Internal Revenue Service

https://www.irs.gov/

California Franchise Tax Board

https://www.ftb.ca.gov/

Where’s my refund?

https://sa.www4.irs.gov/irfof/lang/en/irfofgetstatus.jsp

Tracking Status of FTB

https://www.ftb.ca.gov/refund/index.asp

Withholding Calculator

https://www.irs.gov/individuals/tax-withholding-estimator