Sales Tax Rates in California by City and County
http://www.boe.ca.gov/cgi-bin/rates.cgi
State of California Web Payment System
https://www.ftb.ca.gov/online/webpay/index.asp
Idaho State Tax Commission
https://tax.idaho.gov/i-1017.cfm
Idaho Sales Tax Handbook by County
https://www.salestaxhandbook.com/idaho/rates
IRS Forms
http://www.irs.gov/Forms-&-Pubs
Federal Electronic Payment Tax System