Estimated premium is the temporary premium charged at the start of a policy before the insurer knows the insured’s final exposure. It is common in commercial insurance, where payroll, sales, receipts, or other exposure bases can change during the policy term.
Why insurers use it
Some policies cannot be priced perfectly on day one. The insurer may need to start with a reasonable estimate based on expected operations and then true up the premium later. This is common in:
- workers compensation
- general liability
- commercial auto fleets
- inland marine and reporting-form property programs
The estimated premium gives the insurer enough premium to put coverage in force while preserving the right to adjust the final amount after the actual exposure is known.
How final premium is determined
At the end of the term, or sometimes during it, the insurer may audit the account. If actual payroll or sales were higher than estimated, the insured may owe additional premium. If they were lower, the insured may receive a return premium, subject to minimum premium rules.
This matters for budgeting and for claims. A large claim can happen even when the original estimate was low, so the premium adjustment process protects the insurer from under-collecting for the exposure it actually insured.
Practical example
A contractor begins the year expecting $800,000 in payroll and is charged an estimated workers compensation premium based on that amount. By year-end, payroll is $1.1 million because the business grew. After audit, the insurer recalculates the premium using the actual payroll and bills the difference.