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Certificate of Insurance (COI) Tracking for Subcontractors

Reference Business Updated Jul 24, 2026

Why this matters

When a contractor hires a subcontractor, the subcontractor's insurance covers their work. Without a current Certificate of Insurance (COI), the general contractor (GC) is exposed if the subcontractor's work damages property or causes injury. COI tracking is the system that ensures subcontractors maintain coverage. Without it, the GC's insurance becomes the de facto coverage for subcontractor's work, increasing GC's claims and premiums.

What a COI is

A Certificate of Insurance:

  • Proof that the subcontractor has insurance
  • Issued by the subcontractor's insurance carrier
  • Identifies coverage type, limits, dates, and beneficiary
  • One-page document typically

What COI shows

Insurance company

  • Name and contact

Policy information

  • Policy number
  • Effective date
  • Expiration date

Coverage types

  • General liability
  • Workers' compensation
  • Auto liability
  • Umbrella / excess liability

Coverage limits

  • Per occurrence
  • Aggregate
  • Specific to each coverage

Insured (subcontractor)

  • Business name
  • Address

Certificate holder (general contractor)

  • The GC's name
  • "Additional insured" designation (sometimes)

Specific endorsements

  • Specific provisions added
  • "Waiver of subrogation"
  • Additional insured (specific endorsement)

Why GC needs COI

Liability protection

  • Sub's work causes injury or damage
  • Sub's insurance covers
  • GC's insurance not impacted

Compliance with customers

  • Many customers require GC's subs to be insured
  • COI proves compliance

Insurance audit

  • GC's insurance audits at renewal
  • Uninsured subs cost GC (higher premium)
  • COIs reduce GC's premium

Legal protection

  • Customer's lawsuit names GC and subs
  • Insured subs reduce GC's exposure

Standard insurance requirements

For typical contractor's subcontractors:

General liability

  • $1 million per occurrence minimum
  • $2 million aggregate typical
  • Many GCs require $2 million per occurrence

Workers' compensation

  • State minimums
  • Required for any employees

Auto liability

  • $1 million minimum typically

Umbrella (depends)

For specific situations:

  • Higher limits for big customers
  • Specific endorsements
  • Specific coverages

Additional insured

A GC typically requires:

Additional insured endorsement

  • GC added as additional insured to sub's policy
  • Sub's insurance covers GC for sub's work
  • Specific endorsement required (not all policies include)

Why additional insured

  • GC's insurance not impacted
  • Sub's insurance covers GC's exposure from sub's work

Documentation

  • COI lists "ABC General Contractor" as additional insured
  • Backed up by endorsement

Cost

  • Some insurance includes (specific endorsement)
  • Most policies: small additional cost
  • Sub passes to GC sometimes

COI tracking process

Step 1: Request before work starts

For each subcontractor:

  • Request COI before starting work
  • Don't start work without it
  • Customer (GC) initiates

Step 2: Verify the COI

  • Check coverage types
  • Check limits meet requirements
  • Check effective dates (active during work)
  • Check additional insured designation
  • Check certificate holder is correct

Step 3: File the COI

  • Store electronically
  • Organized by subcontractor and date
  • Easy retrieval

Step 4: Track expiration

  • Note expiration date
  • Set reminder
  • Request renewal COI before expiration

Step 5: Update file

  • New COI when received
  • Old COI archived
  • Continuous coverage documented

COI tracking tools

Manual

  • Spreadsheet
  • Calendar reminders
  • File folder by sub

Software

  • Subcontractor management software
  • Procore, Smartsheet, others
  • Automated tracking and reminders

Outsourced

  • Compliance management services
  • Handle COI verification and tracking
  • Per-sub fee or subscription

For small GC (under 10 subs): manual works. For larger: software or outsourced.

Common COI issues

Expired COI

  • Sub's coverage lapsed
  • GC exposed
  • Request new COI; pause work if unwilling

Inadequate limits

  • Sub's coverage below requirements
  • GC may not have appropriate protection
  • Request upgrade or different sub

Wrong certificate holder

  • COI shows different GC
  • Doesn't actually protect this GC
  • Request corrected COI

Missing additional insured

  • COI doesn't list GC as AI
  • Specific endorsement needed
  • Request

Wrong coverage types

  • Missing workers comp
  • Missing specific coverage
  • Verify all required

Fake or fraudulent COI

  • Rare but happens
  • Verify with insurance carrier if suspicious
  • Specific to insurance fraud

Specific situations

One-time subcontractor

  • Get COI for the project
  • Track for the project duration
  • Specific to the project

Recurring subcontractor

  • Maintain on file
  • Update annually
  • Standard renewal process

Sub with multiple GCs

  • Sub provides COI to each GC
  • Each GC has their certificate

Sub starts new business

  • New entity; new insurance
  • New COI required
  • Don't carry old over

When sub doesn't have proper insurance

Options:

Decline to hire

  • Standard approach
  • Find different sub

Require sub to obtain

  • Sub procures insurance
  • COI provided

GC adds sub to GC's policy

  • Specific endorsement (less common)
  • GC's premium impacted
  • Coordinated with GC's insurance

Increase contractor responsibility

  • GC's policy covers sub's work
  • GC's insurance impacted
  • Higher GC premium
  • Not standard

The standard answer: require sub to have proper insurance.

Customer requirements

Some customers require:

Specific limits

  • $5 million coverage
  • Higher than typical

Specific endorsements

  • Waiver of subrogation
  • Specific additional insured

Specific coverage types

  • Pollution liability
  • Professional liability

Specific insurance carriers

  • Specific carrier reputation

The GC must meet customer requirements:

  • Pass requirements to subs
  • Verify subs meet
  • Document for customer

Insurance audit

Contractor's insurance carrier:

Annual audit

  • Reviews payroll and subcontractor costs
  • Uninsured sub work treated as own employee
  • Premium adjusted

Documentation

  • COI files for each sub
  • Reduces premium
  • Specific to each carrier

Common adjustment

  • Sub without COI: GC's premium increases (sub work added to GC's wages)
  • COI on file: sub work not counted in GC's payroll

For GC with high sub usage: COI tracking is significant premium savings.

Specific industries

Construction GC

  • High sub usage
  • COI tracking standard
  • Bonded performance required (some)

Property management

  • Less sub usage typically
  • COI for any contracted work

Healthcare / specific industries

  • Higher requirements
  • Specific endorsements

Documentation retention

Active subs

  • Current COI on file
  • Easy access

Inactive subs

References

  • ACORD (Association for Cooperative Operations Research and Development) certificate forms.
  • Standard insurance industry practices.
  • AGC (Associated General Contractors) best practices.
  • Manuall internal: Universal Business Insurance Basics.

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