Accounting

STATE AND LOCAL

1. Federation of Tax Administrators: State Comparisons
   Website: http://www.salestaxinstitute.com/resources/rates
   
   Shows current state income, sales, and excise tax rates and related tax data.
    
2. Payroll Taxes: State Tax Research
   Website: http://www.payroll-taxes.com/state-tax/arizona
   
   Describes payroll withholding requirements and rates at the federal and state levels for everything from social security to unemployment insurance. Includes minimum wage and termination pay requirements.
    
3. Sales Tax Rates
   Website: http://salestaxinstitute.com/sales_tax_rates.php
   
   Lists the sales tax rate and range of local rates for each state.
4. State Tax Policy and Data
   Website: http://taxfoundation.org/tax-topics/state-taxes
   
   Reports on the tax and spending policy of each state and provides rankings in various categories.

INTERNATIONAL

9. EIU Country Commerce and Financial Services Reports
   Database (ASU access only): https://libguides.asu.edu/econointelunit
   
   Describes the operating conditions and tax laws for commercial entities and financial services in major countries around the world.
    
10. KPMG Taxation of International Executives
    Website: https://home.kpmg.com/xx/en/home/insights/2009/06/taxation-international-executives.html
    
    Offers booklets for countries worldwide on handling taxes and social security for employees assigned overseas.
11. Worldwide tax summaries online
    Website: http://www.pwc.com/gx/en/tax/corporate-tax/worldwide-tax-summaries/taxsummaries.jhtml
    
    Summarizes key elements of corporate and individual taxes in 117 countries worldwide, covering tax rates and major features of the tax laws.

STATE AND LOCAL

1. Arizona Department of Revenue Reports and Research
   Website: www.azdor.gov/ReportsResearch.aspx
   
   Provides access to various tax reports including the monthly Tax Facts summarizing all state tax collections as well as transaction privilege taxes at the state, county, and city level.
    
2. State and Local Governments Tax Collections
   Website: https://www.census.gov/topics/public-sector/taxes.html
   
   Reports the taxes collected in each state for up to 25 tax categories, and gives quarterly estimates of state and local tax revenues.

NATIONAL

3. IRS Tax Statistics
   Website: http://www.irs.gov/uac/Tax-Stats-2
   
   Compiles statistics on taxes paid to the IRS by businesses and individuals.
    
4. Tax Foundation: Data
   Website: http://taxfoundation.org/data   
   
   Provides data tables on tax rates, collections, and tax burdens at the state and federal level.

INTERNATIONAL
 

5. World Tax Database
   Website: http://www.bus.umich.edu/otpr/otpr/default.asp
   
   Collects historical data on tax revenues, government expenditures, and tax rates for countries and U.S. states. Covers 1913, 1927, 1932, and 1934-2000 but data can be spotty in some areas.