http://www.irs.gov/

http://www.dornc.com/

http://www.sba.gov/

http://www.ssa.gov/

http://www.taxadmin.org/state-tax-agencies

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

https://www.healthcare.gov/exemptions-tool/#/

https://www.mytaxdocs.com