To get a TS/SCI security clearance, you need a federal agency or cleared defense contractor to sponsor you for a specific job that requires access to classified national security information. You cannot apply on your own. Once sponsored, you complete Standard Form 86, sit through a Tier 5 background investigation that averages around eight months, possibly take a polygraph, and then wait for adjudicators to decide whether granting you access is consistent with national security.
The investigation alone costs the government $5,890 at standard FY 2026 rates, which is one reason sponsorship only happens when there’s a genuine need for you to see the material.
Start With a Job Offer, Not an Application
There is no form you submit to request a clearance for yourself. The process begins when a government agency or a cleared contractor extends a conditional job offer for a position coded as requiring Top Secret access with SCI eligibility, then formally sponsors you into the system. That sponsorship is what triggers everything else, and the government picks up the full cost of the investigation.
If you are looking at job listings, the phrase to watch for is “TS/SCI required” or “TS/SCI eligible.” Employers who post those roles have the infrastructure to sponsor cleared personnel. Employers who don’t, don’t.
What TS and SCI Mean Together
“Top Secret” and “SCI” are two different things bundled into one label. Top Secret is the highest of three clearance levels, above Confidential and Secret, and covers information whose unauthorized disclosure could cause exceptionally grave damage to national security. Sensitive Compartmented Information is not a higher clearance; it is an additional access designation layered on top of Top Secret. SCI material is organized into compartments identified by code words, and you need separate approval to be “read into” each compartment. In practice, earning Top Secret and getting SCI access are related but distinct approvals.
Who Is Eligible
U.S. citizenship is required. Executive Order 12968 limits eligibility for classified information access to U.S. citizens who have completed an appropriate investigation and whose background demonstrates loyalty, trustworthiness, and sound judgment. Dual citizens are not automatically disqualified, but the foreign citizenship will get close attention during adjudication.
Beyond citizenship, you need a sponsor and a documented “need to know.” Nobody gets a TS/SCI speculatively or to strengthen a resume. The sponsoring entity has to establish that a specific position requires this access.
The SF-86 and What You Have to Disclose
After sponsorship, you get access to the government’s electronic questionnaire system to complete Standard Form 86, the Questionnaire for National Security Positions. The old e-QIP platform has been replaced by eApp under the National Background Investigation Services (NBIS) rollout, but the form itself is unchanged.
Expect an unusual level of detail. You’ll list every residential address and every employer for the past ten years with no gaps allowed. Periods of unemployment and full-time education have to be accounted for. Schools attended in the same ten-year window get listed too.
Financial history gets heavy attention because money problems are the single most common reason clearances are denied. The form asks about delinquent debts, bankruptcies, tax liens, garnishments, and foreign financial interests such as overseas accounts or property. State Department guidance calls adverse credit “one of the biggest problems with applicants.”
Foreign connections draw equally close scrutiny. You have to list non-U.S. citizens with whom you have close personal relationships, along with their citizenship, occupation, and employer. All foreign travel over the past seven years must be documented. Foreign relatives, living in the U.S. or abroad, are listed separately with full identifying details.
The form also covers criminal history (all arrests, not just convictions), illegal drug use, alcohol-related incidents, and mental health treatment. Some questions look back ten years, others ask whether something has “ever” occurred.
The rule that matters most: honesty beats perfection. Investigators expect imperfect backgrounds. What they do not tolerate is an omission or false statement, which is itself a security concern under the adjudicative guidelines and can sink an application that would otherwise have survived the underlying issue.
The Tier 5 Investigation
Once you submit the SF-86, the Defense Counterintelligence and Security Agency (DCSA) opens a Tier 5 (T5) investigation. You may still hear this called a Single Scope Background Investigation (SSBI), which was the pre-2016 name.
Investigators verify every claim on the form. They pull financial and court records, run criminal database checks, and conduct in-person interviews with the references, employers, neighbors, and associates you listed. These interviews are detailed, not casual, and cover your character, reliability, financial habits, and any foreign associations. Give your references a heads-up so they aren’t surprised.
You will also sit for a subject interview with an investigator. Come ready to explain any gaps or discrepancies directly rather than downplay them.
Whether You’ll Take a Polygraph
Whether a polygraph is part of your process depends on the sponsoring agency. Intelligence Community Directive 704 lets IC agency heads require polygraphs when they consider it in the interest of national security. The CIA and NSA routinely do. Many Department of Defense positions don’t.
Two types exist. A counterintelligence (CI) polygraph focuses narrowly on espionage, sabotage, unauthorized disclosure, and contact with foreign intelligence services, and typically runs two to four hours. A full-scope (lifestyle) polygraph covers all of that plus criminal conduct, drug use, financial issues, and misuse of information technology, and can run three to six hours. Your sponsor decides which applies.
Getting an Interim Clearance
Because the full investigation takes months, DCSA considers every applicant submitted by a cleared contractor for interim eligibility at the same time it opens the case. If your background looks clean on the surface, an interim Top Secret can come through quickly and let you start accessing classified material while the full investigation runs.
Interim clearances are not guaranteed. An interim Top Secret typically does not grant SCI access, which usually waits for the completed investigation. And if anything concerning surfaces during the investigation, the interim can be pulled at any point.
How Adjudicators Decide
When the investigation closes, adjudicators at the sponsoring agency review the file and decide whether granting access is consistent with national security. They apply 13 adjudicative guidelines set out in Security Executive Agent Directive 4 (SEAD 4), using the “whole person concept”: the totality of your life, not pass/fail scoring on individual items.
The 13 guidelines are:
- Allegiance to the United States
- Foreign Influence
- Foreign Preference
- Sexual Behavior
- Personal Conduct
- Financial Considerations
- Alcohol Consumption
- Drug Involvement
- Psychological Conditions
- Criminal Conduct
- Handling Protected Information
- Outside Activities
- Use of Information Technology
Financial issues dominate denials by a wide margin. According to Defense Office of Hearings and Appeals (DOHA) case summaries, financial concerns outnumber every other denial reason combined and most are upheld on appeal. Drug involvement, especially marijuana use and the failure to disclose it, is next. Applicants sometimes argue that marijuana use is legal in their state. That argument doesn’t work; federal law controls, and stated intent to continue using is treated as an unmitigated concern.
A single issue rarely disqualifies you on its own. Adjudicators weigh how recent the behavior was, whether it was voluntary, your age and maturity at the time, and what you’ve done since. A five-year-old bankruptcy you’ve recovered from reads very differently from active debt you’re ignoring. Honesty about past problems is itself a mitigating factor. Concealment is an aggravating one.
Timeline and Who Pays
As of the third quarter of fiscal year 2025, the average end-to-end processing time for a DCSA background investigation is 243 days: about 19 days to initiate, 215 days for the investigation, and 9 days for adjudication. That’s roughly eight months in a clean case. Complicated foreign ties, heavy travel histories, or unresolved issues can push it well beyond that.
You pay nothing. The sponsoring agency covers the cost, which at FY 2026 standard rates is $5,890 for a T5.
If You’re Denied
If adjudicators can’t make a favorable determination, you’ll receive a Statement of Reasons (SOR), a formal document listing the specific security concerns that drove the decision. This is a notice of intent to deny, not a final denial. You get a window to respond, typically 10 to 45 days depending on the agency.
The response matters. Strong responses often run 10 to 14 pages with 25 to 40 pages of supporting exhibits, including performance evaluations, character letters, financial records showing remediation, and witness statements. Every agency’s appeal process is slightly different (DoD uses DOHA, DHS uses a written response and personal appearance, most IC agencies allow a written response followed by a meeting with adjudicators), but you get to make your case before the decision becomes final. Getting legal counsel early makes a real difference.
Keeping It Once You Have It
The clearance comes with continuing obligations. Historically, Top Secret required a full reinvestigation every five years. That model is being replaced under Trusted Workforce 2.0 with continuous vetting (CV), in which DCSA runs automated checks against criminal, financial, terrorism, and public records on an ongoing basis. Alerts get reviewed, and adjudicators can suspend or revoke access when warranted.
Security Executive Agent Directive 3 (SEAD 3) also requires you to self-report specific events to your security officer. These include foreign travel (reported at least 30 days before departure when possible), new close relationships with foreign nationals, marriage to or cohabitation with a foreign national, any arrest whether or not charges are filed, significant financial difficulties like bankruptcy or wage garnishment, foreign financial interests, and any intent to publish information related to your official duties. Failing to report a required event is itself a security concern under the personal conduct guideline and can cost you the clearance even when the underlying event would not have.