Gov. Jan Brewer will make public on Monday her proposal to simplify Arizona's transaction privilege tax, commonly called the sales tax.

The current system is the most complex in the country, and it hampers business, Brewer and others have said.

Her office announced that she will unveil the proposal, in the form of legislation, at an 11 a.m Monday news conference in Phoenix. Supporters from the Legislature and the business community are expected to attend, Brewer's office said.

Arizona municipal leaders already have come out in opposition to one aspect of change expected to be in Brewer's proposal. It would shift the collection of tax on construction materials from wherever the construction site is to the point of purchase of materials.

“It looks like municipalities in general are going to lose substantial monies if the law as drafted passes," Tucson Mayor Jonathan Rothschild said recently. "I think in Tucson we’ve calculated about $7 million. But the mayors of Sahuarita, Oro Valley and Marana have all said that it would really cripple their cities.”