American Institute of Certified Public Accountants (AICPA) - http://www.aicpa.org
IRS - Department of Treasury - http://www.irs.ustreas.gov
Alaska Department of Revenue - http://www.revenue.state.ak.us/index.htm
Arizona Department of Revenue - http://www.azdor.gov
California Franchise Board - http://www.ftb.ca.gov/
Colorado Department of Revenue - http://www.taxcolorado.com
Delaware Division of Revenue - http://www.state.de.us/revenue/
Florida Department of Revenue - http://www.myflorida.com/dor/
Georgia Department of Revenue - http://dor.georgia.gov
Hawaii Department of Taxation - http://www.state.hi.us/tax/tax.html
Idaho State Tax Commission - http://www.state.id.us/tax/home.htm
Illinois Department of Revenue - http://www.revenue.state.il.us/
Kentucky Revenue Cabinet - http://revenue.ky.gov
Maine Revenue Services - http://www.state.me.us/revenue/homepage.html
State of Maryland Comptroller of the Treasury - http://www.comp.state.md.us/
Massachusetts Department of Revenue - http://www.dor.state.ma.us/
Michigan Department of Treasury - http://www.michigan.gov/treasury
Minnesota Department of Revenue - http://www.state.mn.us/ebranch/mdor/index.html
New Hampshire Department of Revenue Administration - http://www.state.nh.us/revenue/
New Jersey Division of Taxation - http://www.state.nj.us/treasury/taxation/
New Mexico Department of Revenue - http://www.state.nm.us/tax
New York State Department of Taxation and Finance - http://www.tax.state.ny.us/
North Carolina Department of Revenue - http://www.dor.state.nc.us/
Ohio Department of Taxation - http://www.state.oh.us/tax/
Oklahoma Tax Commission - http://www.oktax.state.ok.us
Pennsylvania Department of Revenue - http://www.revenue.state.pa.us/
South Carolina Department of Revenue - http://www.sctax.org
South Dakota Department of Revenue - http://www.state.sd.us/drr2/revenue.html
Texas Windows on State Government - http://www.window.state.tx.us/
Utah State Tax Commission - http://tax.utah.gov/
Virginia Department of Taxation - http://www.tax.virginia.gov
Washington State Department of Revenue - http://dor.wa.gov
Wisconsin Department of Revenue - http://www.dor.state.wi.us
Wyoming Department of Revenue - http://revenue.state.wy.us/