WACC, ROIC, Equity Spread: the new vocabulary every Japanese IR rep must own

TL;DR

• The TSE March 2023 request's most durable effect has been linguistic. Terms that were specialist jargon in 2022 — WACC, equity spread, ROIC tree, CROIC, PBR decomposition — are now standard boardroom and earnings-call vocabulary in Japan.
• Investor consensus working ranges per TSE consultations: cost of equity ~7–9%, WACC ~5–7% for typical Prime Market issuers. Companies disclosing cost of equity below ~5% are flagged in TSE's November 2024 "misalignment" booklet as a red flag.
• The two governing identities to memorise: PBR = ROE × PER, and PBR > 1 ⇔ E[ROE] > cost of equity. Every term in this glossary serves one of these two equations.

Why the vocabulary matters

A finance vocabulary is not decoration. Each term in the post-2023 Japanese governance lexicon is a precise instrument: it isolates a specific cause of value creation or destruction, and tells the investor what to look at. Imprecise vocabulary in an earnings briefing — saying "capital efficiency" without specifying whether you mean ROE, ROIC, or RONA, or saying "cost of capital" without specifying WACC vs. cost of equity — signals to a sophisticated investor that the management has not internalised the framework. The November 2024 TSE "misalignment" booklet specifically lists imprecise vocabulary as a pattern (see Post 4.4).

This module is a terminology atlas. Print it. Drill it. Translate it into your own MTM and CG report so the same word in Japanese always maps to the same word in English and to the same formula.

The cost-of-capital terminology atlas

The table below covers the eight terms every Japanese IR rep should be able to define, calculate, and locate inside their own company's financials.

How the terms fit together

The vocabulary is not a flat list — it has structure. Understanding the structure is more useful than memorising any individual definition.

Layer 1 — Inputs (the costs). WACC, cost of equity (rE), and cost of debt (rD) measure what capital demands from the company. These are determined by the market, not by management.

Layer 2 — Outputs (the returns). ROE, ROIC, and CROIC measure what the company delivers to its capital providers. These are determined by management.

Layer 3 — Spreads (the gap). Equity spread (ROE − rE), ROIC spread (ROIC − WACC), and Residual Income / EVA are the value-creation diagnostics — outputs minus inputs.

Layer 4 — Market readouts. PBR and PER are the market's verdict on the expected future value of those spreads. PBR = ROE × PER decomposes that verdict into a profitability and an expectations component.

The TSE request asks companies to manage layers 1–3; layer 4 follows. Every misalignment pattern in the November 2024 booklet can be traced to a confusion between these layers — most commonly, companies trying to manage layer 4 (PBR) directly without addressing layers 1–3.

Cost of equity: the contested number

Of all the terms in the atlas, cost of equity is the one most likely to be the subject of investor pushback. The reason is that companies and investors typically disagree.

The CAPM formula — rE = rf + β·(rm − rf) — requires three inputs:

• Risk-free rate (rf): typically the 10-year JGB yield. Around 1.0–1.5% in late 2024 / 2025, after BOJ exited NIRP. Up materially from the near-zero levels of 2016–2022.
• Beta (β): the stock's sensitivity to the market index, typically estimated over 5 years of weekly returns vs. TOPIX.
• Equity risk premium (rm − rf): the expected return on equities over risk-free assets. The Japanese institutional consensus is roughly 5.5–7%, though academic estimates vary widely.

A typical Japanese mid-cap might land at: rf ≈ 1.2% + β·1.0 × ERP·6% = ~7.2% cost of equity.

The TSE November 2024 "misalignment" booklet specifically flags companies disclosing cost of equity values "far below the level recognized by investors" — i.e., companies using artificially low rE to make the equity spread look positive. Common shortcuts that produce too-low numbers:

• Using a pre-BOJ-normalisation risk-free rate (e.g., 0.2% instead of 1.3%).
• Using an unrealistically low equity risk premium (3–4% rather than 5.5–7%).
• Using beta from a benign window that excludes pandemic/2022 volatility.
• Treating "WACC" as a substitute for rE in the equity-spread calculation.

A defensible 2025–2026 Japanese cost-of-equity disclosure should land between approximately 7% and 9%, with the exact number traceable to a CAPM calculation the IR team can defend in front of an investor. Below ~6% invites pushback; below ~5% will be flagged.

ROE vs. ROIC: the segment-level test

ROE is a corporate-level metric. ROIC is a business-unit-level metric. Both matter, and they answer different questions.

ROE answers: Is the company, in aggregate, earning more than its equity holders require?

ROIC answers: Is each individual business unit earning more than the blended cost of the capital that funds it?

The "ROIC tree" — popularised by Hitachi (6501) after FY2019 and now a near-mandatory feature of best-practice MTMs — disaggregates ROIC into operating margin × invested-capital turnover, then disaggregates each of those into operational drivers (gross margin, opex ratio, working capital days, fixed asset turnover, and so on). The tree's purpose is to let management identify, segment by segment, where in the business value is being created and where it is being destroyed — and to give investors a transparent map of the same.

The Hitachi integrated report (linked in Sources) is the canonical example: every segment publishes ROIC, the WACC hurdle is explicit, and segments below WACC are explicitly identified for portfolio review. Marui Group (8252) was the Japanese pioneer in EVA-style disclosure more than a decade before the TSE request and remains a reference example in the retail sector.

The Residual Income Model: the math behind the verdict

For IR reps who want to understand why equity spread determines PBR, the Residual Income Model (RIM) is the formal link. The model decomposes the market value of equity as:

V₀ = B₀ + Σ E[(ROEₜ − rE)·Bₜ₋₁] / (1 + rE)ᵗ

where V₀ is market value of equity today, B₀ is current book value, and the summation is the present value of all future residual incomes (equity spreads multiplied by book equity).

Two consequences fall out immediately:

1. If the market expects (ROE − rE) > 0 in perpetuity, V₀ > B₀ — i.e., PBR > 1.
2. If the market expects (ROE − rE) < 0 in perpetuity, V₀ < B₀ — i.e., PBR < 1.

This is why TSE describes PBR as a "verdict": the market is literally pricing the expected future equity spread, discounted at the cost of equity. The half of the Prime Market that traded below PBR 1 in March 2023 was, by RIM, the half of the Prime Market that the market expected to destroy value going forward.

This is also why managing PBR directly — through buybacks, marketing, or short-term share-price actions — does not solve the underlying problem. It is the expected future equity spread that needs to change. Buybacks can reduce the book equity denominator in ROE, which temporarily flatters the number, but a buyback that does not change the unit economics of the business does not change the long-run residual income — and sophisticated investors price through it. (More on this in Post 4.4, sin #5: "buybacks as substitute.")

CROIC and the cash-flow variant

A growing number of Japanese disclosures now feature CROIC (Cash ROIC) alongside ROIC. The motivation is that accrual NOPAT can be flattered by depreciation policy, capitalisation choices, and one-off provisions. Cash-flow-based variants — using CFO or FCF in the numerator — strip those out.

A typical CROIC disclosure:

CROIC = (Operating Cash Flow − Maintenance Capex) / (Total Invested Capital)

Foreign long-only investors, in particular, ask for CROIC because it is harder to game across reporting periods. As a result, MTMs published in 2024–2026 increasingly disclose both ROIC and CROIC, with WACC as the shared hurdle.

How this vocabulary should show up in your disclosure

A best-practice cost-of-capital disclosure — the kind featured in TSE's 55 named good-practice examples — typically contains:

1. An explicit cost-of-equity number, with CAPM inputs shown (rf, β, ERP). Range: 7–9%.
2. An explicit WACC number, with E/V and D/V weights shown. Range: 5–7%.
3. A consolidated ROE and a segment-level ROIC tree.
4. The equity spread (ROE − rE) and the ROIC spread (ROIC − WACC), shown as either a number or a chart.
5. A forward path showing how the spread is expected to evolve over the MTM horizon (typically 3 years), with the underlying assumptions on margin, capital turnover, and balance-sheet structure.

Disclosures that hit all five of these elements rarely end up in the November 2024 "misalignment" booklet. Disclosures that skip elements 1, 2, or 4 — typically because the company has not formally adopted the vocabulary internally — are the most common archetypes flagged.

What this means for IR

1. Make the atlas mandatory internal reading. Every member of the IR, planning, and CFO teams should be able to define each of the eight terms cold and write the formula. The vocabulary gap is the single most common reason a smart Japanese company misses an investor-grade disclosure.
2. Decide and document your cost-of-equity number — defensibly. A defensible Japanese cost-of-equity disclosure in 2025–2026 lands in the 7–9% range with CAPM inputs traceable. If your number is below 6%, an investor will ask you to defend it. If it is below 5%, the TSE has flagged that as a misalignment pattern.
3. Disclose both ROE and segment-level ROIC, with WACC. Corporate-level ROE alone is necessary but not sufficient. Investors increasingly read ROIC trees, and segment-level disclosure has become the post-2023 best-practice norm.
4. Use spreads, not levels, as your headline. "Our ROE is 9%" is less informative than "our equity spread is +1.5 ppt and we target +3 ppt by FY27." The spread is what drives PBR; the level is just a number.
5. Train management to use the words consistently. "Capital efficiency," "cost of capital," and "ROE" are not interchangeable. Inconsistency in earnings-call language is read by sophisticated investors as evidence of internal inconsistency in the framework.

Sources & further reading

Primary - TSE "Key Points and Examples" booklet (Feb 2024, EN PDF): https://www.jpx.co.jp/english/news/1020/u5j7e50000001bqd-att/240201en.pdf - TSE "Key Points" updated edition (late 2025, EN PDF): https://www.jpx.co.jp/english/news/1020/vk0khi000000gi14-att/vk0khi000000gi4d.pdf - TSE November 2024 "Cases Where Companies Are Not Aligned": https://www.jpx.co.jp/english/news/1020/20241121-01.html

Supporting - Hitachi Integrated Report on ROIC management: https://www.hitachi.com/IR-e/library/integrated/2023/ar2023e_14.pdf - Springer chapter "Equity Spread and Value Creation": https://link.springer.com/chapter/10.1007/978-981-10-8503-1_4 - Morgan Stanley "ROIC and the Investment Process": https://www.morganstanley.com/im/publication/insights/articles/article_roicandtheinvestmentprocess.pdf - Dai-ichi Life Research Institute (Feb 2024): https://www.dlri.co.jp/english/report_en/202402YK.html - Marui Group IR (EVA / ROIC disclosure pioneer): https://www.0101maruigroup.co.jp/en/ir/

Cross-references

• Theme 1.1 — Why 8% Was the Number That Changed Japan (Ito Review)
• Theme 4.1 — PBR < 1 Is Not a Target — It's a Verdict
• Theme 4.3 — The Shame-and-Showcase List
• Theme 4.4 — The Seven Sins of Cost-of-Capital Disclosure
• Theme 4.5 — From Disclosure to Implementation: how the April 2026 Update rewrote the rules