- Internal Revenue Servicewww.irs.gov
- Department of Assessments and Taxation – Maryland.govwww.dat.maryland.org
- National Association of Enrolled Agentswww.naea.org/MemberPortal
- National Society of Accountantswww.nsacct.org/index.asp
- National Institute of Tax Professionalswww.nitp.com
- National Association of Tax Professionalswww.natptax.com
- American Institute of Professional Bookkeeperswww.aipb.org
- IRS – Enrolled Agentswww.irs.gov/taxpros/agents/index.html
- Office of Professional Responsibilitywww.justice.gov/opr
- Better Business Bureauwww.bbb.org
