Syntax AI

No one is 100% confident on their tax return... until now

Quick Pitch
February 18, 2025

The UK's 71,500 accounting firms serve 5 million SMEs and 12 million individuals. Growing tax complexity is leading to billions in both missed revenue opportunities and mounting professional liability risks - the risk of getting it wrong has never been higher.

This startup is solving two key problems:

Proactively detects tax compliance errors before HMRC submission, protecting firms from £10.7bn in liability risk.
Uncovers missed tax planning opportunities, enabling firms to generate £1.5bn in additional revenue without increasing resources.

SynTax is the AI platform that helps accountants spot compliance errors before they are submitted to HMRC and identify high-value tax planning opportunities.

Headquarters: London
Employee count: 3
Investors: Notable lead angel (serial entrepreneur with £1.7bn exits since 1997)
Funding amount: £125,000 committed, raising £750,000 (£250k SEIS & £500K EIS). Register for terms using the poll at the bottom of this email.
Business model: B2B SaaS (Agentic)
Traction metrics:
- Revenue generating pilot: identified £3.6m in potential tax relief across 5,486 clients
- Waitlist of 1,127 accounting firms (including 10% of the UK’s Top 100 firms)
- Go-to-Market partnership with CCH worth £1.5m ARR (at 10% conversion)

APPEALS

Unique and defensible tech: Proprietary tax Domain-Specific Language (DSL), AI/ML-augmented rule engine, data flywheel and knowledge moat, API-first architecture for seamless integrations.
Democratising advanced tax tech for general accountants: 71,500 general practice accountants in the UK, Syntax levels the playing field by bringing enterprise-grade AI to the mass market.
Complementary to tax assessment apps (e.g. Pie Tax): White-label ready - Self-assessment apps can upsell tax return checks via Syntax. Peace of mind for customers and additional revenue stream for partners.

POTENTIAL RISKS

Data accuracy & bias: AI models depend on high-quality training data, and like any system, inaccurate inputs could lead to suboptimal outputs.
Cybersecurity & data privacy: Handling sensitive tax data requires stringent security measures to prevent breaches and comply with regulations like GDPR.
Accountant Resistance: Some accountants may initially be sceptical of AI-driven tax solutions, preferring traditional approaches.

Express interest using the poll at the bottom of this email to receive the mitigations for these risks.

TaxTorch, Disgnostax and 2020 Innovation
- Syntax AI the first externally available tax review automation software in the UK, combining structured tax rules with AI/ML-powered reasoning to deliver certainty and instant API access to tax expertise.

CEO and Co-Founder, Nick Stobbs: Career exclusively in corporate tax, founder Vequity Intelligence in 2011 (successfully exited in 2016).
CTO and Co-Founder, Jacob Busfield: Led technology teams at multiple successful startups (Simomics and So Energy), scaling AI and SaaS systems from inception to over a million users.
Architect and Co-Founder, Dr. Andrew Turner: Renowned Machine Learning researcher and practitioner having developed innovative algorithms and systems across diverse domains at Simomics and So Energy.

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Written by Luke & Seb