Global Tax Analyzer is EY's tax AI platform tuned to Korean tax law. One question retrieves statutes, authoritative interpretations, tribunal decisions and court cases in real time, answers with the evidence, and turns it into ready-to-use documents — opinion letters and memos.
Tax answers you cannot trace are answers you cannot use. Global Tax Analyzer checks statutory and case citations against official texts, and clearly flags any that remain unresolved — then connects the evidence to ready-to-use documents and EY professional review.
Every question retrieves statutes, authoritative interpretations, tribunal decisions and court cases directly from official data — new amendments and cases apply immediately, with no retraining.
Existence, the article's paragraph and subparagraph, decision dates and quoted excerpts are all checked against the original text. Unconfirmed citations are filtered out, and anything outside automatic lookup is honestly marked as such.
Download opinion letters, memos and response statements in firm templates — and matters that call for judgment are handed on to your EY tax professional.
This isn't a general chatbot with tax bolted on. Global Tax Analyzer was designed and built by practicing EY tax professionals — it finds the actual statutes and cases, and checks every citation against the official source.
Tax practice and verification principles are implemented in code. Core determinations — rates, valuation, risk — are computed by deterministic engines; the AI writes the explanation and the document on top. Plausible-but-wrong answers have nowhere to hide.
Every question triggers a live lookup of official data. Newly amended statutes and fresh case law are reflected instantly — no retraining.
We cross-check every statute and case citation against the official source for two things: whether it actually exists and whether the quoted wording matches the original. We check down to the paragraph and subparagraph — a wrong one is corrected to the right one, and a reference we cannot confirm is never left in the answer; the checking is never handed back to you as homework. A quoted excerpt that differs from the source is fixed to the actual wording or labeled as a gist, so an unverified sentence never looks like a verbatim quote. Decision and judgment dates are also checked against the official source. Citations that remain unconfirmed are flagged with their verification status. Answers never use an internal search tool or storage path as a proxy for reliability; status is described only through the original text, identifier, applicable date, and available text scope. The soundness of interpretation and application, however, is flagged as an expert-review matter — existence checking is never dressed up as a guarantee of correctness.
Enter a tax year or transaction date and the analysis runs under the law in force then — exactly what claims for correction, audit defense and prior-year reviews require.
Organization-scoped access, retention, and no-training rules apply. When a selected external model is used for inference, only the required input is sent under the contractual security configuration; customer-owned cloud and on-premises isolation are also available.
Ask an issue and it synthesizes statutes, rulings, interpretations, tribunal and court decisions — with a confidence level, and a review-required flag for high-risk matters.
Turn research into opinion letters, memos, emails and briefs — export to PDF · Word · Hangul (HWP), or into your own corporate template.
A table shows which sentence of which source each judgment rests on. Every basis leads with its type ( statute · interpretation · precedent) and a plain-language read, so you can follow the reasoning without any tax expertise. Tap a number to open the source.
Attach contracts or internal memos in PDF, Word, HWP, HWPX or text and the review reflects your facts. The original file is not retained; extracted text and its search index are used only for that review, automatically deleted within one week, and never used for model training.
When a matter needs human judgment beyond AI review, it hands off smoothly to the responsible EY tax professional.
Interface and deliverables in both Korean and English — ready for global reporting and cross-border work.
Beyond the general research chat, dedicated agents are built for recurring tax workflows. Agent availability and feature scope are provided selectively by contract and plan, and some agents are for EY internal use only — certain features such as diagnostics provide summary-level results, with in-depth review delivered through EY professional engagements.
The full body of national and local tax legislation is kept available, so statutory lookups don't stop even during an external outage.
Citations that can't be auto-verified are never silently deleted — they're flagged "verify directly." We never conclude something "doesn't exist" just because our search didn't find it — no official database has complete case-law or ruling coverage, so rather than deleting a real citation and breaking trust, we mark it "outside automatic lookup" and point you to the source. A confidence level is stated too.
Access control, concurrent-session management and audit logging are built in; models range from the in-house engine to frontier LLMs by contract. Models, usage limits, incident alerts and privacy controls are changed through a role-gated admin control plane with an audit trail.
The order in which evidence is found is part of accuracy. When a case or ruling number and date are supplied, the platform resolves that exact source first; spaces, hyphens, and Unicode dashes are normalized as the same identifier. It then expands from the source's legal issue, while low-relevance evidence is never kept merely to fill a quota. It also checks the latest Supreme Court precedent that actually cites the key Article and scans for later change or overruling signals. Conclusions follow the law applicable at the transaction date → authority hierarchy → recency among evidence of the same authority and issue; changes from earlier positions are disclosed, not hidden.
Just ask. From "repudiation of wrongful calculation on a low-price transfer to a related party" to contract review and unlisted-stock valuation — one line of question comes back as evidence and a document.
Tax law changes often, and a court decision interprets the law as it stood at the time. So before ranking authorities, the platform first confirms which statute version applies to your taxable year and whether it has since been amended.
Statutes, cases and rulings are fetched live from official sources, and the latest or hard-to-find materials are supplemented from our own accumulated corpus. Citations from both paths are checked against the original text before they appear.
We verify which statute version a precedent or ruling interpreted; if the law has since changed, it is not used as direct authority for today's conclusion. Older materials are kept — clearly marked as prior doctrine and amendment background — rather than deleted.
Court reasoning and current administrative practice can diverge. We present both sides rather than one, and explain the practical burden this can create at filing or appeal.
Sources that cannot be verified carry their verification status and limits, stated as such. Where useful, we point to official advance-ruling procedures (NTS advance answers, written inquiries) or expert review — reducing uncertainty before you act.
Usage is managed transparently in credits. The in-house tax engine runs without limits; premium models are chosen only when you need more power. Scale and rates are configured to fit each contract.
Research and review on EY's dedicated GTA engine come with a generous allowance included in your plan. The scope of inclusion is configured per contract.
For matters that call for deeper reasoning, you can select a frontier model. Only premium usage is metered in credits — you pay for what you use.
Administrators assign seats, credit limits, and model access per organization and member, with usage visible transparently on a dashboard.
Scope, model mix, and rates are designed around the size and needs of your division or entity. Enterprise agreements and dedicated-model integration are supported.
Cost is governed through concurrency, queueing, and limits — we never shorten output to save cost. Even long review memos are completed end to end.
Uploaded materials and conversations are separated by organization-scoped access and retention policy and are not used to train models. Contract terms govern external-model processing; dedicated-cloud or on-premises isolated deployment is available.