Why Two NAB Valuation Models Produce Such Different Answers

National Australia Bank shares closed at $36.52 on 15 May 2026. Two standard valuation methods applied to that same price produce estimates of $40.23 and anywhere from $35.74 to $51.66. That gap is not a mistake. It is the question this article unpacks. With the Reserve Bank of Australia (RBA) having lifted the cash rate three times in 2026 to reach 4.35%, the assumptions that underpin any bank valuation have shifted materially from even twelve months ago. Discount rates are higher, deposit competition is intensifying, and the credit cycle is no longer operating from historically benign conditions. For dividend-focused investors holding or considering NAB, the timing matters. What follows applies both a price-to-earnings (P/E) ratio method and a Dividend Discount Model (DDM) directly to NAB’s current reported data, explains what each output means in plain terms, identifies where each method is likely to mislead, and synthesises a practical view of whether the $36 price level reflects fair value or leaves room for either concern or opportunity.

What NAB’s current price tells us before any model is applied

Before applying any valuation methodology, the raw inputs deserve attention on their own terms. NAB’s recent financial data provides the baseline that both models draw from:

• Share price: $36.52 (closing, 15 May 2026); trading range across 12-15 May: $36.42-$36.86
• FY24 earnings per share (EPS): $2.26
• 1H FY2026 interim dividend: 85 cents per share, fully franked
• CET1 capital ratio: 11.65% (1H FY2026)

These figures anchor every calculation that follows. The share price is stable within a narrow band. The interim dividend confirms the payout remains fully franked, which carries specific implications for Australian resident investors that the DDM section will address.

How NAB compares to Big Four peers

Commonwealth Bank commands the highest P/E and price-to-book ratio in the Big Four, a structural premium that has persisted across multiple reporting cycles rather than reflecting any short-term anomaly. NAB sits in the mid-pack alongside ANZ and Westpac on earnings multiples, trading at a discount to CBA. At current prices, NAB’s fully franked dividend yield is more attractive than CBA’s, positioning it as an income story rather than a growth story. That distinction matters for the valuation methods ahead.

How the PE ratio method produces a sector-adjusted price estimate for NAB

The P/E method divides the current share price by earnings per share to derive a multiple, then applies the sector average multiple to the same EPS to produce a sector-adjusted price estimate. It answers one question: is this stock cheap or expensive relative to its peers?

NAB’s implied PE of 16.1x sits below the banking sector average of 18x. Multiplying the sector average by NAB’s FY24 EPS of $2.26 produces a sector-adjusted price of $40.23, roughly 10.8% above where the stock closed last week.

That looks like a discount worth investigating. It may also be a trap.

The 2022-2025 period delivered ultra-low bad debts and net interest margin (NIM) expansion from rising rates. Those conditions inflated bank earnings across the sector. If current EPS represents a cyclical peak rather than a sustainable run-rate, the denominator in the PE calculation flatters the stock. Share buybacks can further boost EPS mechanically without improving underlying profitability, and one-off items can distort reported figures.

The NIM tailwind from the rate-hike cycle has largely played out across the sector, and investors who extrapolate that expansion forward risk overstating future EPS, which directly inflates the denominator in any PE-based target price calculation.

“A P/E ratio built on peak earnings is not a margin of safety.”

What the Dividend Discount Model is and why it suits bank stocks

Many Australian investors hold bank stocks primarily for income. The DDM formalises that intuition into a price estimate. It says: the fair value of a share equals the present value of all the dividends it will pay in the future.

In its simplest form, the model has three inputs:

1. The expected annual dividend: what the company pays now, and whether that figure includes franking credits for eligible investors
2. The required rate of return (discount rate): what return an investor demands for holding the stock, influenced by prevailing interest rates and the stock’s risk profile
3. The expected dividend growth rate: how quickly dividends are expected to grow over the long term, constrained for banks by APRA capital requirements and credit cycle dynamics

Banks suit this model because they are stable, high-payout businesses with predictable (if cyclical) dividend histories, unlike growth companies that retain most of their earnings.

The franking credit adjustment is where the Australian context changes the arithmetic materially. NAB’s most recent full-year cash dividend of $1.69 per share becomes $2.44 once franking credits are factored in for eligible Australian resident investors.

“NAB’s fully franked $1.69 cash dividend becomes $2.44 once franking credits are factored in for eligible Australian investors.”

That grossed-up figure is not a bonus. It is a structural input. Using the cash dividend alone understates the effective yield that a domestic investor receives, which in turn understates the DDM’s implied fair value.

Applying DDM to NAB: the sensitivity problem and the $35.74 to $51.66 range

The DDM’s strength is also its limitation. Small changes in the discount rate or growth rate assumption produce dramatically different outputs.

Using a blended range of growth rates (2%-4%) and discount rates (6%-11%), the averaged DDM valuation comes to approximately $35.74. Using the grossed-up franked dividend of $2.44, the model produces $51.66. An adjusted dividend figure of $1.71 yields $36.16, broadly in line with the current share price.

The sensitivity grid below illustrates the range:

The extremes are instructive. At an 11% discount rate with 2% growth, NAB is worth $19.00. At a 6% discount rate with 4% growth, it is worth $85.50. Neither extreme is likely, but the spread forces explicit choices.

“At 4.35%, the RBA cash rate is now a material input to discount rate assumptions. DDM calibrations from the low-rate era need revisiting.”

The RBA raised the cash rate by 25 basis points on 4 February, 18 March, and 6 May 2026, bringing it to 4.35%. Each of those decisions pushed the appropriate discount rate higher. A DDM calibrated to the near-zero rate environment of 2020-2022 would materially overstate fair value today. The width of the range is not a failure of the model; it is the model forcing transparency about the assumptions that matter most.

Three consecutive rate hikes through February, March, and May 2026 were supported by eight of nine Board members at the final meeting, a near-unanimous margin that reflects the persistence of trimmed mean inflation at 3.3%, well above the RBA’s 2-3% target band.

What PE and DDM miss: the macro and structural factors that should sit alongside any model

Both models accept their inputs as given. Neither interrogates whether those inputs are about to change. Three macro variables deserve attention because each one feeds directly into the earnings, dividends, or discount rates the models depend on:

• Rate path: Three consecutive 25bp hikes through early 2026 lifted the cash rate from below 3.85% to 4.35%. Further moves remain data-dependent. Higher rates initially supported NIM expansion, but deposit competition and migration to higher-yield products increasingly cap the net benefit.
• Unemployment trend: Australian Bureau of Statistics Labour Force data shows the national unemployment rate in the mid-3% to low-4% range in early 2026. Analyst commentary expects a drift higher as rate rises feed through, representing a direct risk to loan loss experience across the banking sector.
• Housing market: CoreLogic reports continued dwelling price growth through early 2026, though the pace is slowing. Rising home prices support collateral values and reduce loss-given-default, but affordability pressures and high debt-service ratios increase tail risk if unemployment rises.

NAB’s SME exposure and the credit quality question

NAB’s significant small-to-medium enterprise (SME) and business banking book means credit losses may prove more sensitive to unemployment and rate fatigue in the SME sector than for a purely mortgage-focused peer. Provision levels remain benign by historical standards, but a normalisation of bad debts from the unusually low levels of 2021-2023 represents a credible downside scenario heading into the second half of 2026. NAB’s CET1 ratio of 11.65% provides a buffer against provisioning stress and surplus capital context for ongoing buybacks, but it does not eliminate the risk that forward earnings fall below the trailing figures both models rely on.

APRA capital adequacy standards set the minimum CET1 ratio at 4.5% with an additional capital conservation buffer, meaning NAB’s reported 11.65% CET1 ratio sits well above the regulatory floor and provides measurable headroom for maintaining the current dividend payout.

What both models say together, and what a $36 entry price actually means for dividend investors

The PE analysis implies modest upside. The DDM base case suggests the current price is broadly in line with fair value. The franking-adjusted DDM implies material upside, but only if the growth and discount rate assumptions behind it hold under scrutiny.

Taken together, the range places NAB near or at the lower bound of reasonable fair value estimates. For income investors specifically, the fully franked yield at current prices represents the primary investment thesis. Capital growth depends on earnings not deteriorating from here.

Grossed-up yield comparisons across the Big Four sharpen the income argument: ANZ’s confirmed raw yield of 4.58% grosses up to approximately 5.95%, while CBA’s grossed-up yield of approximately 4.10% currently matches the RBA cash rate, illustrating why NAB’s fully franked yield at $36 represents a more competitive income proposition than the raw dividend figures alone suggest.

For the more optimistic DDM estimate of $51.66 to be valid, dividend growth would need to sustain at least 3-4% annually while the appropriate discount rate remains moderate, a combination that three consecutive rate hikes make harder to defend. For the current price to prove expensive, earnings would need to fall materially as NIMs compress and provisions normalise, a scenario that the macro backdrop makes plausible though not yet evident in reported results.

“Both models place NAB somewhere between ‘fairly priced’ and ‘modestly undervalued’ at $36. The distance between those conclusions depends almost entirely on which dividend and discount rate assumptions you are prepared to defend.”

How to update your NAB valuation as conditions change

PE and DDM outputs are analytical anchors, not buy or sell signals. The wide DDM sensitivity range is itself the most instructive output of this exercise, because it reveals which assumptions carry the most weight.

Three inputs matter most for updating any NAB valuation from here: future RBA decisions, which directly affect the appropriate discount rate; NAB’s next full-year results, which will reveal whether trailing EPS remains a reliable baseline or is beginning to normalise lower; and any shift in SME credit quality trends, which would alter both the earnings and dividend trajectories both models depend on.

Investors who have worked through both methods with real NAB data are now equipped to reassess their position as conditions change, rather than reacting to price movements alone.

For investors wanting to layer additional frameworks on top of PE and DDM outputs, our full explainer on ASX bank valuation methods covers price-to-book ratios, DCF approaches, and the qualitative checks on management, APRA capital requirements, and loan book quality that quantitative models cannot capture on their own.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results. Financial projections are subject to market conditions and various risk factors.