AIB Group (AIBG) Fundamentals: Irish Mortgages and Deposits

Any serious AIB Group stock analysis has to start with a simple observation: this is a bank whose fortunes are tied very closely to one small, fast-growing economy. AIB Group plc is one of Ireland’s two large domestic lenders, with a secondary business in Great Britain and a treasury operation that invests the surplus from a very large deposit book. It reports in euro, holds roughly a 30% share of new Irish mortgage lending, and in June 2025 left Irish State ownership. For investors following the London market, the shares trade there as a CDI under the ticker AIBG and are quoted in pence, while the primary listing on Euronext Dublin is quoted in euro — a distinction that matters more than it sounds.

How AIB Group Makes Its Money

AIB organises itself into three customer-facing segments. Retail Banking is the largest and covers personal current accounts, mortgages, consumer credit and small business lending across the Republic of Ireland. Capital Markets houses corporate and institutional lending, syndicated and project finance, and the specialist energy and infrastructure teams. AIB UK runs a smaller business in Great Britain and Northern Ireland, focused on selected corporate niches rather than mass-market retail. Alongside these sit wholesale treasury activities and group support functions.

The economics are those of a classic deposit-funded commercial bank. AIB gathers money from Irish households and companies at a low cost, lends a portion of it out as mortgages and business loans, and parks the rest in liquid investment securities and central bank deposits. The gap between what it earns on those assets and what it pays for funding is net interest income, and it is overwhelmingly the dominant line. In the six months to 30 June 2026 — AIB reports half-years rather than quarters, with the H1 2026 results published on 30 July 2026 — net interest income was €1,871m out of total operating income of €2,282m. Fees, commissions and other income contributed the remaining €411m.

That mix tells you where to look. A bank earning more than four-fifths of its income from interest spread is, in effect, a geared play on euro interest rates and the volume of credit in its home market. The fee side is real and growing, but not yet large enough to change the character of the business.

AIB Group Stock Analysis: What the H1 2026 Numbers Show

The half-year figures to 30 June 2026 give a reasonably clear picture of where the business currently sits. Profit after tax was €939m, marginally ahead of the €927m reported in H1 2025. Earnings per share came in at 42.2 cent, and return on tangible equity was 23.2%. For a European bank a return in the low twenties is high, and understanding why is the central question in any AIB Group stock analysis.

Part of the answer is margin. The net interest margin for the half was 2.68%, with management pointing to an exit margin of 2.71% in the second quarter. Net interest income of €1,871m was essentially flat against €1,874m a year earlier, which is itself worth noting: euro policy rates have come down from their peak, and a flat interest line in that environment means volume growth and asset repricing have offset the rate headwind rather than simply ridden a rising tide.

Volumes did grow. Gross loans rose 3% to €74.5bn, and new lending across the group was up 10% year on year at €7.5bn. Irish mortgage lending of €2.0bn was 1% higher than the prior half, though AIB’s market share slipped to 30% from 32% in H1 2025 — a reminder that Irish mortgage competition is live. The company also cited a 46% share of direct-to-customer mortgage originations, a narrower measure covering business written without a broker. In Capital Markets, new lending rose 4% to €2.2bn, with Climate and Infrastructure Capital contributing €1.2bn, up €0.6bn.

Costs behaved predictably. Operating expenses of roughly €1,001m were 2% higher, and the cost-to-income ratio held at 44%, in line with guidance. Full year 2025 showed the same 44% ratio on operating costs of €1,992m, so efficiency has been stable rather than improving.

Management lifted full-year 2026 guidance alongside the results, now expecting net interest income above €3.8bn, other income of about €800m, loan growth of around 5% and return on tangible equity above 20%. Set against FY2025 net interest income of €3,748m, that guidance implies the interest line has stopped shrinking. The shares nonetheless fell on the day, by roughly 3.7% according to contemporaneous reports, which is a useful illustration of how much expectation was already in the price.

The Deposit Base and the Interest Rate Question

AIB’s funding position is the quiet strength in the accounts and the main reason its margin is what it is. Customer deposits stood at €118.8bn at 30 June 2026, up 1.3% from €117.2bn at December 2025, and account for 83% of total funding. Around 93% of those accounts are based in the Republic of Ireland. Set that €118.8bn of deposits against €74.5bn of gross loans and you get a loan-to-deposit ratio of 62%.

That ratio is the crux of the rate story. A bank lending out only 62 cent of every euro it takes in has a large surplus to deploy elsewhere — in AIB’s case investment securities, which rose 12% to €24.2bn in the half and are held mainly for liquidity, plus central bank balances. When policy rates are high that surplus earns well and costs little, because a current account paying nothing cannot reprice downwards. When rates fall, the surplus earns less while the loan book, much of it fixed-rate Irish mortgage debt, reprices more slowly. It is the single most important sensitivity to understand here.

The Irish market structure amplifies the effect. After the departure of Ulster Bank and KBC from the Republic, retail banking there is concentrated between AIB and Bank of Ireland (BIRG), with credit unions and smaller non-bank lenders around the edges. Concentration has helped deposit pricing stay favourable, but the competitive dynamic can shift quickly if a new entrant decides the returns justify the effort, and the two-point slip in mortgage share suggests pricing pressure is not purely theoretical.

Capital, Dividends and Buybacks After the State Exit

The ownership story is central to how AIB’s capital is now used. The Irish State sold its final 2.06% holding on 16 June 2025 at €6.94 per share, raising about €305.3m and bringing the total returned to the State from its AIB investment to roughly €19.8bn. The bank has been fully privately owned since.

What followed was a substantial step up in distributions. For FY2025, AIB reported profit after tax of €2,139m, earnings per share of 93.3 cent and return on tangible equity of 25.0%, and announced total distributions of €2.25bn — a payout ratio of about 105%, comprising a sharply higher cash dividend and a €1bn share buyback. A payout above 100% means the bank distributed more than it earned in the period, drawing on accumulated surplus capital rather than funding the dividend purely from current profits. That is a deliberate exercise in shrinking an over-capitalised balance sheet, not a run rate.

Capital remains comfortable. The CET1 ratio was 16.2% at December 2025, up from 15.1% a year earlier, helped by organic capital generation of about 370 basis points and roughly 25 basis points from a mortgage significant risk transfer completed in December 2025. At 30 June 2026 CET1 stood at 16.1%, with organic generation of about 170 basis points in the half. The H1 2026 interim dividend was declared at 19.528 cent per share, worth around €406m, and €410m of the €1bn buyback had been completed by June.

The thing to watch is how long surplus capital lasts. Buybacks funded from excess capital are finite; once CET1 reaches whatever level the board and the regulator settle on, distributions have to come from earnings. The pace of that transition will shape the cash shareholders actually receive.

Credit Quality and the Risks

Loan losses are the fastest route from a 23% return on tangible equity to something far lower, so credit quality deserves close attention. Non-performing exposures were 2.35% of gross loans at 30 June 2026, up from 2.20% at the end of 2025 and from roughly 2.3% at the Q1 2026 trading update published on 30 April 2026. The expected credit loss charge for the half was €91m, a cost of risk of about 25 basis points, against full-year guidance of 20 to 30 basis points. FY2025 carried a net credit impairment charge of €172m, equivalent to 24 basis points.

Those are benign numbers by historical standards, and benign credit numbers are a cyclical condition rather than a permanent feature. The drift upwards in the non-performing ratio is small, but it is the kind of line that rewards tracking across several reporting periods rather than judging from one.

The concentration risks are easy to list and harder to hedge. The loan book is heavily exposed to Irish residential property and Irish small and medium-sized enterprises, so Irish employment, house prices and construction activity feed through directly. Ireland’s corporation tax receipts and much of its employment depend on a concentrated group of multinational employers in technology and pharmaceuticals, so changes in international tax arrangements reach AIB indirectly through the domestic economy. AIB UK adds a translation element, since sterling earnings are reported into euro accounts.

Valuation: What the Multiples Measure

On valuation, the mechanics matter more than any single figure. In mid-to-late October 2026 the shares traded at roughly €10.80 on Euronext Dublin, on a trailing price-to-earnings multiple of around 11 to 12 times and a trailing dividend yield in the region of 6%. Published price-to-tangible-book readings have been near 1.7 times. On the London CDI line, quoted in pence rather than pounds, the shares changed hands at around 920p — that is £9.20, not £920 — in mid-October 2026.

For a bank, price-to-tangible-book and return on tangible equity are two halves of the same question. A bank earning 23% on tangible equity compounds book value quickly, and a multiple above one times tangible book reflects a market view that returns will stay above the cost of equity for some period. The multiple does not say whether that view is correct. It does mean a reversion in return on tangible equity towards the mid-teens — through margin compression as euro rates settle, higher credit costs, or distributions dropping back below 100% of earnings — would be measured against a starting multiple that already assumes a good outcome. Equally, a trailing yield near 6% is inflated by the unusually large FY2025 payout.

What to Watch From Here

The useful conclusion to an AIB Group stock analysis is a short list of lines in the next accounts that would change the picture. The first is net interest margin and the quarterly exit rate: 2.68% for H1 2026, exiting at 2.71%, with full-year net interest income guided above €3.8bn. Whether that margin holds as euro rates settle is the main swing factor in earnings. The second is Irish mortgage market share, which fell from 32% to 30% year on year; another step down would say competition is biting, while stability would support the volume side of the guidance.

The third is the non-performing exposure ratio and cost of risk — 2.35% and about 25 basis points at the half year — where a sustained move outside the 20 to 30 basis point guidance range would matter far more than a few basis points of margin. The fourth is capital and the shape of distributions: CET1 at 16.1%, a €1bn buyback roughly 40% complete at June, and what happens to the payout once surplus capital is normalised.

Those lines will determine whether AIB’s current returns prove durable or cyclical. The same questions arise for larger UK-listed banks such as NatWest Group (NWG) and Barclays (BARC), and for domestic peer Bank of Ireland (BIRG), but in AIB’s case the answers depend unusually heavily on one country’s housing market and deposit base.