Coming soonRelease in early 2027

Knowledge as a Service: the tax law of CH, DE, AT, LI and LU as an API

The legal knowledge space behind Nyteca®: legislation, ordinances, administrative practice and case law from five jurisdictions – Switzerland, Germany, Austria, Liechtenstein and Luxembourg. Structured, versioned and citable. From early 2027 as an interface you connect your own language model to.

Join the waiting list See the comparison

LiveThe same knowledge space powers Nyteca® Chat – already available in Switzerland

›CH · DE · AT · LI · LU
›versioned
›citable
›model-independent

knowledge/queryDraft

POST https://api.nyteca.ch/v1/knowledge/query
Authorization: Bearer <api-key>
Content-Type: application/json

{
  "query": "Deductibility of continuing education costs",
  "jurisdiction": ["CH-BUND", "CH-ZH", "LI"],
  "doc_types": ["law", "ruling", "guidance"],
  "as_of": "2024-12-31",
  "top_k": 8
}

Response

{
  "matches": [
    {
      "text": "Deducted from income are: ... the costs of job-related education and training ...",
      "citation": {
        "act": "DBG",
        "article": "Art. 33 Abs. 1 lit. j",
        "version": "2024-01-01",
        "as_of": "2024-12-31"
      },
      "score": 0.91
    }
  ]
}

Draft interface – field names may still change before the release.

Jurisdictions: CH, DE, AT, LI and LU

Languages: German, French, Italian

~1.5 yrs

Building, cleaning and training the corpus

Operation and hosting in Switzerland

Why it is needed

A language model on its own does not know the law in force

Models guess at citations when they have none. In tax advice that is not an option.

Evidenced, not plausible

Every passage delivered carries its citation: act, article, version and date. What cannot be evidenced is not delivered – invented citations are ruled out by design.

As at a date, not merely current

The law changes. A question about a tax year is answered against the version in force at the time, not against today’s state.

By jurisdiction, not across the board

Five jurisdictions with their levels – in Switzerland, federal and cantonal – plus administrative practice: all kept separate and narrowed down precisely, right down to the individual canton.

Comparison

Broad knowledge or evidenced law

A general language model is a powerful tool – it is simply not built as a source of law. Where it is broad, the knowledge space is deep.

General language model without a specialist knowledge space · Nyteca® Knowledge as a Service CH · DE · AT · LI · LU

Source reference for every statement
General language model
LimitedSupplied when the model runs a search – not guaranteed and not consistent.
Nyteca® Knowledge as a Service
YesEvery passage carries the enactment, article, version and date. No reference, no result.
Protection against invented references
General language model
NoA language model produces text. Non-existent provisions and rulings are a known risk.
Nyteca® Knowledge as a Service
YesOnly what is present in the holdings is delivered. Retrieval does not produce the text, it finds it.
Law as it stood on a given date
General language model
NoAnswers from the state of its training or its search – without a reliable link to the tax year.
Nyteca® Knowledge as a Service
YesA query against a reference date returns the version in force at that time.
Depth in tax and legal matters
General language model
LimitedBroad general knowledge. Strong on wording, thin on specialist questions and fringe areas.
Nyteca® Knowledge as a Service
YesHoldings cut for tax and legal questions instead of general knowledge.
Federal and cantonal level
General language model
LimitedFederal law is mostly present, cantonal law remains patchy.
Nyteca® Knowledge as a Service
YesLevels are kept apart and can be filtered precisely – down to the individual canton.
Administrative practice
General language model
LimitedCirculars, guidelines and information sheets are rarely covered in full.
Nyteca® Knowledge as a Service
YesAdministrative practice is a document type of its own in the holdings and can be addressed individually.
Currency
General language model
LimitedDepends on the provider’s training status.
Nyteca® Knowledge as a Service
YesContinuously maintained holdings; changes create new versions instead of overwriting.
Verifiability for audit and supervision
General language model
NoHow an answer came about can hardly be evidenced after the fact.
Nyteca® Knowledge as a Service
YesEvery passage drawn on is traceable with its version and date.
Choice of language model
General language model
NoModel and provider are fixed.
Nyteca® Knowledge as a Service
YesModel-independent: you connect your own model, also on your own infrastructure.
Handling of your queries
General language model
LimitedGoverned differently depending on provider, plan and setting.
Nyteca® Knowledge as a Service
YesOperated in Switzerland. Your queries do not flow back into training.

For tax and legal questions	General language modelwithout a specialist knowledge space	Nyteca® Knowledge as a ServiceCH · DE · AT · LI · LU
Source reference for every statement	LimitedSupplied when the model runs a search – not guaranteed and not consistent.	YesEvery passage carries the enactment, article, version and date. No reference, no result.
Protection against invented references	NoA language model produces text. Non-existent provisions and rulings are a known risk.	YesOnly what is present in the holdings is delivered. Retrieval does not produce the text, it finds it.
Law as it stood on a given date	NoAnswers from the state of its training or its search – without a reliable link to the tax year.	YesA query against a reference date returns the version in force at that time.
Depth in tax and legal matters	LimitedBroad general knowledge. Strong on wording, thin on specialist questions and fringe areas.	YesHoldings cut for tax and legal questions instead of general knowledge.
Federal and cantonal level	LimitedFederal law is mostly present, cantonal law remains patchy.	YesLevels are kept apart and can be filtered precisely – down to the individual canton.
Administrative practice	LimitedCirculars, guidelines and information sheets are rarely covered in full.	YesAdministrative practice is a document type of its own in the holdings and can be addressed individually.
Currency	LimitedDepends on the provider’s training status.	YesContinuously maintained holdings; changes create new versions instead of overwriting.
Verifiability for audit and supervision	NoHow an answer came about can hardly be evidenced after the fact.	YesEvery passage drawn on is traceable with its version and date.
Choice of language model	NoModel and provider are fixed.	YesModel-independent: you connect your own model, also on your own infrastructure.
Handling of your queries	LimitedGoverned differently depending on provider, plan and setting.	YesOperated in Switzerland. Your queries do not flow back into training.

The comparison refers to general language models without a connected specialist corpus; the feature set and terms of the providers change continuously. The knowledge space delivers evidenced passages – the professional assessment and the responsibility for it remain yours.

Architecture

From the source to the citable passage

Five stages. Not a one-off data set, but a foundation maintained continuously.

1
Preparation
A single unified corpus
Legal texts, administrative practice and rulings are converted into a common format. What arrives in different formats is afterwards available in uniform shape.
2
Structure
Structure instead of running text
The corpus is structured: act, article, paragraph, item. Structure, citation and date stay attached to every passage.
3
Versions
Law over time
Every amendment creates a new version with its date of validity. Earlier versions remain retrievable instead of being overwritten by the current state.
4
Index
Semantic index
Passage-level embeddings in a vector index, multilingual for German, French and Italian. Semantic and term-based search work together.
5
Retrieval
Retrieval with citation
Every hit comes back with act, article, version and date. No verifiable citation, no result.

Coverage

What the knowledge space holds

Separated by jurisdiction, level and document type — from the legal norm through administrative practice to case law.

CHSwitzerlandFederal and cantonal level, in German, French and Italian.

Laws and ordinances: Federal law
Cantonal law
Tax law and international tax law
Administrative practice: Circulars, information sheets and directives
Publications of the tax authorities
Case law: Supreme court rulings
Cantonal courts
Doctrine and commentary: Commentary on key legislation

Nyteca® Chat in this marketLive

DEGermanyFederal level, focused on tax and levy law.

Laws and ordinances: Federal law
Tax and levy law
Administrative practice: Guidelines and decrees of the tax administration
Case law: Decisions of the federal courts
Doctrine and commentary: Commentary on key legislation

Nyteca® Chat in this marketComing soon

ATAustriaFederal level, focused on levy law.

Laws and ordinances: Federal law
Levy and tax law
Administrative practice: Guidelines and decrees of the tax administration
Case law: Decisions of the supreme courts
Bundesfinanzgericht

LILiechtensteinNational law, in German.

Laws and ordinances: National law
Tax and company law
Administrative practice: Information sheets and guides of the tax administration
Case law: Decisions of the national courts

Nyteca® Chat in this marketComing soon

LULuxembourgLaw of the Grand Duchy, in French and German.

Laws and ordinances: Law of the Grand Duchy
Tax law
Administrative practice: Circulars of the tax administration
Case law: Decisions of the administrative and civil courts

Nyteca® Chat in this marketComing soon

Coverage keeps growing. If an area of law is missing for you, we will take it up for review.

Scope

What the interface does

A knowledge space you connect your own model to – without your data becoming part of it.

01Retrieval endpoint: Semantic and term-based search across the entire corpus, filterable by jurisdiction, level, area of law, document type and reference date.
02Connect your own models: The knowledge space is model-independent. You connect your own language model and keep control over what your model answers.
03Citable answers: Every text block carries its citation. What is not documented is not delivered – the basis for verifiable information.
04Point-in-time queries: Queries against a reference date return the version in force at that time. The historical corpus built up over around a year and a half is available for this.
05Change feed: Subscribable notification when a monitored act or area of law changes.
06Operated in Switzerland: Operated by Tax AI AG in Baar. Your queries do not flow back into training.

Who it is for

Who connects to the knowledge space

Software companies

You are building a tax, accounting or legal application and need a dependable legal foundation instead of building and maintaining one yourself.

Firms and legal departments

You run your own model on your own infrastructure and want to put it on verified, citable law.

Authorities and associations

You need answers that can be traced back to the citation – and a Swiss provider with hosting in Switzerland.

Coming soonRelease in early 2027

Be there early

We are opening the interface step by step. On the waiting list you receive the technical documentation in advance, access to the closed test phase and word as soon as your area of law goes live.

Join the waiting listTick “Nyteca® Knowledge” on the form.

Interface documentation before the release
Access to the closed test phase
A say in sources and fields
No cost, cancel at any time

Until then: the same knowledge space in Nyteca® Chat

Nyteca® Chat is already live in Switzerland – with the same legal knowledge space, for tax questions, opinions and objections with citations. The Nyteca® App for the whole firm follows from mid-November 2026.

Open Nyteca® Chat Explore the Nyteca® App

Knowledge as a Service: the tax law of CH, DE, AT, LI and LU as an API

A language model on its own does not know the law in force

Evidenced, not plausible

As at a date, not merely current

By jurisdiction, not across the board

Broad knowledge or evidenced law

Source reference for every statement

Protection against invented references

Law as it stood on a given date

Depth in tax and legal matters

Federal and cantonal level

Administrative practice

Currency

Verifiability for audit and supervision

Choice of language model

Handling of your queries

From the source to the citable passage

A single unified corpus

Structure instead of running text

Law over time

Semantic index

Retrieval with citation

What the knowledge space holds

What the interface does

Who connects to the knowledge space

Software companies

Firms and legal departments

Authorities and associations

Be there early

Until then: the same knowledge space in Nyteca® Chat