In an interview with Parade magazine, Mitt Romney offers another reason why he would rather not release his tax returns -- Mormon tithing is not supposed to be public.

"Our church doesn't publish how much people have given," Romney said, according to the Salt Lake City Tribune. "This is done entirely privately. One of the downsides of releasing one’s financial information is that this is now all public, but we had never intended our contributions to be known. It’s a very personal thing between ourselves and our commitment to our God and to our church."

Members of The Church of Jesus Christ of Latter-day Saints are supposed to give 10 percent of their income to the church every year. In recent years, according to the tax information he's released Romney has given that and donated much more through his family's charity.

The magazine comes out Sunday; here are more advance excerpts.