Expense ratio

Category: Capacity and rating · Reviewed by Simon Temme, Account Executive · Last reviewed 2026-06-05

Expense ratio

The expense ratio is the proportion of earned premium absorbed by acquisition costs (commissions, taxes, levies) and operating expenses (staff, IT, premises, professional fees). It is the cost-side complement to the loss ratio in the combined ratio calculation.

Category: Capacity and rating Also known as: operating expense ratio, underwriting expense ratio Related concepts: combined ratio, loss ratio

Definition

The expense ratio is calculated as:

Expense Ratio = (Acquisition Costs + Operating Expenses) / Earned Premium

Where:

• Acquisition costs = commission paid to intermediaries, IPT and other taxes, levies (FSCS, etc.)
• Operating expenses = personnel costs, IT, premises, professional fees, regulatory levies

Expense ratios vary materially by class and distribution model:

• Direct personal lines: low expense ratios (15–20 per cent typical)
• Broker-distributed commercial lines: medium expense ratios (25–35 per cent)
• Specialty/Lloyd’s lines: higher expense ratios (30–40 per cent), reflecting underwriting intensity and broker remuneration

Legal / Regulatory basis

Expense ratios are reported under IFRS 17 and disclosed in Solvency II Pillar 3 reporting. They are not directly regulated but form the basis of efficiency analysis at the PRA and at rating agencies.

How it works in practice

Insurers monitor their expense ratios closely as a key measure of operational efficiency. Reducing the expense ratio — through automation, scale economies and disciplined cost management — is a structural lever for improving underwriting profitability without depending on the loss ratio.

The Lloyd’s market historically has had a higher expense ratio than the company market, reflecting the cost of subscription market placement, bureau processing and the more intensive nature of specialty underwriting. The Future at Lloyd’s and Blueprint Two programmes are designed in significant part to reduce the market’s expense ratio.

Example

An illustrative example: a UK SME broker-distributed commercial insurer reports an expense ratio of 32 per cent — comprising 18 per cent acquisition costs (broker commissions, IPT, FSCS levy) and 14 per cent operating expenses (staff, IT, premises). A direct personal motor insurer might report an expense ratio of 18 per cent for the same earned premium, reflecting direct distribution and digital efficiency.

See also

• /wiki/combined-ratio/
• /wiki/loss-ratio/
• /wiki/reinsurance-commission/

References

1. IFRS 17 Insurance Contracts — https://www.ifrs.org
2. Directive 2009/138/EC (Solvency II) — https://eur-lex.europa.eu
3. Lloyd’s Annual Reports — https://www.lloyds.com

This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-05. Next review: 2026-12-05.

Apex Insurance Brokers Limited. Authorised and regulated by the Financial Conduct Authority, FRN 724952. Registered in England and Wales, Companies House 07014570. This entry provides general information about UK insurance concepts and is not regulated advice. Consult your insurance broker on your specific position.