Government Security Clearance Levels: Confidential, Secret, Top Secret

The federal government uses three security clearance levels: Confidential, Secret, and Top Secret. Each level corresponds to how much damage unauthorized disclosure of the information could cause to national security, and each requires a progressively deeper background investigation before access is granted. About 4 million people in the United States hold an active clearance, split between government employees and private-sector contractors.

A clearance by itself does not open any doors. Under Executive Order 12968, you also need a demonstrated need to know for the specific information and a signed nondisclosure agreement before you can see any classified material.¹ The person who controls the information decides whether your official duties actually require it.²

The Three Levels and the Damage Standard

Executive Order 13526, signed in 2009, defines the three tiers by a single variable: the harm that unauthorized disclosure could reasonably be expected to cause.³

Confidential — damage to national security
Secret — serious damage to national security
Top Secret — exceptionally grave damage to national security

The words are not decorative. Adjudicators, classifying authorities, and reviewing officials use those exact damage thresholds to decide what belongs at each level and what protections apply.

Confidential

Confidential is the lowest formal level. It is less common in the defense contracting world than the other two and typically shows up in specialized administrative or support roles inside government agencies.

Candidates undergo a Tier 3 investigation, the same baseline used for Secret. That includes a National Agency Check, local law enforcement records checks, a credit review, and verification of employment and education history.⁴ The traditional reinvestigation cycle was every 15 years, though continuous vetting is now replacing periodic reinvestigations across all levels.⁵

Confidential material still carries strict handling rules. Storage must be in GSA-approved security containers; storing classified information in non-approved containers has been prohibited since 2012.⁶ Mishandling at any level can result in administrative action or permanent loss of the clearance.

Secret

Secret is the most widely held level and covers military plans, intelligence summaries, diplomatic communications, and similar information. Like Confidential, it requires a Tier 3 investigation.⁴

Financial stability is a primary focus. Investigators look at credit reports, tax compliance, and outstanding debts, because significant unresolved financial problems can suggest vulnerability to coercion or bribery. They also examine foreign contacts and any influences that might compromise judgment. The investigative scope covers several years of history.

The traditional reinvestigation cycle was every 10 years.⁷ Continuous vetting has largely replaced that model.

Top Secret

Top Secret covers the most sensitive information the government holds. Earning it requires a Tier 5 investigation, formerly called a Single Scope Background Investigation (SSBI), which goes well beyond record checks.⁴

Investigators conduct in-person field interviews with neighbors, former employers, coworkers, and personal references to verify character, lifestyle, and associations. They examine foreign travel, financial holdings, real estate, and potential conflicts of interest. The traditional reinvestigation cycle was every five years, the shortest of any level.⁷

Some agencies require a polygraph, either as part of Top Secret vetting or for access to specific programs. A counterintelligence (CI) polygraph focuses narrowly on espionage, sabotage, and unauthorized disclosure. A full-scope polygraph adds questions about personal conduct such as serious crimes, illegal drug use, and falsification of security forms. Intelligence community agencies are the heaviest users; polygraphs are not universal across every Top Secret job.

Criminal penalties are severe. Under federal law, knowingly sharing classified information with unauthorized persons can carry up to 10 years in prison.⁸ Administrative consequences from revocation through discharge can accompany or substitute for prosecution.

SCI and Special Access Programs Are Not Separate Levels

Sensitive Compartmented Information (SCI) and Special Access Programs (SAP) sometimes get counted as extra clearance levels. They are not. They are additional access designations layered on top of an existing clearance, usually Top Secret, for people who need specific intelligence sources, methods, or technical programs. “TS/SCI” is shorthand for a Top Secret clearance plus SCI access approval.

SCI eligibility requires U.S. citizenship, a favorably adjudicated investigation meeting the standards of Security Executive Agent Directive 4 (SEAD-4), and continuous personnel security evaluation.⁹ SAP access similarly demands a current clearance at the appropriate level, a demonstrated need to know, and often enhanced vetting on financial issues, foreign contacts, and employment conduct. Access is compartmented: holding SCI access for one program does not grant access to another.

Public Trust Is a Different Track

Not every sensitive government job involves classified information. Public Trust positions cover roles handling financial systems, medical records, law enforcement databases, or other sensitive-but-unclassified data. These are technically suitability determinations rather than security clearances.

Moderate Risk Public Trust jobs require a Tier 2 investigation. High Risk jobs require a Tier 4, which can include field interviews similar to those in a Tier 5. Both tiers use the SF-85P form rather than the SF-86 used for national security clearances.¹⁰ A Public Trust designation is a prerequisite for many civil service jobs, particularly at the IRS, Social Security Administration, and Department of Health and Human Services.

How You Actually Qualify

You cannot apply for a clearance on your own. A government agency or a contractor with a facility clearance has to sponsor you for a specific position that requires access to classified information.

The standard form is the SF-86, the Questionnaire for National Security Positions.¹¹¹²¹³

Every decision is evaluated against 13 adjudicative guidelines set by SEAD-4, covering areas like foreign influence, financial considerations, drug involvement, criminal conduct, and personal conduct.¹⁴ Adjudicators use a whole-person analysis, so no single factor automatically disqualifies you. In practice, though, financial problems are the most common reason for denial. Unresolved debts, tax delinquencies, and unexplained spending patterns suggest vulnerability to coercion. The concern is not a missed credit card payment; it is a pattern with no plan to fix it.

Drug involvement is the second most common disqualifier. Because clearance adjudications follow federal law, marijuana use counts as a controlled substance violation regardless of state legality. Failing to disclose past use on the SF-86 stacks a personal conduct issue on top of the drug issue, and that combination is where most denials in this area actually happen.

Dual citizenship is not automatic grounds for denial. Passive dual citizenship acquired by birth, with no active exercise of foreign benefits or voting rights, generally presents low risk. Active use of a foreign passport or participation in a foreign political process requires more explanation and mitigation.

How Long It Takes

Clearance investigations run in months. As of the first quarter of fiscal year 2026, DCSA reported that the fastest 90 percent of Secret investigations completed within 156 days and Top Secret within 227 days. Those numbers cover the investigation phase only, not the full time from job offer to final adjudication.

Extensive foreign travel, contacts with foreign nationals, residence in multiple countries, and complicated financial histories all generate additional leads that take time to run down. Cases with complex foreign connections can stretch past 12 months. The government’s own fiscal year 2026 Trusted Workforce 2.0 progress report rated the “get people to work faster” goal as poor, even as DCSA’s investigation backlog was starting to shrink.¹⁵

Continuous Vetting Has Replaced the Old Reinvestigation Cycles

The 5-, 10-, and 15-year reinvestigation cycles are on their way out. Under Trusted Workforce 2.0, continuous vetting runs automated checks against criminal, terrorism, financial, and public records databases and flags concerns in near real-time.¹⁶

When an alert comes in, investigators assess whether it warrants further action. That may mean working with the individual to resolve the issue or, in more serious cases, suspending or revoking eligibility. A DUI, a sudden large debt, or a new foreign contact no longer waits years to surface. Requests for legacy periodic reinvestigations have dropped by 99 percent. The national security population is enrolled in continuous vetting, and the non-sensitive public trust workforce is being enrolled through fiscal year 2026, with full enrollment of all vetted federal populations targeted for September 2028.¹⁵

Interim Clearances and Reciprocity

Because full investigations take months, agencies can grant an interim clearance to let someone start work while the investigation continues. Interim status follows a successful review of the SF-86 and fingerprint checks and requires no immediately disqualifying information. It is discretionary.

Access is limited. Interim Secret does not grant access to communications security (COMSEC) material, Restricted Data, or NATO-classified information. Interim Top Secret provides access to most Top Secret material but caps COMSEC, NATO, and Restricted Data access at the Secret and Confidential levels. Neither interim status grants SCI or SAP access. If the ongoing investigation turns up derogatory information, the interim clearance can be withdrawn the same day.

Once you hold a full clearance, federal policy generally requires agencies to honor clearances granted by other agencies. Reciprocity can break in a few common situations:⁵

The underlying investigation is older than 7 years for Top Secret, 10 years for Secret, or 15 years for Confidential.
The existing clearance was granted on an interim or exception basis.
The new position requires a higher level or additional access (such as SAP or a polygraph) you haven’t previously met.

Verify reciprocity with the gaining agency’s security office before accepting a position. Failed reciprocity is one of the most common sources of hiring delay in the cleared workforce.

If a Clearance Is Denied or Revoked

There is no constitutional right to a security clearance, and judicial review of clearance decisions is extremely limited under the Supreme Court’s 1988 Department of the Navy v. Egan decision. Executive Order 12968 does provide administrative due process: a written Statement of Reasons, the chance to review the investigative materials, the right to respond in writing, and the right to counsel at your own expense.¹

For defense contractor employees and many DOD civilians, appeals run through DCSA and the Defense Office of Hearings and Appeals (DOHA). After a Statement of Reasons, you can respond in writing, request a personal appearance with DCSA adjudicators, or elect a hearing before a DOHA administrative judge. The judge’s recommendation goes to a Personnel Security Appeals Board, which makes the final call.¹⁷ DOHA decisions are published, which makes them a useful resource for understanding what kinds of issues can be mitigated.

The single best thing you can do throughout the process is be completely honest on the SF-86 and in interviews. Adjudicators can work with past mistakes. They cannot work with discovering that you lied about them.

1
GovInfo. Executive Order 12968 – Access to Classified Information
2
DoD Inspector General. DoD Manual 5200.01, Volume 3
3
The White House Archives. Executive Order 13526 – Classified National Security Information
4
National Institutes of Health. Understanding U.S. Government Background Investigations and Reinvestigations
5
Office of the Director of National Intelligence. Reciprocity Examples
6
General Services Administration. Security Containers
7
U.S. Department of War. All DOD Personnel Now Receive Continuous Security Vetting
8
Office of the Law Revision Counsel. 18 U.S. Code 798 – Disclosure of Classified Information
9
Office of the Director of National Intelligence. ICD 704 – Personnel Security Standards and Procedures for Access to SCI
10
Center for Development of Security Excellence. Federal Investigative Standards Short
11
U.S. Office of Personnel Management. Questionnaire for National Security Positions – SF-86
12
Defense Counterintelligence and Security Agency. National Background Investigation Services
13
Defense Counterintelligence and Security Agency. Electronic Questionnaires for Investigations Processing – e-QIP
14
Office of the Director of National Intelligence. Security Executive Agent Directive 4 – National Security Adjudicative Guidelines
15
Performance.gov. Quarterly Progress Report – FY2026 Q1 Personnel Vetting
16
Defense Counterintelligence and Security Agency. Continuous Vetting
17
Defense Counterintelligence and Security Agency. Appeal an Investigation Decision