What Is a NACI Background Check for Federal Jobs?

A NACI background check is the baseline investigation the federal government runs on civilian employees and contractors before they start work in low-risk, non-sensitive positions. It covers a fingerprint-based criminal records check, searches of federal investigative databases, and written inquiries to former employers, schools, and references. Since October 1, 2014, the investigation has been formally reclassified as a Tier 1 (T1) investigation under the 2012 Federal Investigative Standards, but the older “NACI” label still appears on job postings and agency paperwork. The sponsoring agency pays for it, not you.1Defense Counterintelligence and Security Agency. Implementation of Federal Investigative Standards for Tier 1

If a posting or HR office refers to a “NACI” or a “Tier 1,” they mean the same thing. Both are requested using Standard Form 85 and cover the same scope.

What Investigators Actually Check

A Tier 1 investigation pulls from three main sources:

  • A fingerprint-based criminal records check submitted through FBI channels to search federal and state criminal history databases. Fingerprint matching provides positive identification and avoids the false hits common to name-only searches.2Federal Bureau of Investigation. National Fingerprint Based Background Checks Steps for Success
  • Searches of federal investigative databases, including the Security/Suitability Investigations Index (SII) and the Defense Central Index of Investigations (DCII), which catalog prior background investigations and security determinations across the federal workforce.3Defense Counterintelligence and Security Agency. Background Investigations for Security and HR Professionals Terms and Definitions4Defense Counterintelligence and Security Agency. Defense Central Index of Investigations (DCII)
  • Written inquiries mailed to former employers, schools, and references you listed on your application, verifying dates and asking about your character and reliability.

One point people get wrong: a standard NACI/Tier 1 for a low-risk position does not include a credit check. The SF-85 does not ask financial questions. Credit review kicks in at higher risk levels, such as the Tier 2 investigation used for moderate-risk public trust positions. If your role gets designated moderate or high risk, expect your finances to get looked at.5Internal Revenue Service. IRS HSPD-12 PIV I Procedures Manual

Who Has to Get One

A Tier 1 investigation is the minimum required for federal civilian employees in non-sensitive, low-risk positions: administrative support, clerical staff, mail room workers, warehouse personnel, and similar roles.6Defense Counterintelligence and Security Agency. Position Designation Investigation Type Chart

The same investigation applies to contractors and other non-employees who need a Personal Identity Verification (PIV) card for access to federal facilities or systems for more than 30 days under Homeland Security Presidential Directive 12. That sweeps in seasonal employees, volunteers, guest researchers, intermittent workers, and contractor staff performing work for an agency.7OPM: Office of Personnel Management. Credentialing Standards Procedures for Issuing Personal Identity Verification Cards under HSPD-12

Higher-responsibility roles get higher-tier investigations. IT professionals who plan, design, or maintain government systems are typically classified as moderate risk and require Tier 2. Security guards generally fall into the moderate-risk category as well. Positions requiring access to classified information use Tier 3 or higher and different forms entirely.5Internal Revenue Service. IRS HSPD-12 PIV I Procedures Manual

Filling Out the SF-85

The investigation starts after you receive a conditional job offer. Your sponsoring agency initiates the process, and you complete Standard Form 85, the Questionnaire for Non-Sensitive Positions. The form asks for your personal identifying information, citizenship status, five years of residence history, five years of employment and education history, military service, and selective service registration. You also list people who knew you at each address and workplace within the past three years.

The federal government has moved from the older eQIP system to a newer platform called eApp, part of the National Background Investigation Services. Your security office will send instructions and deadlines.

Two things trip people up on the SF-85. Providing your Social Security number is technically voluntary, but declining will delay or prevent processing. And the employment history section specifically asks whether you were fired, quit after being told you would be fired, left by mutual agreement following allegations of misconduct, or received written discipline in the past five years. Answer honestly. Investigators frequently already know the answers from other sources, and a lie is itself grounds for finding you unsuitable, separate from whatever you were trying to hide.

How Long It Takes

Tier 1 is the fastest of the federal investigation tiers, but timelines vary with your history and DCSA’s workload. Most applicants should plan on somewhere from a few weeks to roughly 60 days from submission. Cases involving overseas residency, multiple name changes, or issues that require follow-up take longer.

Agencies can grant interim suitability or credentialing determinations that let you start working while the full investigation is still pending. Whether yours does depends on its policies and the sensitivity of the role. An interim determination is provisional. An unfavorable final result can still lead to separation.

What Can Disqualify You

Federal regulations at 5 CFR 731.202 list nine factors that can make an applicant unsuitable for federal service:

  • Criminal conduct
  • Dishonest conduct
  • Material, intentional false statement, or deception or fraud in the examination or appointment process
  • Misconduct or negligence in prior employment
  • Excessive alcohol use without evidence of rehabilitation, where it would affect job performance or threaten safety
  • Illegal drug use without evidence of rehabilitation
  • Violent conduct
  • Acts designed to overthrow the U.S. Government by force
  • Any statutory or regulatory bar preventing lawful employment in the position

None of these disqualifies you automatically. Adjudicators weigh the seriousness of the conduct, how recently it occurred, how old you were, the circumstances, and evidence of rehabilitation.8eCFR. 5 CFR 731.202 Criteria for Making Suitability and Fitness Determinations

Marijuana

Marijuana is still a Schedule I controlled substance under federal law regardless of state legalization. OPM guidance directs agencies not to find someone unsuitable based solely on past marijuana use; recency, frequency, and circumstances get weighed case by case. Current use is different. Executive Order 12564 requires federal employees to refrain from illegal drug use, and current marijuana users are considered unsuitable.9OPM: Office of Personnel Management. Assessing the Suitability/Fitness of Applicants or Appointees on the Basis of Marijuana Use

Why Lying Is Worse Than the Underlying Issue

Lying on the SF-85 is one of the nine disqualifying factors on its own. An old misdemeanor with evidence of rehabilitation might not sink your application. Hiding that same misdemeanor almost certainly will, because investigators are cross-checking your answers against criminal databases, employment records, and reference interviews, and the discrepancy will surface.8eCFR. 5 CFR 731.202 Criteria for Making Suitability and Fitness Determinations

What Happens After the Investigation

Once DCSA finishes, results go back to your sponsoring agency. Agency adjudicators then make a suitability determination applying the 5 CFR 731.202 factors. A favorable finding lets you continue in the position. An unfavorable one can lead to a rescinded offer or, if you’ve already started, separation. This is a suitability determination, not a security clearance.

In serious cases, OPM can impose a debarment that bars you from competitive service positions and career Senior Executive Service appointments for up to three years from the date of the unfavorable determination. OPM can also add debarment periods if new disqualifying conduct comes up during an existing debarment. OPM has sole discretion over the duration, so three years is the ceiling, not the default.10eCFR. 5 CFR 731.204 Debarment by OPM in Cases Involving the Competitive Service and Career Senior Executive Service

Continuous Vetting

Historically, Tier 1 positions had no periodic reinvestigation. That is changing under the Trusted Workforce 2.0 initiative. DCSA, OPM, and the Performance Accountability Council are phasing in continuous vetting to replace one-time investigations across all tiers, including non-sensitive roles. Agencies are being required to enroll non-sensitive employees into automated, ongoing record checks as the rollout progresses, so a favorable Tier 1 today is no longer the end of the government looking at your record.11OPM: Office of Personnel Management. Continuous Vetting for Non-Sensitive Public Trust Positions

Appealing an Unfavorable Decision

If OPM or your agency finds you unsuitable, you can appeal to the Merit Systems Protection Board. File within 30 days of the effective date of the action or within 30 days of receiving the agency’s decision, whichever is later. If you and the agency mutually agree to try alternative dispute resolution first, the deadline extends to 60 days.12U.S. Merit Systems Protection Board. How to File an Appeal

File with the MSPB regional or field office covering where you live. The Board’s e-Appeal Online system walks you through the required information, and you can also file by mail or fax. Bring the notice of proposed action, the agency’s final decision, and your SF-50 or similar personnel action notice if you have it. You can represent yourself or designate anyone you choose as your representative.

The standard of review is not friendly to appellants. If the Board finds even one of the charges against you is supported by a preponderance of the evidence, it will affirm the determination, even if other charges fail.13eCFR. 5 CFR 731.501 Appeal to the Merit Systems Protection Board

Getting a Copy of Your Investigation File

You can request your completed background investigation file from DCSA under the Privacy Act. Requests go to DCSA’s FOI/Privacy Office for Investigations by mail, email, or fax. You’ll need to provide your full name, date of birth, place of birth, Social Security number, and mailing address, along with a signed declaration under penalty of perjury verifying your identity.14Defense Counterintelligence and Security Agency. Requesting My Records and Access Appeals

If you only need a copy of the SF-85 you submitted, ask your sponsoring agency’s HR or security office first. They can usually retrieve it faster than the DCSA records process. If DCSA withholds portions of your file, you have 90 calendar days from the date of their response to appeal. Beyond administrative appeals, you can seek judicial review in federal district court if the appeal is denied.