What the three federal clearance levels actually mean

Federal security clearances exist on three tiers defined by Executive Order 13526: Confidential, Secret, and Top Secret. Each tier corresponds to the level of damage an unauthorized disclosure could inflict on national security. Confidential covers information whose unauthorized disclosure could cause damage to national security; Secret covers information that could cause serious damage; Top Secret covers information that could cause exceptionally grave damage. Above Top Secret sits Sensitive Compartmented Information (SCI) and Special Access Programs (SAPs), which are not separate clearance levels but additional read-ins layered on top of a Top Secret eligibility.

The pipeline that grants these clearances is run primarily by the Defense Counterintelligence and Security Agency (DCSA), which absorbed the Office of Personnel Management’s National Background Investigations Bureau (NBIB) function in October 2019. DCSA conducts the background investigation; the adjudicating agency — the Department of Defense, the Office of the Director of National Intelligence, or a civilian department such as the Department of Energy — makes the final eligibility determination using the 13 adjudicative guidelines codified in Security Executive Agent Directive 4 (SEAD-4, June 2017). DoD adjudication procedure is codified in DoD Manual 5200.02; contractor facility clearances run under 32 CFR Part 117 (NISPOM, effective August 2021).

The clearance ladder at a glance: investigation, scope, and renewal

The federal government replaced the older NACI / NACLC / SSBI investigation labels with three-tier nomenclature in 2017 under the Federal Investigative Standards issued jointly by ODNI and OPM. Tier 1 covers low-risk public trust positions and is not a national security clearance. Tier 3 supports Confidential and Secret eligibility. Tier 5 supports Top Secret eligibility and any SCI or SAP read-ins. Continuous Vetting, rolled out across the cleared population starting in 2018 and consolidated under the Trusted Workforce 2.0 program that DCSA built out between 2021 and 2024, has effectively replaced the old five- and ten-year periodic reinvestigation cadence for most personnel. The underlying tier definitions still drive the depth of the initial check.

Confidential: the entry tier that few civilians ever see in isolation

Confidential is the lowest of the three classified tiers and the rarest to hold on its own. Most defense contractor and federal civilian positions that need access to classified material start at Secret, so the Confidential population skews toward military service members in roles touching low-sensitivity classified information. The Tier 3 investigation that underpins Confidential covers seven years of residence, employment, education, and references, plus a credit check and a criminal records check, per the Federal Investigative Standards that DCSA administers.

If you hold a Confidential clearance alone, the labor market pricing it commands is modest. Per the ClearanceJobs 2024 Compensation Report, Confidential-only holders earned a documented median premium of roughly $7,500 to $13,000 over an uncleared baseline, and the premium largely vanishes once you step outside of a federal or contractor employer. The practical play is to use a Confidential hold as a stepping stone to Secret or Top Secret rather than a destination.

Secret: the workhorse clearance of the defense industrial base

Secret is the most common classified clearance in the federal workforce. Per the ODNI FY2023 Annual Report on Security Clearance Determinations — the most recent public release as of 2026 — the total cleared population (eligible-in-access plus eligible-without-access) sat at approximately 4.0 million, with roughly 2.6 million eligibilities at Secret or Confidential and roughly 1.3 million at Top Secret. The Tier 3 investigation under Secret is the same documentary scope as Confidential, but the adjudication standard is more demanding and the legacy cycle — prior to Continuous Vetting — was ten years rather than fifteen.

Pay data confirms the picture. Per the ClearanceJobs 2024 Compensation Report, Secret-cleared respondents earned a documented median premium of $11,500 to $19,800 over an uncleared baseline in the 2024 dataset. For a mid-career software engineer pulling $135,000 in commercial industry, a transition into a Secret-required defense contractor position pencils to roughly $147,000 to $155,000, with the bulk of the lift coming from contract billing rates rather than a generous base. The federal civilian-side overlay matters too: a GS-12 Step 5 in the DC locality lands at $116,071 per OPM’s 2026 General Schedule pay tables, and most Secret-required GS billets cluster at the GS-12 / GS-13 grades.

Top Secret and TS/SCI: where the labor market gets expensive

Top Secret eligibility is granted after a Tier 5 background investigation under the Federal Investigative Standards — a roughly ten-year scope covering residence, employment, references, finance, and foreign contacts, conducted by trained DCSA investigators per DoDM 5200.02 procedures. Investigators interview subjects, neighbors, supervisors, and former co-workers in person, then submit the case file to the adjudicating authority for determination. Most Top Secret positions also require enrollment in DCSA’s Continuous Vetting program under Trusted Workforce 2.0, which automates record checks against seven data categories — criminal, terrorism, financial, foreign travel, public records, suitability and credential, and credit — on a near-real-time basis.

Top Secret-only holders earned a documented premium of $22,000 to $38,000 over uncleared baselines in the ClearanceJobs 2024 Compensation Report. Layering Sensitive Compartmented Information access on top of a Top Secret — Top Secret / Sensitive Compartmented Information, abbreviated TS/SCI hereafter — elevates the package substantially. ZipRecruiter’s TS/SCI cleared salary aggregation and the cleared compensation data published across ClearanceJobs’s editorial coverage both put the 2024 TS/SCI average in the Washington DC metro at $149,398, and that figure climbs again when a counterintelligence or full-scope polygraph is required for sensitive National Security Agency (NSA), Central Intelligence Agency (CIA), or National Reconnaissance Office (NRO) positions.

How long does a clearance investigation actually take in 2026?

Clearance investigation timeliness is the most-asked single question in cleared hiring — and the answer changed materially under Trusted Workforce 2.0. DCSA publishes quarterly personnel-vetting timeliness data through its “DCSA by the Numbers” performance trends. The FY2024 trend places the fastest-90th-percentile Tier 5 initial investigation around 90 to 130 days end-to-end for routine cases. Tier 3 initial investigations land in the 50-to-80-day band on the same trend line. Cases with foreign contacts, complex financial history, or extended residence abroad can stretch substantially longer; cases flagged for adjudicative review under SEAD-4 add weeks to months depending on guideline.

Sean Bigley, who publishes a regular clearance-law column at ClearanceJobs and runs a security-clearance practice as a partner at Bigley Ranish LLP, has been blunt about what changed under Continuous Vetting: every dropped credit score, every arrest, every foreign travel notification is a near-real-time signal back to the adjudicating agency, not a once-every-five-years review at reinvestigation. For cleared employees, the practical effect is that clearance maintenance has shifted from a periodic exercise to a permanent compliance posture. The flip side is that the periodic reinvestigation, once the dominant time sink in the cleared lifecycle, is now largely absent from the calendar for most personnel.

The investigation-timeliness conversation also turns on which system the case routes through. Modern Tier 3 and Tier 5 cases run through DCSA’s National Background Investigation Services (NBIS) platform, which has been phasing in across the cleared population since 2022 to replace the legacy e-QIP / eApp system. The questionnaire itself remains OPM’s Standard Form 86, the canonical instrument that every cleared candidate fills out at investigation initiation and at reinvestigation.

What the 13 adjudicative guidelines actually mean for clearance denials

The eligibility determination that follows a DCSA investigation runs against the 13 adjudicative guidelines codified in Security Executive Agent Directive 4 (SEAD-4, June 2017). Each guideline lists disqualifying conditions and mitigating conditions; adjudicators weigh the case file against both columns and produce a whole-person determination, not a checklist score. The same guideline framework applies across civilian, military, and contractor adjudications, even though the adjudicating authority differs.

“The financial considerations guideline drives the largest single bucket of clearance denials,” is how clearance attorney Mark Zaid has framed the pattern across years of Federal News Network interviews and his public clearance-law practice. The pattern is consistent in the published Defense Office of Hearings and Appeals (DOHA) decisions: unresolved debt, repeated tax-filing failures, and pattern-of-spending issues clear more denials than any other single guideline, year over year. Foreign influence sits second, particularly for candidates with close family ties to adversary nations or substantial foreign business interests, both of which became more scrutinized through the 2020s.

Civilian, military, and contractor adjudication differ in important ways

The clearance level you hold does not change between an Army intelligence analyst, a Department of State foreign service officer, and a Lockheed Martin program engineer. The investigation tier does not change either. What changes is the adjudicating authority and the secondary security forms each side has to maintain.

Civilian federal employees are adjudicated by their hiring department or its Central Adjudication Facility, per DoDM 5200.02 procedures for DoD-adjacent personnel and equivalents for other departments. Military service members are adjudicated by the DoD Consolidated Adjudication Services (CAS), the same office that handles DoD civilian and contractor adjudications under the National Industrial Security Program. Industry contractors operate under the Facility Clearance program codified at 32 CFR Part 117 (the NISPOM Rule, effective August 2021) — the contractor company itself holds a facility clearance and sponsors individual personnel clearances against that facility.

Polygraph requirements: counterintelligence scope versus full scope

Polygraphs are not part of the standard clearance package. They are an additional access requirement layered on by specific agencies. Counterintelligence (CI) scope polygraphs test on a narrow set of espionage and unauthorized-disclosure questions and are common at the NSA, the National Geospatial-Intelligence Agency (NGA), and selected contractor billets supporting those agencies. Full-scope polygraphs add lifestyle and personal-conduct questions and are mandatory for most CIA staff and contractor positions plus selected NSA and NRO billets.

The labor market prices polygraphs aggressively. A counterintelligence-scope polygraph layered on a TS/SCI baseline added a documented $10,500 to $19,800 in median premium per the ClearanceJobs 2024 Compensation Report, with full-scope polygraph billets running another $10,000 to $20,000 above CI. The trade-off is portability: not every TS/SCI program will accept your existing poly without re-administering one, and lapses or failures stay attached to your clearance record under Continuous Vetting.

Where international equivalents fit: NATO, Five Eyes, and beyond

Multinational programs require classified information to flow across allied countries. NATO operates its own three-tier scheme (NATO Confidential, NATO Secret, Cosmic Top Secret) that mirrors the US construct. The Five Eyes intelligence alliance (United States, United Kingdom, Canada, Australia, New Zealand) maintains bilateral reciprocity agreements so that a UK Developed Vetting status, an Australian Negative Vetting 2, or a Canadian Top Secret can be recognized for access to specific shared programs.

The mechanics of reciprocity vary by program. A US Top Secret holder cannot simply walk into a UK SCI compartment; the relevant accrediting authorities have to sign off, and additional briefings are usually required. For job seekers, the practical reality is that international clearance equivalents matter most for personnel rotating through embassy assignments, NATO commands, or specific multilateral programs such as the Combined Communications-Electronics Board.

How the cleared labor market priced clearance in 2024–2026

The cleared labor market in 2026 remains structurally tight. The total cleared population sits near 4.0 million per ODNI’s FY2023 statistical reporting. Inside that pool, contractor clearance grants have continued to outpace federal civilian grants by a wide margin, and DCSA investigation backlogs — while down from the 2018 peak — still measure in months for full Tier 5 packages. Hiring managers know this. They price portable, current clearances at a premium because the alternative is sponsoring a new investigation and parking a billet for ninety to one hundred and thirty days at the optimistic end, longer at the realistic end.

Lindy Kyzer, who runs editorial at ClearanceJobs and tracks the cleared labor market continuously, has framed the 2024–2026 dynamic as a credential-supply constraint, not a demand softening. The pipeline to produce a new Top Secret-eligible candidate runs years, contractor headcount on cleared federal programs has held flat-to-up through the post-2023 contracting reset, and the result is a price floor on portable cleared talent that does not respond to general-economy hiring cycles the way commercial cyber compensation does. The structural tightness is the reason the premium bands in the table above have widened, not compressed, since 2022.

For uncleared candidates targeting a first cleared role, the typical entry path runs through a Secret-required position at a defense contractor or a federal civilian role with a sponsored Tier 3 investigation. For cleared candidates looking to step up, the binary question is whether your current Secret will support a transition into a Top Secret or TS/SCI-required program, or whether you need an upgrade investigation first. Recruiters at firms such as Booz Allen Hamilton, Leidos, and SAIC will walk you through the math early in the cycle if you ask — the alternative for them is a six-to-twelve-month sponsored investigation against a contract clock they cannot afford to slip.

What clearance economics look like through 2027

Two trends shape clearance economics through 2027. The first is DCSA timeliness under Trusted Workforce 2.0: if the fastest-90th-percentile Tier 5 number stays anchored in the 90-to-130-day band documented in DCSA’s FY2024 performance trends, the cost of investigation delay drops, and hiring managers will eventually price the clearance premium closer to the steady-state cost of carrying a billet for one-to-two quarters rather than the legacy four-to-eight-quarter wait. The second is contractor headcount: ODNI’s annual reports have shown contractor cleared headcount rising every year through FY2023, and the trajectory is not reversing inside the current contracting environment.

If DCSA holds the 90-to-130-day Tier 5 line through 2027 and contractor headcount continues to grow, the clearance premium compresses on the new-investigation end (where the cost of waiting drops) and expands on the portable-clearance end (where the supply of already-cleared candidates remains the binding constraint). Watch DCSA’s quarterly timeliness reports and the annual ClearanceJobs Compensation Report. If timeliness slips back toward 200 days at the 90th percentile, the premium widens again and the math ages well. If timeliness drops below 90 days, the new-investigation discount narrows and the portable-clearance premium becomes a larger share of the total.

Common questions about clearance level differences

Where to look next on this site

• Cleared Jobs Near Fort Meade Maryland — the densest TS/SCI labor market outside the Beltway
• Cleared Jobs Near Pentagon Arlington Virginia — DoD civilian and contractor billets in the National Capital Region
• Cleared Jobs Near Joint Base Anacostia-Bolling DC — intel community billets concentrated south of the river
• Cleared Jobs Near Fort Belvoir Virginia — INSCOM and DCSA headquarters footprint
• Cleared Jobs Near Fort Liberty North Carolina — special operations clearance pipeline
• 0689 Cyber Security Technician Marine Corps to Civilian Career Guide — clearance use for cyber MOS transitions
• 18F Special Forces Intelligence Sergeant to Civilian Career Guide — TS/SCI-grade intel experience to civilian roles
• 2651 Special Intelligence System Administrator to Civilian Career Guide — SCI-cleared sysadmin civilian crossover