How Long Do Security Clearances Last

The answer depends on what you mean by “last.” A security clearance can have a reported time period, a reinvestigation schedule, and an active or inactive status. Those are related, but they aren't the same thing.

That difference matters most after you leave a government job, military role, or contractor position. You may still have clearance eligibility, while no organization is actively using your clearance. Or your clearance may be described as inactive even though the time listed for that clearance level has not fully passed.

The available information also gives conflicting timelines. So there isn't one number that safely answers how long do security clearances last for everyone.

What “how long a security clearance lasts” can mean

People often use “clearance” to mean several different things:

• Eligibility: A government decision that you may access certain classified information.
• Investigation: The background review used to make or support that decision.
• Active status: A clearance being used for a current role that requires it.
• Reinvestigation: A later review of your background.
• Inactive status: A situation where your clearance is no longer being used in an active job.

These terms can overlap, but one doesn't automatically answer all the others.

For example, a person might ask, “Does my security clearance expire?” They could mean:

1. Has the person’s eligibility ended?
2. Has the investigation reached the end of its reported cycle?
3. Is the clearance still active with an employer?
4. Can the person move into another cleared role without starting over?

The research available for this topic does not support treating those questions as one simple expiration date.

It also reports that Department of Defense guidance clarified that eligibility does not expire even if the investigation technically does. That statement points to a key distinction: an investigation can reach the end of a listed period without automatically meaning the person no longer has eligibility.

That does not mean every person remains cleared forever. It means the word “expired” may be describing the investigation, the clearance’s active status, or another part of the process—not necessarily the underlying eligibility.

Reported timeframes for Confidential, Secret, and Top Secret clearances

The search results give one set of reported timeframes by clearance level:

Under that set of numbers:

• A Confidential clearance is reported as lasting 15 years.
• A Secret clearance is reported as lasting 10 years.
• A Top Secret clearance is reported as lasting 5 years.

But another result says all clearance levels must be reinvestigated every five years. That would mean Confidential, Secret, and Top Secret all share a five-year reinvestigation cycle, even though another result gives each level a different duration.

Those statements should not be blended into one universal rule. They describe different timelines, or at least use the word “last” in different ways.

How long does a Secret clearance last?

The reported answer depends on which timeline you mean.

One result lists a Secret clearance at 10 years. Another says clearances at every level must be reinvestigated every five years. A separate result about leaving military service says a Secret clearance can remain good for 10 years after ETS, as long as it has not gone inactive.

So “a Secret clearance lasts 10 years” may be a useful reported figure in one context. It does not prove that every Secret clearance stays active for 10 years, or that no five-year review applies.

How long does a Top Secret clearance last?

One result lists a Top Secret clearance at five years. The separate result saying all clearance levels must be reinvestigated every five years gives the same five-year figure for Top Secret, but it may be referring to the review cycle rather than the full life of the person’s eligibility.

That distinction is easy to miss. A five-year reinvestigation period is not automatically the same as a rule saying eligibility ends on the fifth anniversary.

How long does a Confidential clearance last?

The reported figure for Confidential is 15 years. However, another result says every clearance level must be reinvestigated every five years.

Because the supplied information does not explain how these two figures fit together, treat them as reported timelines rather than a single confirmed rule. The clearance level alone does not tell you whether your status is currently active.

Clearance duration versus reinvestigation timing

A clearance duration answers one kind of question:

> How long is this clearance level reported to remain valid?

A reinvestigation schedule answers another:

> When must the government review the person again?

Those dates may be connected, but they are not interchangeable.

Think of it this way: one reported chart gives different periods for Confidential, Secret, and Top Secret. Another says all levels are reviewed every five years. The first may be describing a broader duration. The second may be describing when a new background review is required.

The supplied research does not identify one controlling explanation for the difference. It does show why quoting only one number can mislead someone who is trying to return to cleared work.

The time needed to get or review a clearance is also separate. A State Department FAQ reports that a security clearance decision takes about 120 days on average. That is a processing estimate for a decision. It is not the same as saying the clearance lasts 120 days, five years, 10 years, or 15 years.

So keep these ideas apart:

• Duration: How long a clearance or eligibility period is reported to cover.
• Reinvestigation: When another background review is due.
• Processing time: How long a decision may take.
• Active status: Whether a current organization is using the clearance.

This is also why the question “how long does security clearance take?” needs more detail. The reported 120-day average concerns a clearance decision. It does not tell you how long a reinvestigation will take, and it does not set the clearance’s period of validity.

What happens after leaving a job or leaving the military

Leaving a job does not have one clearly stated result in the supplied research. The reported outcome depends on whether the clearance remains active or becomes inactive.

A result focused on leaving military service says a Secret clearance can be good for 10 years after ETS if it has not gone inactive. ETS generally refers to the end of a military service term. The same result says that once the clearance has been inactive for two years, any remaining time on it no longer matters.

That creates two separate points:

1. The reported 10-year period does not operate by itself.
2. Inactive status can become more important than the amount of time left on the stated period.

For example, suppose someone leaves the military with a Secret clearance that is reported as having a 10-year period. If the clearance remains active under the applicable process, that 10-year figure may still matter. If it becomes inactive and stays that way for two years, the reported guidance says the remaining time no longer matters.

The supplied material does not explain every step that causes a clearance to remain active or become inactive. It also does not give one universal rule for every military, government, or contractor situation.

That means former employees should avoid relying on a statement like, “My clearance is still within 10 years, so it must be active.” The timeline alone may not answer that.

Active, current, inactive, and expired: the terms to distinguish

These words are often treated as synonyms, but they can point to different facts.

Active

An active clearance is generally being used for a current position that requires access. The available research focuses on the difference between active status and eligibility, but it does not provide a complete definition or a universal status rule.

Current

“Current” can be used informally to mean that a person has a recent clearance or can still be considered for cleared work. It should not automatically be read as proof that the clearance is active with a current employer.

Inactive

A clearance may become inactive after a person leaves the role that required it. The supplied results specifically say that after two years of inactivity, the remaining time on the clearance no longer matters.

That is different from saying the person immediately loses all eligibility. The research also reports that eligibility may not expire even when an investigation technically does.

Expired

“Expired” is the least clear term in the available material. It might refer to:

• The end of a reported investigation period.
• A clearance no longer being active.
• A period of inactivity.
• A loss of eligibility.
• A clearance process that needs to be reviewed again.

The answer to “does your security clearance expire?” is therefore not a clean yes or no based on the supplied information. Some timelines describe reinvestigation or duration. Another result says eligibility does not expire just because the investigation technically reaches its end.

How to check whether a clearance is still active

The research provided does not give a definitive public status-check process. It does, however, make clear that a general timeline cannot prove your current status.

To verify your own situation, use the appropriate security-clearance channel connected to your current or former role. A general clearance office or security contact for the organization involved may be the right place to ask, but the correct channel can depend on the employer, agency, military status, and clearance history.

Have the basic details ready, such as:

• Your former or current organization.
• The role that required the clearance.
• Your clearance level, if you know it.
• When you left the position.
• Whether you have held another cleared role since then.

Ask specifically whether you have:

• Current eligibility.
• An active clearance.
• An inactive clearance.
• A pending reinvestigation or other review.

Those questions are more useful than asking only, “Has my clearance expired?” They force the answer to separate eligibility from active use.

Why the reported timelines conflict

The conflicting numbers appear because the search results are discussing different parts of the clearance process as if they were one thing.

One result gives level-based periods:

• Confidential: 15 years
• Secret: 10 years
• Top Secret: 5 years

Another gives a five-year reinvestigation cycle for every level. A third focuses on a Secret clearance after ETS and says the 10-year period depends on the clearance not becoming inactive. Another says eligibility does not expire even when the investigation technically does.

These statements may be addressing different administrative concepts. The supplied research does not provide enough detail to say exactly how each timeline should be applied, or which one controls every person’s case.

The safest reading is:

• Don't treat a reinvestigation date as the same thing as an expiration date.
• Don't treat eligibility as proof of active status.
• Don't treat time since leaving a job as the only factor.
• Don't assume a clearance remains usable just because a reported duration has not ended.
• Don't assume a technically expired investigation automatically means eligibility is gone.

That is why a comparison table is more useful than one headline number. It shows the reported differences instead of hiding them.

What the research says—and does not say—about Top Secret disqualifiers

The supplied material does not identify specific factors that disqualify someone from a Top Secret clearance.

So it would be misleading to provide a list of Top Secret disqualifiers here. The research only supports discussing the reported five-year Top Secret timeline, the five-year reinvestigation statement for all levels, and the difference between eligibility, investigation timing, and active status.

It also does not support assuming that a person’s clearance level alone answers whether they can receive another clearance after leaving a job. A person’s individual record and the relevant review process would matter, but the supplied information does not explain those standards in enough detail.

If you're trying to learn how long your security clearance is good for after leaving a job, start with your exact status—not a general number from a chart. Ask the appropriate security-clearance channel to confirm whether your eligibility remains, whether the clearance is active or inactive, and what timeline applies to your case.