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200% YoY Growth: How Lean Startup TaxWorld Scaled Rapidly with AI

“CustomGPT.ai let us punch far above our weight. With almost no engineering budget, we built an assistant that now answers tens of thousands of complex tax questions and fuels our revenue growth every month.”
Alan Moore
Alan Moore
Founder & CEO, TaxWorld

97.5%

queries handled successfully

200%

YoY revenue growth

500+

hours per week saved

Summary

As a lean startup, TaxWorld set out with a bold mission: to make accurate, trusted tax guidance accessible to small accounting firms. To achieve this, they built Ezylia—an expert AI tax assistant. With a lean budget and zero internal engineers, TaxWorld rapidly and affordably developed their AI solution, using CustomGPT.ai’s plug-and-play platform. Today, Ezylia handles over 2,000 tax queries per day with 98% accuracy. This intelligent assistant helped TaxWorld double its annual recurring revenue to close to €1m in 24 months. Now, they are rapidly expanding into the UK and US markets.

Industry

Legal Services

Use Case

Customer Engagement

Teams

Cross-Functional

About TaxWorld

TaxWorld is a fast-growing fintech company that builds AI-powered research tools tailored for small and mid-sized accounting practices. Operating primarily across Ireland and the UK, TaxWorld provides firms with fewer than ten employees access to the depth and precision of national tax authorities—without the associated cost or complexity.

With a lean team and strong domain expertise, the company have built a reputation for trust, accuracy, and usability in the legal-tech space. By offering an affordable, intuitive platform, TaxWorld positions themselves as the accessible alternative to heavyweight incumbents, helping smaller firms punch above their weight in a rapidly evolving regulatory landscape.

Challenge

Accountants at small firms were drowning in dense legislation, guidance, and case law. Existing solutions—like Tolley in the UK—served larger firms but were unaffordable and cumbersome for smaller practices.

Key Pain Points:

  • Time-intensive research cutting into billable hours
  • Inconsistent quality across sources
  • No scalable way to deliver instant, accurate tax answers

Root Cause:

Lack of affordable tools with built-in domain knowledge. Market incumbents catered only to top-tier firms, leaving small practices behind. Generalist AI models do not have the depth and precision of TaxWorld’s knowledgebase.

Solution

Strategic Fit: CustomGPT.ai’s no-code platform aligned perfectly with TaxWorld’s lean strategy, allowing them to deploy an expert AI assistant—Ezylia—within days, without technical staff.

Implementation:

  • Bot Development: Ezylia was rapidly connected to thousands of legislative documents, tribunal decisions, and case law, thanks to CustomGPT.ai’s 100 1-click data integrations and support for 1,400 file types.
  • Data Strategy: Leveraged CustomGPT.ai’s RAG and top-performing accuracy architecture for real-time, citation-backed answers.
  • Interface & Persona: CustomGPT.ai’s no-code tools let TaxWorld quickly launch a friendly, on-brand assistant, seamlessly integrated into their redesigned site.
  • Scalability: As TaxWorld expands its customer base and legal catalogue, CustomGPT.ai’s reliable infrastructure scales seamlessly with them.

Results

  1. Queries Handled:
    • 189,351 total → 184,690 answered by AI (97.5 % success)
    • 97.5% queries handled successfully 
  2. Speed:
    • Instant citations replace hours of manual research
    • Instant replies (letters/emails) to client queries
  3. ARR Growth: 
    • Doubling YOY 200% Growth YoY
  4. User Base:
    • 740 paying subscribers, only eight cancellations since launch
  5. Engagement:
    • Ezylia answers  2,000+ questions daily, and rising
    • TaxWorld is not just AI – they have a “human” members Q&A area and answers obtained in the forum are automatically added to Ezylia’s brain for future reference.

Why It Worked

  • Founder-led Deployment: Non-technical platform enabled rapid testing and refinement for fast time-to-value.
  • No-code Simplicity: Allowed non-engineers to scale with confidence.
  • Trusted AI with Citations: Answers generated directly from the source material with citations attached build trust with accountants who cannot tolerate hallucinations.
  • Data Security: Maintained control of proprietary legal data, no data training or leakage.
  • Scalable Infrastructure: Ready-to-go solution with reliable, scalable infrastructure already in place.

Conclusion

TaxWorld proves that a lean startup can deliver enterprise-grade intelligence with the right AI partner. With Ezylia at its core and CustomGPT.ai as its platform, TaxWorld is expanding across borders and redefining what small firms can expect from tax AI.

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