Insurance Australia Group Limited

The Business

IAG writes home, motor and business insurance through three divisions. Retail Intermediated Australia (RIA), which carries the NRMA, CGU, WFI and recently acquired RACQ brands, generates roughly 56% of group gross written premiums (GWP, the total value of policies sold before reinsurance and cancellation adjustments). Intermediated Insurance Australia serves brokers and corporate clients, while the New Zealand division operates under the AMI, State and NZI names. The RACQ acquisition, absorbed in 2025, converted a long-standing underwriting agreement into full ownership, extending IAG's direct reach into Queensland.

Recent Performance

Earnings per share fell 24.5% in FY26, from 57.5 cents to 43.4 cents, as natural catastrophe claims exceeded IAG's own allowance by $114 million. That followed a stronger FY25 that itself benefited from favourable reserve movements, so the swing looks larger in isolation than against a normalised base. The share price has continued climbing through this earnings decline, a divergence worth understanding before deciding how to respond to it.

Outlook

Net earned premium growth is set to decelerate from 5.4% in FY26 to a more moderate pace in FY27, settling into a steadier band through FY29 as the hard pricing cycle fades. The underlying insurance margin should recover in FY27 as catastrophe claims normalise, then drift lower again by FY29 as home claims inflation and a rising catastrophe allowance offset expense efficiencies. Return on equity is expected to hold in the low-to-mid teens, comfortably above what we estimate as the company's cost of equity.

Key Risks

The dominant risk is interest rates. The current share price only makes full sense under an implied cost of equity meaningfully below where Australian government bond yields currently sit, meaning the valuation case embedded in the price depends on rates falling further than they have so far. Natural catastrophe costs are a second risk: the FY26 allowance was already breached, and further escalation in catastrophe frequency or severity would compress underlying margins further. Persistent home claims inflation, running near 15% for water damage, is a third pressure point, capable of eroding margin if IAG's annual repricing cycle lags the pace of cost increases.

What to Watch

The thesis-defining event is the ACCC's Phase 2 decision on the RAC WA acquisition, expected in the fourth quarter of 2026, which will confirm whether IAG can extend its West Australian growth pathway or whether that option value disappears. Two further catalysts matter: the FY27 half-year result in February 2027, showing whether the insurance margin is tracking back toward management's guided range, and any signal from the Reserve Bank on the timing of its first rate cut, a variable with an outsized influence on how the market prices insurers generally.

• Q4 2026 ACCC RAC WA Phase 2 decision — approval would extend IAG's brand-partnership model into Western Australia and add meaningful option value to the growth outlook.
• Feb 2027 FY27 half-year result — will confirm whether the insurance margin is recovering toward management's guided range.

Company Description

IAG is Australia and New Zealand's largest general insurer by premium, writing home, motor and business insurance across three divisions. Retail Intermediated Australia (RIA) is the core engine, holding the NRMA, CGU, WFI and RACQ brands and contributing around 56% of group gross written premium. Intermediated Insurance Australia (IIA) distributes through brokers and serves corporate and SME clients. The New Zealand division operates the AMI, State and NZI brands. The RACQ acquisition, completed in 2025, converted a long-standing underwriting agreement into full ownership, extending IAG's direct reach into Queensland's largest motoring club membership base.

Where the Growth Is

RIA is growing at roughly 5.5% a year, well ahead of the 2.5-3.0% pace in IIA and New Zealand, driven by the RACQ integration and continued premium repricing. The next leg of growth depends on ACCC approval of the RAC WA acquisition, which would add an estimated $1.5 billion of gross written premium and extend IAG's brand-partnership model into Western Australia. Approval is roughly a coin toss in our assessment: a meaningful positive if it proceeds, and a non-event for the growth outlook if it does not.

Competitive Position

IAG holds close to 30% of the Australian personal lines insurance market, a position strengthened by the RACQ deal and set to strengthen further if RAC WA proceeds. The core advantage is cost: IAG's expense ratio runs about 400 basis points below peers, worth an estimated $420 million a year, built on a single enterprise technology platform and AI-assisted claims handling, with roughly half of motor claims now lodged and processed without human intervention. The second advantage is reinsurance structure: a 35% whole-of-account quota share, $10 billion of per-event catastrophe cover, and a five-year volatility protection arrangement, which smooths earnings more than any Australian peer achieves. Both advantages appear to be widening rather than eroding, and we expect them to persist for the better part of a decade.

Management & Capital Discipline

Management has run a disciplined capital program over the past five years: the RACQ acquisition was funded from surplus capital rather than new equity, buybacks have run at $150-200 million a year, and the fully franked dividend has grown steadily. Disclosure on claims inflation and catastrophe cost pressures has been candid. One area worth watching: management frames an 11% decline in New Zealand commercial premium (in local currency) as deliberate underwriting discipline, a characterisation that may partly obscure share loss to more aggressive competitors in that market.

Financial Position

IAG's balance sheet is a genuine strength, underpinned by capital levels well above regulatory minimums and a reinsurance program that caps single-event catastrophe exposure. Investment income on the group's roughly $14 billion investment portfolio benefits from the current higher-rate environment, providing a partially offsetting tailwind to underwriting pressures. The combination of conservative reserving, strong capital buffers and a protective reinsurance tower means IAG could absorb a materially worse catastrophe season than FY26 without threatening the dividend.