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Defensible answers to UK tax questions

Built for tax professionals who value speed, accuracy, and traceability.

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We handle the research. You bring the judgement.

Compress hours of statute hunting into minutes. So your day belongs to the work only you can do.

Accurate answers

Grounded in legislation, HMRC manuals, and guidance. Always up-to-date. Verifiable in one click.

Client intelligence

Profiles, documents, and tax positions centralised securely. AI answers in full client context.

Document analysis

Upload any document – from returns to HMRC notices. Spot issues, identify opportunities, get answers in context.

Document drafting

Draft memos, HMRC correspondence, and client letters in seconds. With citations to hand.

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Tested. Measured. Published.

98%

Accurate

21

Tax domains

2%

Hallucinated

22

Question types

Designed and validated by tax experts.

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The impact of tax research AI

5 hrs

Per week saved by AI adopters

Thomson Reuters

Future of Professionals 2025

21%

Increase in billable hours per adviser

MIT Sloan

Journal of Accounting Research 2026

8.5%

Time shifted to high-value work

MIT Sloan

Journal of Accounting Research 2026

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Security and compliance, built in

UK data storage

Customer data hosted at rest in the UK (AWS London)

Open Documentation

DPA, sub-processor list, security practices. All published and current.

No AI training

Your data never trains any model. Contractually guaranteed.

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From solo practitioners to national firms, and in-house tax teams

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How firms use GAIN Tax

Accountants & tax advisers · 600 clients · North London

“GAIN Tax is going to be as accurate as possible because it’s picking legislation up. It’s not making it up.”
Christos Liondaris

Christos Liondaris

Managing Partner, Liondaris & Co

Using GAIN Tax since October 2025

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