The US security clearance ladder, explained plainly

If you work in GovCon or you're trying to, the clearance ladder is table stakes — but most explanations are written either for lawyers or for recruiters filling a form. Here's the practical version, with the distinctions that actually matter at hiring time.

The three real classification levels

There are three classification levels in the US national security system. Everything else layers on top.

• Confidential. Unauthorized disclosure would cause damage to national security. Entry-level investigation (NACLC — a background check plus credit check), renewed every 15 years.
• Secret. Unauthorized disclosure would cause serious damage. NACLC plus credit investigation, renewed every 10 years. The most common clearance in the defense workforce.
• Top Secret (TS). Unauthorized disclosure would cause exceptionally grave damage. Full Single Scope Background Investigation (SSBI) that reaches back years, renewed every 5.

The cost scales with depth: around $433 to process a Secret, $5,596 for a Top Secret (2020 figures, via the Wikipedia article on US security clearance). TS investigations routinely take 6 to 18 months.

TS/SCI is not a higher level than TS

This is the single most common misconception in GovCon job ads.

Sensitive Compartmented Information (SCI) is not a classification above Top Secret. It's an access program on top of TS for highly restricted intelligence data, granted only after TS eligibility is established and only into specific compartments. Someone cleared into compartment A doesn't automatically get compartment B — they have to be read in.

So "TS/SCI" means: you hold TS and you've been indoctrinated into one or more SCI compartments. It's an access state, not a classification level.

The same is true for polygraph modifiers:

• TS/SCI + CI Poly. Counterintelligence polygraph — narrow, focused on espionage, unauthorized disclosure, and foreign contacts.
• TS/SCI + Full Scope Poly. Adds "lifestyle" questions on top of CI. The most intrusive standard exam; common at certain intel agencies.

The ladder at hiring time

For the matching side — which is what ClearMatch does — what matters is the numeric ladder. Higher tiers subsume lower ones, so a candidate with a higher clearance can always do work that requires a lower one.

This is the exact model our matcher uses. If you hold Secret and a job requires Confidential, you meet the bar. If you hold TS/SCI and a job requires Secret, you meet the bar. If you hold Secret and the job wants TS/SCI, you're below — we still surface the job, but ranked after jobs where you actually qualify, with a ✗ TS/SCI pill so the gap is visible.

Clearance ≠ access

Even inside your clearance level, there's a second gate recruiters often forget: need to know. Holding a TS doesn't automatically grant you access to every TS document — a disclosure officer still has to decide you have a legitimate need. For SCI, that decision is per-compartment.

There's also a distinction between eligibility and active clearance. If your last investigation was more than 24 months ago and you haven't been in a cleared job since, you're probably eligible to be cleared again quickly, but you don't currently hold active access. On ClearMatch profiles, we treat the highest level you held as your current tier — but contractors will always verify this at offer time via JPAS / DISS.

The nuclear side-ladder (Q and L)

If you see Q clearance or L clearance in a JD, those are Department of Energy specific, for work under the Atomic Energy Act:

• L clearance is roughly DOE's Secret equivalent (NACLC investigation).
• Q clearance is roughly DOE's Top Secret equivalent (SSBI investigation).

Reciprocity between DOE and DoD / IC clearances exists but has carve-outs — don't assume a transfer is automatic. Executive Order 12968 aligned the processes but certain agency heads can impose additional Special Access Program requirements.

Public Trust is not a clearance

Also common: Public Trust designations (Tier 1, 2, 4, 5 positions) are suitability determinations for non-national-security federal work. They involve a background check, but they are not security clearances and don't grant access to classified information. If a job lists "Public Trust" as the bar, a cleared candidate does not get any hiring boost just from holding Secret or TS — the two tracks are separate.

Things that don't automatically disqualify

A few myths worth clearing up:

• Bankruptcy. Not automatic. Adjudicators use the "whole person" standard — pattern, cause, and current financial stability all matter.
• Dual citizenship. Holding dual citizenship isn't disqualifying on its own. Exercising foreign citizenship (using a foreign passport, voting abroad, military service) can be.
• Foreign family contacts. Contextual — contacts with immediate family in an adversarial country raise flags; contacts with extended family in an allied country usually don't.
• Old offenses. Passage of time plus evidence of stability is a mitigating factor explicitly called out in adjudicative guidelines.

What this means for your ClearMatch profile

Three concrete takeaways for a cleared candidate filling out their profile:

1. Pick the highest tier you've actually held — if you were TS/SCI in 2021 and currently inactive, that's still TS/SCI for matching purposes. Contractors verify active status at hire.
2. List your polygraph status honestly. CI Poly and Full Scope Poly dramatically widen the job set, especially for IC-supporting roles. Claiming them when you don't hold them burns credibility the first time a recruiter checks.
3. List agencies and programs, not just clearance. Agency experience (DoD, DHS, IC, VA) is a first-class field in our matcher — someone who supported NSA missions outcompetes a generic TS/SCI holder for NSA-adjacent roles.

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Source: US security clearance (Wikipedia). Specific procedures and timelines vary by agency — always verify with your FSO or the hiring contractor's security team at offer time.