AI tax research with official citations
Official tax law and guidance, collected from the publishers and kept current.
Open a marker to read the passage the claim rests on.
- Personal allowance is £12,570
- Basic rate band is £37,700 at 20%
- Higher rate applies above the basic rate band
- Total tax is £11,432calculator
What it does
Section-level citation
Verification rejects a topical-only citation. A claim is supported by the section it rests on, or it does not ship.
Every legal claim cites a specific section of a real official document.
Authority precedence
Statute outranks regulation, which outranks guidance. Where sources conflict, the answer surfaces the conflict.
Statute outranks guidance — and we show you when sources conflict.
Released like software
Import, validate, promote, index, roll back. A bad source version physically cannot become the active one.
Every answer records the sources it used, so it can be checked and reproduced later.
Open any claim and read the passage behind it.
The citation is not a bibliography entry. Each marker opens the section the claim was built from, with the authority that published it.
Every legal claim cites a specific section of a real official document.
Open a marker to read the passage the claim rests on.
- Personal allowance is £12,570
- Basic rate band is £37,700 at 20%
- Higher rate applies above the basic rate band
- Total tax is £11,432calculator
A high-risk question with no citation is refused.
The grounding check cannot be bypassed. A question that matters, with no source to stand on, does not get an answer that sounds like one.
A high-risk question with no citation to stand on is refused.
What inheritance tax is due on an estate of £1.2m with a family home and two prior gifts?
Exact inheritance tax liability is outside the calculator's declared scope. Only top-rate reference answers are available.
Routed to a qualified adviser, with the question and the reason attached.
The engineering detail
- Professional topics indexed
- 16
- Countries with official sources
- 128Registry scope. Calculator scope is a different, smaller number.
- Reproducible
- Sources and calculator version recorded
Related
Tax calculation engine
Exact tax calculators built on the official rates for each tax year, with a law-as-of date on every figure and the assumptions behind each result shown.
Cases and workpapers
Case and workpaper workflow for firms: nine standard folders, an enforced reviewer gate, and a finalised pack that is immutable once it is signed off.
Audit proofs and ledger integrity
Monthly signed audit proofs, a hash-chained ledger with a validator for the whole chain, five anomaly types detected, and a read-only auditor role.
Find out whether your jurisdictions are covered.
Coverage decides whether anything else on this site is worth your time, and it is published per country including the gaps. Ten minutes there can save you a call.
Decision support, not tax advice. A professional reviews before anything is filed.