Two experts inside Claude and ChatGPT: Canadian customs and federal tax. Method first, the text in the version that governs, the source on every answer — and both official versions, French and English, equally authoritative. Not a search engine: reasoning that holds its conclusion.
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A subscription per connector — and inside it, far more than documentation: the working method of the trade and the technical know-how that applies it, built into the connector. A free trial to start; every answer carries its citations, to the section.
Canadian customs at the entry date: the tariff, the dated measures, valuation, origin, the case.
And it produces: the customs value settled, duties and GST computed, the request for review and the correction drafted — the case worked end to end.
8703.10.00
Customs Act, s. 32.2
The right section, at the right year: the Income Tax Act dated, CRA folios, fiscal federalism and the treaties.
And it produces: the file analyzed, positions computed and sourced, the notice of objection and notice of appeal drafted — to the Court’s standards.
ITA s. 152
Folio S1-F3-C1
Federal law is enacted in both languages, and both are equally authoritative. When they diverge, the shared-meaning rule prevails (R. v. Daoust, 2004 SCC 6): Carter serves both, flags the gap, and leaves the conclusion to the lawyer.
French version
« La personne tenue … de faire une déclaration en détail … et qui a des motifs de croire que la déclaration est inexacte est tenue, dans les quatre-vingt-dix jours suivant la découverte, de corriger la déclaration. »
English version
“A person … who has made a declaration … and who has reason to believe that the declaration is incorrect shall, within ninety days after the reason to believe arises, make a correction to the declaration.”
The deadline — ninety days — is read from the served text, never from memory; and it runs from the “reason to believe”, which both versions express in concert. Every federal provision confronts this way, version against version.
The connector carries the trade’s method and its procedures, not a search box — and the order of dates is real: the text served is the one that governed at the date of the triggering event.
One click from claude.ai or Claude Desktop: the connector arrives prefilled, name and address included. In ChatGPT: same address, under Settings → Connectors.
Search, section reading in its dated version, sourced computation: the answer is built on the texts, not on recollection — and in the language of your choice.
Every claim carries its exact citations: section, version, court, date. The decision stays with the professional.
The connectors run in Claude and ChatGPT; answers gain depth with a capable model — Claude Opus, or GPT-5 Thinking.
The same question, two answers: one rests on a model’s recollection, the other goes back to the text. “Has folio S1-F3-C1 on child care expenses been revised, and which sections of the Act does it cite?”
A model recalling
“It rings familiar as section 63; the folio is probably current. It’s likely fine to rely on.” No citation, no date.
Unverifiable
A model reading
“The folio is served as an administrative position, with its date; it cites section 63 of the Act, served verbatim in its in-force version.” The answer arrives carrying its citations.
A practitioner’s question, the answer in brief, and the citations that let you verify.
“Goods entered in March 2024 under a tariff line since removed: which text computes the duty — today’s, or the line at its date?”
The line is read at its March 2024 vintage — the description and rate of that time — and the gap with the current tariff is flagged, dated and cited, so the two states can be compared.
Citations Tariff, vintaged line March 2024
“Capital gain on property disposed of in 2023: which inclusion rate — the year’s, or today’s?”
The inclusion rate is read at section 38 in its version for the year of disposition, never from memory: the tax law is indexed, a recited figure would be wrong.
Citations ITA s. 38 2023 version
For the full framework: frequently asked questions and legal notice.
From the official corpora carried in the legend: the Customs Tariff and its vintages, the federal Acts and their regulations, the Income Tax Act, CRA folios, advance rulings, treaties and case law. Every answer points to the exact citation, for verification at the source.
Carter is a subscription service (a professional plan), with a free trial to start. During the launch period the connector is open, so the trial needs no card. Pricing will be announced here before billing begins, and adding will stay just as simple.
No: a sourced research aid. The professional verifies the citation given, weighs the situation and decides.
Pick your desk: the connector opens prefilled in Claude — or adds to ChatGPT, same address.
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