# Taxley (UK Corporation Tax API)

**Canonical:** https://apis.io/providers/taxley/  
**Website:** https://taxley.co.uk  
**APIs profiled:** 1

Taxley provides free UK Corporation Tax calculators and a public JSON API for developers and AI assistants. It offers tools to compute corporation tax, deadlines, penalties, and related calculations without requiring an API key. Results link back to Taxley’s website for verification. The service is operated by Taxley UK LLP, a UK‑registered limited liability partnership, and integrates with HMRC filing processes.

## Kin Score — 35.4 / 100 (thin)

Scored 2026-11-06 under rubric 0.27.0. Trend: falling (-7.3 from 42.7).

| Facet | Score |
|---|---|
| Discoverability | 59.2 |
| Contract Quality | 55.5 |
| Contract Governance | 22.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 7.1 |
| Access Clarity | 53.9 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 20.6 (matched via fallback).

## Agent readiness — 33.3 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | verified |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | distinct |
| MCP Tool Quality | full |

## Access

Paid — onboarding: unknown, pricing: paid, trial: no (confidence: low).

## APIs (2)

- **Taxley API** — Taxley provides free UK corporation tax calculators via a public JSON API.
- **Taxley (UK Corporation Tax API) Tools API** — The Tools API from Taxley (UK Corporation Tax API) — 18 operation(s) for tools.

## MCP servers (1)

- **Taxley (UK Corporation Tax API) MCP Server** — Remote MCP server at taxley.co.uk.

## Agentic access (1)

- **Taxley Agentic Access** — 35 operations · 17 acting

## Security (2)

- **Taxley Domain Security** — TLSv1.3 · HSTS · DMARC
- **Taxley Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Taxley Plans Pricing**

## Tags

Company, Tax, United Kingdom, Finance

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/taxley/). Scores are computed from the provider's own public artifacts under a published rubric.