• Where is my refund?     

 https://www.irs.gov/refunds

• How to obtain Tax Return or Wage and Income Transcript
  

https://www.irs.gov/individuals/get-transcript

• How to apply for an ITIN (Individual Taxpayers Identification Number)

https://www.irs.gov/individuals/individual-taxpayer-identification-number

• "Am I paying enough taxes?" - Withholding Calculator

https://www.irs.gov/individuals/irs-withholding-calculator

• IRS Interactive Tax Assistant – Get Answers to Tax Law Questions

https://www.irs.gov/help/ita

• IRS Help for Individual Taxpayers - IRS Services Guide

https://www.irs.gov/pub/irs-pdf/p5136.pdf

• How to avoid tax scams – IRS video and consumer alerts
  

https://www.irs.gov/newsroom/tax-scamsconsumer-alerts

• Find your local Taxpayer Assistance Center

https://www.irs.gov/advocate/local-taxpayer-advocate

• Need help resolving your issue with IRS? Phoenix Community Legal Services, Inc. may be able to assist
  

http://clsaz.org/taxpayer.html

• Arizona Department of Revenue (ADOR) information
  

https://azdor.gov/individual-income-tax-information

• I don't live in Phoenix and need help filing a tax return

https://www.irs.gov/individuals/find-a-location-for-free-tax-prep