What it means
When an insurance company sells a policy, the customer pays a price called the premium. This total initial amount is known as the gross written premium.
However, insurance companies do not always want to keep all the financial risk of every policy they sell. To protect themselves from massive losses, such as a major hurricane or an unusual cluster of car accidents, they buy their own insurance.
This secondary insurance is called reinsurance. By paying a portion of their collected money to a reinsurer, the primary insurer shares the risk.
Net written premium is what remains after subtracting the cost of reinsurance from the gross written premium. For non-finance managers, understanding this concept is crucial because it represents the true top-line revenue that an insurance business retains to cover future claims and operating expenses.
If a company has a high gross written premium but a very low net written premium, it means they are passing almost all their risk and money to other firms, limiting their potential earnings. In practical terms, this metric helps leaders judge whether their underwriting strategy is working effectively.
It acts as the baseline for calculating earned premiums, which is the actual revenue recognised over time as the policy period unfolds. Monitoring net written premium allows stakeholders to see whether the company is growing its retained portfolio sustainably without taking on dangerous levels of uncovered risk or over-relying on reinsurance partners.
Imagine you run a bakery and take 100 custom cake orders. You keep 80 of them to bake yourself, but outsource 20 tricky tiered cakes to a partner bakery, paying them $20.
The net cakes you keep are 80.
In practice
Real-world examples
Example 1
Apex Property Insurance sells home policies totalling $500,000 in a month. They pay $100,000 to reinsurers to share storm risks. Their net written premium is $400,000, which is 80% of what they sold. The underwriting team uses that figure to set the next month's sales targets.
Example 2
BrightFleet Fleet Insurance collects $1,200,000 in annual premiums from delivery firms. They cede $300,000 to reinsurers. Their net written premium for the year is $900,000, and the finance director reports this figure to the board as the measure of retained business.
Example 3
SafeGuard Marine writes $2,000,000 in cargo policies for shipping clients. They purchase $1,500,000 of reinsurance to cover large ocean disasters. Their net written premium is $500,000, only 25% of gross sales, because a single ocean disaster could produce claims far larger than the firm's own capital.
Think of it
Imagine you run a bakery and take 100 custom cake orders. You keep 80 of them to bake yourself, but outsource 20 tricky tiered cakes to a partner bakery, paying them 20 pounds. The net cakes you keep are 80.
Formula
Calculation
Net Written Premium = Gross Written Premium - Reinsurance Ceded
Worked example: an insurer collects $1,000,000 in gross premiums and pays $250,000 to reinsurers, so net written premium = $1,000,000 - $250,000 = $750,000.
A useful follow-up is the retention ratio, which shows how much of the business the insurer keeps: $750,000 / $1,000,000 = 75%. If next year gross premiums rise to $1,200,000 and reinsurance ceded rises to $480,000, net written premium becomes $720,000 and the retention ratio falls to $720,000 / $1,200,000 = 60%, so the insurer is keeping less of each dollar it sells even though gross sales grew.Case study
Seen in the real world
This is a fictional, illustrative scenario. Stellar Life Assurance, a medium-sized provider of term life policies, wanted to expand its market share by taking on higher-risk clients. During the third quarter, the firm generated $4,000,000 in gross written premiums. Management knew that retaining all these high-risk policies could bankrupt the company if claims spiked.
To manage this exposure, they partnered with a global reinsurer, paying $1,500,000 in reinsurance premiums to transfer a significant portion of the potential payout liabilities. When reviewing the quarterly financial report, the finance director highlighted that Stellar Life's net written premium stood at $2,500,000. This figure provided a realistic picture of the revenue the company actually controlled and needed to match against operational costs and expected claims. By analysing the net written premium alongside historical claim data, the leadership team realised they had struck the right balance.
They achieved solid top-line retention while successfully safeguarding the firm's capital reserves from catastrophic loss events. The retention ratio told the same story. Stellar Life kept $2,500,000 / $4,000,000 = 62.5% of the premiums it wrote and passed on 37.5%. The board agreed to review this ratio every quarter, and to buy more reinsurance if the share of high-risk policies grew faster than the company's capital reserves.
Watch out
Common mistakes
- Treating net written premium as cash received in the bank, ignoring that policies are paid in instalments.
- Confusing gross written premium with net written premium and ignoring reinsurance costs.
- Assuming a higher net written premium always means higher profit, without checking the quality of the underlying risks.
Questions
People also ask
Is net written premium the same as revenue?
It is the starting point for insurance revenue, but insurers recognise revenue over time as earned premium, not all at once when the policy is written.
Why do insurance companies buy reinsurance?
They buy reinsurance to limit their financial exposure to catastrophic events and to free up capital so they can write more policies safely.
What does a sudden drop in net written premium indicate?
It usually means the company is either selling fewer policies or has decided to purchase significantly more reinsurance to protect against risk.