Wall Street may find the need to freak out over whether the Fed is going to raise rates, but for Main Street, the concern is more remote.

That's because most consumers will feel little impact should the U.S. central bank decide to enact a quarter-point hike. In fact, for 9 out of 10 people holding variable-rate loan or credit card debt, the typical impact will be a few dollars a month, according to a study that credit information service TransUnion released Monday.