UK tax research.
Answers you can verify.
Get tax answers in seconds, with direct links to HMRC guidance, legislation and case law.
If Fiscari can't substantiate an answer, it won't guess.
Questions about Fiscari
Does Fiscari cite HMRC manuals, legislation and case law?
Yes. Every answer cites the sources it rests on: UK legislation, HMRC manuals, VAT notices, Revenue & Customs Briefs, tribunal decisions and GOV.UK guidance. Each citation names the source and section, with a link, next to the claim it supports. Fiscari searches only those UK government sources, not the open web. See how Fiscari finds and cites its sources and worked answers cited to the source.
What does Fiscari do when it can't cite a source?
It says so and declines to answer, rather than guess. Through the API, a refused question is not billed: see the Fiscari API page.
Is there a free tier for Fiscari?
Yes. You can create a free account and try Fiscari on your own client questions. No credit card is needed. Create a free account. Current plans and limits are on the Fiscari pricing section.
Is there a Fiscari API?
Yes. It is a REST API that returns JSON, with structured citations in every response and a streaming option. Developers can try it free for 50 queries over 30 days, with no credit card. After that it is charged by usage, and a question Fiscari refuses for lack of an official source is not billed. See the Fiscari API page and the API documentation.
How much does Fiscari cost?
Fiscari is licensed per user: an Individual licence for solo practitioners and a Firm licence for practices. Current prices are on the Fiscari pricing section.
Generic AI creates liability, not clarity
ChatGPT and similar tools generate confident answers with no verifiable sources
Answers you can't stand behind
No connection to authoritative sources. Answers may be plausible but legally incorrect.
Try citing a ChatGPT response to a client
Citations are vague, incomplete, or entirely fabricated — impossible to verify.
Fabricated authorities — now a profession-wide problem
Early tribunal cases — Harber, Zzaman, Gunnarsson — involved self-representing taxpayers. The profession could once distance itself from that.
In June 2025 that changed. The High Court handed down a combined judgement in Ayinde v London Borough of Haringey and Al-Haroun v Qatar National Bank [2025] EWHC 1383. In Ayinde, a barrister had cited five fake cases. In Al-Haroun, a solicitor submitted 45 citations in support of an £89 million claim — 18 did not exist.
Unusable for professional advice
Cannot be used for professional advice, compliance, or audit defence.
As a practising accountant, I've found Fiscari genuinely useful — particularly for more complex tax planning areas like group relief where the HMRC guidance isn't always easy to navigate. The answers are clearly structured and backed by real citations I can check. It's the kind of support you'd normally pay a telephone tax advisor for, or spend half a morning finding yourself. This has enabled me to provide more value and better offerings to my clients.
Roman Burgess
Accountant, Calm Accounts
Built on UK law.
Not the open web.
HMRC manuals, UK legislation, VAT notices, tax tribunal decisions and official GOV.UK guidance — 100,000+ sections
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Searches across 100,000+ sections in millisecondsPrimary legislation, HMRC manuals, VAT notices, Revenue & Customs Briefs, and official government publications only.
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Full citations with every response
Complete source references with section numbers, URLs, and relevance context for every claim.
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Declines when it can't cite a source
Won't answer without a verified UK government source — and won't charge you for it.
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Refuses to answer without a citable source
If Fiscari can't cite an authoritative UK government source for your question, it says so — and doesn't charge for the refusal.
What is the VAT treatment for exported goods to EU countries post-Brexit?
Exports of goods from the UK to EU countries are zero-rated for VAT under the Value Added Tax Act 1994, Group 1, Schedule 8, provided the goods are exported within the required time limits.
Businesses must retain valid evidence of export to support zero-rating, as set out in VAT Notice 703. Acceptable evidence includes official customs documentation and commercial transport documents.
Following the UK's exit from the EU, goods sent to EU member states are treated as exports rather than intra-community supplies, applying the same zero-rating rules as any other international export.
VAT Notice 703: Exports and removals of goods from the UK
HMRC guidance on export evidence requirements
gov.uk/hmrcCited or silent.
Fiscari refuses to answer rather than guess. If it can't locate and cite an authoritative UK government source, it tells you — every answer it does give is verifiable, traceable, and defensible.
How our source retrieval works →Not another chatbot
Built for professional use, not consumer conversation
| Feature | Generic AI | Fiscari by Glasscubes |
|---|---|---|
| Source grounding | Open web training | UK legislation, HMRC manuals & tribunal case law |
| Full citations | Vague or missing | Every response |
| Refuses without a source | Unverifiable outputs | Refuses if it can't cite |
| Verifiable answers | Cannot verify | Full source URLs |
| Source currency | Training data often 1–2 years old | Corpus updated every week |
| Professional use | Not defensible | Defensible for client work |
How we compare
There are options — here's where we differ.
What is it grounded in?
Legislation, HMRC manuals and tribunal decisions — the sources you would cite to HMRC. The incumbents ground in their own paid commentary.
What happens when it can't answer?
A published refusal policy, not a disclaimer. If the sources don't support an answer, you get told what we found instead.
What does it cost?
Published from £19.50 per user / month. Tolley and Croner-i are quote-on-request, so you commit before you can compare.
Can I try it first?
Yes — start on real client questions without a sales call or an annual contract.
Whether you're advising clients or building software
Purpose-built for UK tax professionals and the developers who serve them
For Accountants
Get citation-backed answers for client queries. Research complex scenarios. Verify compliance positions with confidence.
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Research client tax positions instantly
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Verify interpretations with primary sources
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Export answers with full citations
For Developers
Integrate authoritative UK tax intelligence into your SaaS or fintech platform via clean, structured API.
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RESTful API with JSON responses
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Structured citations in every response
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Rate limiting and usage analytics
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Comprehensive API documentation
{
"query": "Can I recover VAT on a car?",
"confidence": "high",
"grounded": true,
"answer": "Generally no — the blocking order in the VAT (Input Tax) Order 1992 applies to qualifying cars...",
"citations": [
{
"id": 1,
"source": "VAT Notice 700/64",
"authority": "HMRC",
"url": "https://gov.uk/guidance/vat-on-motoring-expenses"
}
]
}Questions accountants are already asking
From compliance to planning — built for real tax work
"What is the wasting asset exemption for CGT, and how does it apply to a lease assignment with 45 years remaining?"
"How do I calculate a gain or loss on a disposal of cryptocurrency where the same coin was acquired in multiple tranches at different prices?"
"When does a member of an LLP fall within the salaried member rules, and what is the effect on the LLP's employer NIC position?"
"What is an associated company for corporation tax purposes, and how does common control through a discretionary trust affect the analysis?"
"How does the residence nil rate band taper apply where the deceased's net estate exceeds £2 million, and can the unused amount transfer on second death?"
"When does the transfer of a going concern exemption apply to a commercial property acquisition, and what conditions must both parties satisfy?"
See how it answers: worked UK tax answers, cited to the source
Simple, transparent pricing.
Individual licence for solo practitioners, or firm-wide for practices.
A deep answer searches the widest set of sources and reasons at length over them. A quick answer consults fewer documents, goes into less depth and comes back faster. Both cite every statement to the legislation, HMRC manual or judgment it came from — the difference is thoroughness, never provenance.
Individual Licence
For solo practitioners and researchers.
Billed annually.
- Access for one user
- 100 deep answers a month
- Unlimited quick answers, subject to fair use
- Full access to Fiscari's accounting, tax and compliance research resources
Firm Licence
For practices who want firm-wide research consistency and oversight.
Billed annually. Volume discount applied automatically as you add users.
- Minimum 3 user licences
- 200 deep answers per user a month, pooled across the firm
- Unlimited quick answers, subject to fair use
- Admin control over user licences and permissions
- Complete audit trail of query history across the firm
- Centralised management and oversight of platform usage
Designed for firms that want to standardise technical research, support knowledge sharing, maintain visibility of queries raised by team members, and ensure consistent advice across the practice.
Defensible answers.
Grounded in authority.
Start getting citation-backed UK tax answers in seconds
Compare Fiscari
Head-to-head against the tools UK accountants weigh it against.