How to Master Supplemental Information Underwriting in Your Agency

Supplemental information in underwriting is any data that an underwriter requests after receiving an initial submission but before issuing a quote. These requests extend commercial quoting cycles from 7-10 days to 14-21 days when handled reactively. Each round trip averages 5-7 business days: the request goes to the broker, the broker contacts the client, the client gathers the data, the broker reformats and sends it back, and the submission re-enters the underwriter's review queue. Per Vertafore 2025, supplemental requests occur on 45-55% of commercial submissions. Agencies that anticipate the 12 most common requests and include them with the initial submission cut average turnaround by 40% and improve hit ratios by 12 percentage points.

Key Takeaways

• Supplemental information requests occur on 45-55% of commercial submissions and add 5-10 business days per round trip, per Vertafore 2025
• The 12 most common supplemental requests are predictable based on risk type: include them proactively and eliminate the follow-up cycle entirely
• Proactive supplemental inclusion reduces average turnaround from 16 days to 9 days and improves hit ratios by 12 percentage points
• Each round of supplemental requests costs the agency $50-$85 in staff time for gathering, formatting, and transmitting, per IIABA 2025
• Underwriters give 5-7 business days to respond to supplemental requests before moving the submission to the bottom of the queue
• Submissions requiring zero supplemental follow-up are quoted 25% more often than those requiring two or more rounds, per Applied Systems 2025

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What Supplemental Information Is

After an initial submission, underwriters routinely request additional data before they can complete their risk analysis and issue a quote. These requests are not failures of the submission. They are a predictable part of the underwriting process for most commercial risks.

The problem is timing. A reactive agency treats supplemental requests as surprises. A proactive agency treats them as predictable requirements and includes them with the initial submission.

The 12 types of supplemental information requests account for 80-90% of all follow-up requests across commercial lines. Mastering this list means mastering the single most common source of avoidable submission delays.

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The 12 Most Common Supplemental Information Requests

1. Prior Carrier Loss Runs Not Included in Initial Submission

Loss runs are the most commonly missing item in initial submissions. When they are missing, the supplemental request is immediate. Include five years of currently valued loss runs from every prior carrier with the initial submission. If a loss run is unavailable, document the attempt to obtain it and include whatever historical data exists.

2. Currently Valued Loss Runs (Within 30 Days of Submission Date)

Underwriters distinguish between loss runs that are "current" (within 90 days) and those that are "currently valued" (within 30 days of the submission date). For accounts with open claims, a 90-day-old loss run contains reserve figures that may have changed significantly. Request updated loss runs within 30 days of the submission date for accounts with open claims.

3. Payroll Breakdown by Classification Code

For workers' comp submissions where total payroll was submitted without class code breakdown, underwriters request the detail before pricing. The payroll by class code determines which rate applies to each portion of the payroll. Submit actual payroll figures from payroll records, separated by each NCCI classification code and each state of operation.

4. MVR Reports for Specific Drivers

For commercial auto submissions, underwriters frequently flag drivers from the submitted list and request MVR reports for those individuals. The flagging criteria vary by carrier but typically include any driver with more than one moving violation in three years, any driver with a DUI in five years, or any driver listed as "occasionally operating" without further detail. Include MVRs for all drivers with the initial submission rather than waiting for individual requests.

5. Property Appraisal or Replacement Cost Estimate

When submitted building values appear insufficient for the structure described, underwriters request a current appraisal or replacement cost estimate before pricing. This occurs most frequently when: submitted values have not been updated in more than three years, the building description indicates a construction type with high replacement costs (fire-resistive, sprinklered), or the location is in a high-inflation construction market. Include a current appraisal for buildings over $2 million in insurable value.

6. Building Inspection Report

For older buildings (over 30 years) or buildings with deferred maintenance, underwriters may request an independent inspection report before binding. Proactively commissioning an inspection on borderline properties and including the report with the submission signals transparency and prevents the carrier from ordering a potentially unfavorable inspection independently.

7. Prior Carrier Declination Letters

For E&S submissions requiring a diligent search under state surplus lines regulations, carriers require documentation that the risk was declined by admitted carriers. Include declination letters from every admitted carrier approached, or a summary letter from the wholesale broker confirming that admitted market availability was exhausted. Missing diligent search documentation delays E&S binding regardless of how favorable the risk otherwise appears.

8. Financial Statements

For accounts above $25,000 in premium, underwriters routinely request three years of financial statements when they are not included in the initial submission. Include audited or compiled financial statements for all accounts above the premium threshold. For accounts where financial statements are unavailable (closely held companies that have not prepared formal statements), submit the most recent two years of business tax returns with a narrative explanation.

9. Completed Operations History by Project Type

For contractor GL submissions, underwriters request a completed operations history when the ACORD 126 lists "general contractor" without project type detail. The completed operations history should show: types of projects completed over the past five years, average project size, largest single project, and any completed operations claims. This data directly affects completed operations pricing and aggregate limits.

10. Subcontractor Agreement and COI Requirements

For general contractors and project owners, underwriters request sample subcontract agreements and documentation of COI requirements. The questions they are answering: does the subcontract contain hold-harmless and additional insured provisions, does the GC require subcontractors to carry adequate limits, and does the GC verify COIs before work begins? Include a sample subcontract agreement and a one-paragraph description of the COI verification process.

11. Professional License Copies

For professional liability submissions (architects, engineers, accountants, consultants), underwriters request confirmation of current professional licensure. Include copies of current professional licenses for the principals and any key licensed employees. For firms where licensure is required but the license is held in the firm's name rather than individual names, include the firm license.

12. OSHA 300 Logs

For workers' comp accounts with adverse loss history, underwriters request OSHA 300 and 300A logs for the past three years. The logs provide detail on injury types, affected body parts, days away from work, and corrective actions. Include OSHA 300 logs proactively for any account with a loss ratio above 50% or an EMR above 1.00. Proactively providing the logs, with a narrative explanation of the loss drivers and corrective actions, converts what would be a neutral supplemental exchange into an opportunity to reinforce your loss context narrative.

Supplemental Information: Trigger Conditions and Proactive Strategy

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The Proactive Strategy That Cuts Turnaround by 40%

The proactive strategy has two parts. Include items 1 through 4 in every commercial submission regardless of risk type. Include items 5 through 12 when the account profile matches the trigger condition for that item.

Applying this strategy to 1,000 annual submissions: items 1-4 get included with all 1,000 submissions, eliminating the most common supplemental request categories entirely. Items 5-12 get pre-assessed for each submission using a profile checklist, and the relevant items get included with the initial package.

The result: average supplemental request rate drops from 45-55% of submissions to under 20%. Each point of reduction saves 5-7 business days of turnaround and $50-$85 in staff time. For an agency doing 1,000 submissions annually, reducing supplemental requests from 50% to 20% eliminates 300 supplemental request cycles, saving approximately 2,100 business days of cumulative turnaround and $25,500 in staff time annually.

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How to Identify Likely Requests Before Submitting

Review each account's profile against the trigger conditions before finalizing the submission package. Use this profile assessment:

Adverse loss history (loss ratio above 50% or any claim above $25,000): include OSHA 300 logs, detailed loss narratives with remediation documentation, and proactively updated loss runs.

Workers' comp with multiple class codes: confirm payroll is broken out by code in the submission. Never submit aggregated payroll for multi-code WC accounts.

Contractor with subcontract labor: include completed operations history, sample subcontract agreement with hold-harmless provisions, and COI verification process description.

Property above $2 million in insurable value: include current appraisal if one exists. If no appraisal exists, note the absence and provide a replacement cost estimate.

Commercial auto with any driver who has traffic violations: include the MVR for that driver with a brief narrative note covering the violation date and any corrective action (defensive driving course completion, for example).

E&S submission: confirm diligent search documentation is included. Without it, the submission cannot bind regardless of underwriting approval.

Professional liability: confirm professional license copies are included for all licensed principals.

New business with no prior insurance history: include the most reliable available substitute data: management experience documentation, relevant industry certifications, safety program documentation, and a narrative framing the clean slate as an asset.

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Response Time for Supplemental Requests That Cannot Be Anticipated

Some supplemental requests are genuinely unpredictable. An underwriter reviewing a plastics manufacturer may request Material Safety Data Sheets for a specific chemical they noticed in the operations description. A property underwriter may request an engineering report for a building with unusual structural characteristics.

Respond within 24 hours. Not with the requested data necessarily, but with an acknowledgment and a specific delivery commitment. "We received your request for the MSDS documents. We will have them to you by Thursday, April 10." That response keeps the submission active in the underwriter's queue. Five days of silence moves the submission to the bottom.

When you send the supplemental data, include a brief note explaining how it addresses the underwriter's question. "Attached are MSDS for the three chemicals used in the plating process. All three are classified as low-hazard under OSHA standards. The facility maintains proper ventilation per OSHA 1910.1000 and provides PPE to all employees who handle these materials. See the attached ventilation inspection report from March 2026."

This approach does two things: it answers the specific question directly, and it provides additional risk quality context that supports a favorable quote.

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Organizing Supplemental Responses Professionally

When responding to multiple supplemental requests, send all items in one organized response. Not one item per email over three days. One complete response with every requested item labeled.

The response structure: a brief cover email listing every item included ("Attached are the four items you requested on April 5"). Attachments labeled to match the underwriter's request wording exactly. If the underwriter asked for "OSHA 300 logs for 2023-2025," the file is named "OSHA300Logs_2023-2025" not "safety records."

This organizational discipline signals professional handling. Underwriters build informal reputations for brokers based on how they handle supplemental requests. A broker who responds promptly with a complete, organized package earns faster turnaround on future submissions with that underwriter.

The inverse is also true: a broker who responds to five requests with five separate emails over five days, each with vaguely named attachments, earns a reputation for disorganization that affects every future submission.

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Tracking Supplemental Requests Across High-Volume Books

Agencies doing more than 200 commercial submissions per year need a system for tracking pending supplemental requests and response deadlines.

The minimum tracking requirement: a log of every open submission with columns for the submission date, carrier, underwriter name, supplemental items requested (with dates), response deadlines, and response dates. A simple spreadsheet works for agencies under 500 annual submissions.

For agencies above 500 annual submissions, AMS integration or a dedicated submission tracking tool prevents the most avoidable hit ratio problem: missing a supplemental request deadline because the submission fell out of the producer's awareness.

Underwriters give 5-7 business days to respond to supplemental requests before moving submissions to inactive status or declining to quote. The submissions that go quiet after a supplemental request are frequently the ones where the producer forgot to follow up with the client. A tracking system with automated reminders at day three prevents that failure.

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FAQ

What are the most common supplemental information requests from underwriters?

The 12 most common supplemental requests, in order of frequency, are: (1) prior carrier loss runs not included in the initial submission, (2) currently valued loss runs for accounts with open claims, (3) payroll breakdown by classification code for WC accounts, (4) MVR reports for specific flagged drivers, (5) property appraisal or replacement cost estimate, (6) building inspection report, (7) prior carrier declination letters for E&S submissions, (8) financial statements for accounts above $25,000 in premium, (9) completed operations history for contractor GL, (10) subcontractor agreement and COI requirements, (11) professional license copies, and (12) OSHA 300 logs for accounts with adverse WC loss history, per Vertafore 2025.

How long does an agency have to respond to a supplemental underwriting request?

Underwriters allow 5-7 business days for supplemental responses before moving submissions to the bottom of the queue or declining to quote. Respond within 24 hours with an acknowledgment and a specific delivery date, even if you cannot provide the data immediately. "We will have the OSHA 300 logs to you by Thursday" keeps the submission active. Five days of silence without a response signals that the submission is not a priority for the broker, which signals to the underwriter that it should not be a priority for them.

What supplemental information should be included proactively in every submission?

Include these four items with every commercial submission regardless of risk type: five years of currently valued loss runs from all prior carriers, financial statements (three years for accounts above $25,000 in premium), driver MVRs for all commercial auto submissions, and payroll broken out by classification code for all workers' comp submissions. These four items account for the majority of supplemental requests on standard commercial accounts. Including them proactively eliminates the most common follow-up cycle and cuts average turnaround by 3-5 business days per submission.

How do supplemental information requests affect quoting timelines?

Each round of supplemental requests adds 5-10 business days to the quoting timeline. The cycle: underwriter sends the request, broker receives it and contacts the client, client gathers the data (1-3 days), broker reformats and sends the response (1 day), underwriter receives the response and re-enters the submission into the review queue (1-3 days). For accounts with two or more rounds of supplemental requests, the total delay reaches 10-20 business days. Submissions requiring zero supplemental follow-up quote 40% faster than average and are quoted 25% more often, per Applied Systems 2025.

How should an agency organize its response to multiple supplemental requests?

Send all supplemental items in a single organized response, not piecemeal. The response should include a brief cover email listing every item provided, with attachments named to match the underwriter's exact request wording. If the underwriter requested "OSHA 300 logs for 2023-2025," the file should be named "OSHA300Logs_2023-2025," not "safety docs." Along with each data item, include a brief note explaining how it addresses the underwriter's question. This professional handling builds underwriter relationships and earns faster turnaround on future submissions.

What tools help agencies track and respond to supplemental underwriting requests?

Agencies under 200 annual submissions can track supplemental requests in a shared spreadsheet with columns for submission date, carrier, underwriter, items requested, response deadline, and response date. Agencies above 200 submissions benefit from AMS integration with submission tracking functionality. Applied Epic, Vertafore AMS360, and HawkSoft all offer submission tracking modules. BrokerageAudit's Submission Intake tracks pending supplemental requests by underwriter and submission, with automated reminders at day three of the response window, before the 5-7 day deadline that triggers queue demotion.

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BrokerageAudit's Submission Intake tracks pending supplemental requests by underwriter and submission, with automated reminders before response deadlines. See how it works →

Written by Javier Sanz, Founder of BrokerageAudit. Last updated April 2026.