Premium audits on business insurance: how revenue and payroll adjustments work

On an auditable liability policy, the premium you pay at the start is a deposit based on your estimate of revenue, payroll or another exposure base. After the policy year ends, the insurer asks for the actual figures, recalculates the premium at the same rate, and sends you a bill for additional premium or a return of premium, often subject to a minimum premium it keeps regardless. Estimating honestly, updating the insurer if your business changes during the year, and keeping the records ready avoids a surprise bill and, more importantly, avoids an argument about coverage.

This guide is part of the business insurance quote checklist. Rates and amounts are illustrative.

Which policies are audited

Auditable policies are most common where the exposure varies with activity:

Many small office and retail policies are not audited, or are written on a flat premium. Check the declarations page: auditable policies usually state the rate, the estimated exposure and the words "deposit premium" or "subject to audit".

How the adjustment is calculated

Premium = (actual exposure / unit) x rate, then compared with the deposit.

Example 1: revenue grew (illustrative). An Ontario landscaping firm estimated $500,000 of revenue at an illustrative rate of $4.00 per $1,000.

• Deposit premium: 500 x $4.00 = $2,000
• Actual revenue: $640,000
• Earned premium: 640 x $4.00 = $2,560
• Additional premium: $2,560 - $2,000 = $560
• Ontario RST at 8% on the additional premium: $44.80
• Audit bill: $604.80

Example 2: revenue fell (illustrative). The same firm had a slow year with $420,000 of revenue.

• Earned premium: 420 x $4.00 = $1,680
• The policy has a minimum earned premium of $1,800
• Return premium: $2,000 - $1,800 = $200, not $320, plus the corresponding share of tax

Example 3: wrong class. The auditor finds $90,000 of the revenue came from snow removal, which the insurer rates at an illustrative $9.00 per $1,000 rather than $4.00. The difference on that revenue is 90 x ($9.00 - $4.00) = $450 of extra premium. The more serious issue is whether snow removal was disclosed at all; if it was not, a slip-and-fall claim from a client's parking lot could be disputed. See disclosure and misrepresentation.

Physical, phone and self-audits

Insurers use different audit methods:

• Self-audit or mail audit: you complete a form with your actual figures and sign it, sometimes with supporting documents.
• Phone or virtual audit: an auditor walks through the figures with you or your bookkeeper.
• Physical audit: an auditor visits and reviews the books, typical for larger or complex risks.

Respond on time. Many policies allow the insurer to charge an estimated additional premium if you do not provide the figures, and an unpaid audit bill can affect renewal or lead to cancellation of a current policy.

How subcontractors affect the audit

For contractors, payments to subcontractors are examined closely. If you cannot show a certificate of insurance for a subcontractor that was valid during the job, the auditor may add those payments to your payroll or revenue base. Keep certificates by job and by date. See contractor liability quotes.

Preparing for the audit: checklist

• Financial statements for the policy period, or your sales reports if the policy year does not match your fiscal year
• Payroll registers and T4 summary, split by type of work if the policy has several classes
• Your workers' compensation payroll declaration for the same period, which auditors often compare
• GST/HST or QST returns for the period, which show revenue
• Subcontractor list with amounts paid and certificates of insurance
• Notes on any new activities started during the year

Managing the cash-flow impact

• Update your estimate mid-year if revenue is clearly running ahead. Some insurers will adjust the deposit, spreading the cost rather than leaving it to a single audit bill.
• Budget for the adjustment if your business is growing; a simple rule is to set aside the rate times the expected excess exposure each month.
• Ask for a monthly reporting basis if your exposure swings widely; some programs report and pay monthly.
• If you finance the premium, note that the audit bill is usually payable separately and promptly.

Frequently asked questions

Can the insurer audit a policy I cancelled?

Yes. If you cancel mid-term, the auditor will ask for figures up to the cancellation date, and the earned premium is calculated on that period, subject to any short-rate or minimum premium terms. See cancelling mid-term.

Is it better to under-estimate revenue to pay less up front?

It only moves the payment to the audit, and a deliberately low estimate can be treated as misrepresentation. Give your best honest estimate.

Is the audit adjustment taxable?

The additional premium carries the same provincial tax treatment as the original premium. In provinces without a tax line on premiums, nothing is added.

What if I disagree with the audit?

Ask the auditor or broker for the calculation, provide additional records, and request a review. Disputes about classification are common and often resolved with better documentation.

Sources

• Insurance Bureau of Canada — information on business insurance premiums
• Canada Revenue Agency — T4 summaries and GST/HST returns
• Revenu Québec — QST returns and payroll filings in Quebec
• WSIB Ontario — payroll reporting for workers' compensation