Scenario: a foreign group’s board asks the blunt question: «In this ISDS case against Vietnam, what are our chances?» No serious lawyer answers with a gut-feel number. The odds are built from five stacked layers of analysis — and if one layer collapses, the whole case collapses with it, however perfect the other four. This article presents that assessment framework: jurisdiction, protection standards, State defences, quantum, and case economics.
Layers 1–2: The jurisdictional gate and the breached standard
Layer 1 — Can the case pass the jurisdictional gate? The tribunal hears the case only if: the investor holds a nationality covered by the treaty (checking also the denial of benefits clause against «mailbox» companies); the asset qualifies as an «investment» under the treaty; the claim is filed within the limitation period; and preconditions are met (06-month cooling-off, domestic-procedure requirements if any). This layer is binary: pass or die — and it is where many famous ISDS cases collapsed before anyone discussed right and wrong.
Layer 2 — Which protection standard was actually breached? The usual candidates: indirect expropriation (State measures destroying investment value without formal taking — tribunals balancing investor impact against the State’s police powers to regulate for public purposes); fair and equitable treatment (FET) — tied to legitimate expectations, transparency, and non-arbitrary, non-discriminatory conduct; full protection and security; and MFN/national-treatment clauses. Each standard is its own evidentiary test: a feeling of «being treated badly» is not an FET breach until proven through specific documents, decisions and conduct of State organs.
Layers 3–4: The State’s defences and the money question
Layer 3 — How will the State parry? An honest assessment drafts the opponent’s strongest defence too: treaty exceptions and security clauses; the argument that the measure was a lawful public-purpose, non-discriminatory, due-process regulation (the three legs of lawful expropriation/regulation); the investor’s own wrongdoing (breaches of host-State law — both a defensive shield and counterclaim material, as analysed in the counterclaim article); and causation problems — was the loss truly caused by the measure, or by the market and the project’s own weak management?
Layer 4 — If you win, how much real money? Winning liability but losing the number is ISDS’s commonest script. Quantum pits two approaches against each other: the investment’s fair market value (often via discounted cash flow — DCF — which tribunals scrutinise hard where a project lacks a stable profit record) and sunk costs, safer but far lower. Tribunals also deduct the investor’s contributory fault, pick valuation dates favouring one side or the other, and decide interest and compounding — each choice swings the final figure by tens of percent. A credible prospects assessment outputs a risk-discounted expected-value range, not a «maximum claimable» number that flatters the report.
Layer 5: Case economics and the go/no-go decision
- Costs and time: a typical ISDS case runs 3–5 years, with each side’s legal and expert costs easily reaching seven figures in dollars; the loser usually bears most costs — making «winning» and «not losing money» two different questions;
- Third-party funding: can shift cost risk to a funder for a share of recovery — some new rules (such as VIAC 2026 for commercial arbitration) tighten funding disclosure; at ISDS level, funding also shapes settlement dynamics;
- Enforceability of the award: where does a win get collected (see the ISDS enforcement article) — the State’s commercial assets in which countries, and how likely is a post-award payment agreement;
- Non-monetary value: many ISDS cases truly «win» at the negotiation table: the claim is leverage for a settlement (licence restored, obligations restructured) worth more than compensation arriving years later.
The final product of a serious assessment is a decision matrix: layer-by-layer probabilities multiplied into an overall prospect, an expected-recovery range, matching costs and timelines — and a clear recommendation in one of three groups: file, negotiate with the claim as leverage, or stop and use another channel. Anyone promising a «certain win» in ISDS is selling, not advising.
Frequently asked questions
What layers does an ISDS prospects assessment have?
Five layers: (1) jurisdiction — nationality, investment definition, limitation, preconditions such as cooling-off; (2) the breached protection standard — indirect expropriation, FET…; (3) State defences — public purpose, investor’s own faults; (4) quantum and realistic recovery; (5) case economics — costs, time, funding and enforceability.
Which breach is easiest to prove in ISDS?
No standard is absolutely «easy», but direct expropriation without compensation has the clearest test. Indirect expropriation and FET are heavily evidence-dependent: legitimate expectations must anchor to specific State commitments, and tribunals always balance against the State’s right to regulate for public purposes.
If an ISDS case is won, how is compensation calculated?
Usually the fair market value of the affected investment (often via DCF where the project has a reliable profit history), or invested costs where DCF cannot stand; plus interest to payment date, minus the investor’s contributory fault. Awarded figures are commonly far below the amount originally claimed.
What does pursuing an ISDS case cost, and who pays?
A typical case runs 3–5 years with each side’s legal, expert and arbitration costs potentially reaching seven figures in dollars. The tribunal allocates costs; the loser usually bears most. Third-party funding is an early-to-consider option for shifting cost risk.
This article has been quality-reviewed by the FLAW AI Legal Council
