The United States Computer Emergency Readiness Team has issued tips on preventing and responding to identity theft. Individuals who are affected by identity theft should file a report at https://www.identitytheft.gov/. On that site, an individual can report the theft, get a recovery plan, and put the plan into action. The site has checklists and sample letters to help make the recovery process easier.
US-CERT recommends the following steps to avoid identity theft: