency, to show that there's no conflict of interest between their personal finances and their political positions. Barack and Michelle Obama and Joe and Jill Biden released their tax returns earlier this week.

Watch Brady answer questions about his taxes: