Supreme Operating System → Vertical #14 — accounts.law
Vertical #14 of 15
Pre-Build · Q2 2027 Launch

accounts.law

AI statutory accounts (FRS 105 / FRS 102) · CT600 Corporation Tax · Companies House iXBRL filing · India QA review
4.8m
UK companies must file
2.9m+
Micro-entity eligible
76%
OS reuse
£712k
Y1 ARR target
102×
Return multiple

The play in one line

AI prepares annual statutory accounts and CT600 returns for UK limited companies at a fraction of traditional accountant cost. Micro-entity first (April 2025 threshold raise added ~400k new eligible companies). form.law is the zero-CAC acquisition engine — every new company needs first accounts within 9 months. Undercutting Iris/CCH by 60–80% on the accountant white-label tier.

Strategy & specification
Context

CLAUDE.md

Session context — market, products, rules, cross-references. Read first in any Claude session.

Strategy

Strategy

Full thesis · market sizing · FRS 105 April 2025 threshold change · accountant channel · competitive moat

Architecture

Tech Reuse Blueprint

76% OS reuse proof · snap-tool mapping · £7,000 build cost breakdown · 102× return multiple

Product

Product Spec

User journeys · feature matrix · FRS 105 vs FRS 102 · accountant white-label tier · pricing logic

Technical

Developer Spec

Full API spec · database schema · CT calculation engine · iXBRL tagging · security architecture

Execution

Build Plan

6-week sprint · task grid · CH + HMRC credential procurement timeline · risk register

Marketing

Landing Page

Consumer-facing marketing site · April 2025 urgency bar · FRS 105 vs FRS 102 type cards · pricing

Handoff

Developer Pack

Complete developer handoff · file inventory · onboarding checklist · CT rate test cases · env vars

Runtime (n8n workflows)
Runtime (document templates)
Runtime (deployment)
🐳Dockerfile — Node 20 Alpine + Chromium (Puppeteer iXBRL)Done
🚂railway.json — eu-west, 2 replicas prodDone
🔑.env.example — CH + HMRC + Stripe + Resend + DocuSignKey
Cross-references
form.law — zero-CAC acquisition (every new company needs first accounts in 9 months)
sole.tax — bookkeeping engine provides the ledger
Supreme Capital — tax bill finance cross-sell
rnd.law — R&D-active companies referred
India QA — every set of accounts reviewed before filing