What triggers a background check — and when does it happen?
Background checks are almost always initiated after a conditional offer of employment — meaning the employer has selected you as their candidate and is making an offer contingent on the results of the check. You should not be asked to submit to a background check before an offer exists (this is best practice and, in some jurisdictions, required by law).
The sequence typically goes: final interview → verbal offer → written offer letter (conditional) → background check consent form → background check runs → results returned → offer confirmed (or, rarely, rescinded).
If you haven't received any kind of offer but are being asked to authorise a background check, that's unusual — ask what stage of the process you're in before signing anything.
Who runs background checks — and what do they actually check?
Most large and mid-size employers use a third-party background check vendor rather than running checks internally. The four most common vendors in the US are:
HireRight — used by many Fortune 500 companies and enterprises. Known for thorough employment verification.
Sterling — widely used across healthcare, financial services, and tech. Often used for roles requiring security clearance.
First Advantage — common in transportation, logistics, and gig economy companies. Often runs MVR (motor vehicle record) checks.
Checkr — popular with tech companies and gig platforms (Uber, Airbnb, and similar). Known for faster turnaround on standard checks.
What a background check covers depends on the role and employer configuration:
- Criminal record check: Federal, state/county, and sometimes international criminal records. This is in virtually every background check.
- Employment verification: Confirming dates of employment, job titles, and sometimes reason for leaving at previous employers.
- Education verification: Confirming degrees and certifications claimed on your resume.
- Credit check: Used for roles involving financial responsibility or access to sensitive financial data. Less common than most people assume.
- Motor vehicle record (MVR): For roles involving driving.
- Professional license verification: For healthcare, legal, financial, and other licensed roles.
Background check timelines by type
Standard employment background check (criminal + employment verification): 3–5 business days. This covers the vast majority of office, retail, and professional roles.
Healthcare background check: 5–14 days. Healthcare roles require additional checks including OIG exclusion lists, professional license verification, and sometimes state-specific healthcare worker registries.
Financial services: 7–14 days. Credit checks, FINRA BrokerCheck (for registered roles), and sometimes state licensing verification add time.
Government and security clearance roles: 4–12 weeks for Secret clearance; 6 months to 1 year+ for Top Secret/SCI clearance. These are not standard background checks — they are full investigations conducted by federal agencies.
International employment verification: 2–6 weeks. Verifying employment at companies outside the US requires international research, which is slower. If you have significant international experience on your resume, this is a common delay driver.
Roles requiring an FBI fingerprint check: 2–4 weeks. Some healthcare, childcare, education, and financial roles require fingerprint-based FBI checks.
What causes a background check to take longer?
Several factors can extend a standard 3–5 day background check to several weeks:
Common name: If your name is common (think "Michael Johnson" or "Maria Garcia"), the background check vendor must manually disambiguate criminal records that match your name but belong to different people. This adds 3–10 days.
Employment at companies that no longer exist: If a previous employer has closed, been acquired, or outsourced their employment verification to a third party, confirming your tenure can take significantly longer.
Discrepancies between your resume/application and actual records: If the dates you provided don't match what the vendor finds, the vendor flags this for manual review, which adds time. Small discrepancies (off by a month on a start date) are usually resolved quickly; larger discrepancies require investigation.
International employment: As noted above, verifying overseas employers takes longer.
Court record delays: Criminal checks require pulling records from county courts, which varies in speed. Some rural counties process requests slowly. Juvenile records and expunged records can also create processing complications.
You haven't responded to the vendor's communication: Background check vendors often require you to complete an online authorization form and may send additional document requests. If you miss these emails (check spam), the check can't proceed.
Can you start work before the background check is complete?
It depends on the employer's policy and the role. In many industries, particularly retail, hospitality, and some office roles, employers allow candidates to start work provisionally while the background check processes. The offer remains conditional — if disqualifying information surfaces, employment can be terminated.
In regulated industries — healthcare, finance, childcare, and roles requiring security clearance — starting before the background check is complete is typically not permitted. Compliance requirements prohibit it.
Ask your recruiter directly: "Is there any flexibility to start my onboarding before the background check completes?" A good recruiter will give you a straight answer. If the background check is taking longer than expected and your start date is at risk, proactive communication with HR is better than waiting and hoping.
Also: if you have a prior criminal record, bankruptcy, or know that your employment history has discrepancies, address this proactively with HR after the offer stage rather than hoping it doesn't surface. Transparency at the offer stage is treated much more favourably than a surprise in the background check.