# Planomy Tax Data

**Canonical:** https://apis.io/providers/planomy-tax-data/  
**Website:** https://planomy.net/  
**APIs profiled:** 1

A free, keyless open-data JSON API publishing the 2026 US retirement and tax figures that drive the Planomy local-first personal-finance planner: federal income-tax brackets and the standard deduction, FICA rates and the Social Security wage base, the COLA and retirement earnings test, Medicare Part A/B/D premiums and deductibles with the full IRMAA tier tables, contribution limits for employer plans, IRA, SIMPLE, HSA, HDHP and health FSA, Roth and traditional-IRA phase-outs, Saver's Credit thresholds, RMD applicable ages, and a set of state income-tax presets. Two static JSON endpoints — a year manifest and one document per tax year — served from a Cloudflare CDN with no key, no sign-up and no quota. Its distinguishing feature is provenance: every section carries a source key that resolves to a named IRS, SSA, CMS or Federal Register document with the date it was last verified, so any single figure can be cited back to the government publication it came from.

## Kin Score — 35.8 / 100 (thin)

Scored 2026-08-12 under rubric 0.11.0. Trend: flat (+0.0 from 35.8).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 22.6 |
| Governance | 14.1 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 19.0 |
| Commercial Clarity | 76.3 |

Regulatory layer — **Government & Public Sector**: 46.3 (matched via tags).

## Agent readiness — 41.2 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| MCP Server | derived |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | verified |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## APIs (1)

- **Planomy Tax Data Tax Data API** — Dated, source-attributed US tax and retirement figures.

## MCP servers (1)

- **planomy-tax-data-mcp.yml**

## Agentic access (1)

- **Planomy Tax Data Agentic Access** — 2 operations

## Security (2)

- **Planomy Tax Data Authentication** — 0 schemes
- **Planomy Tax Data Domain Security** — TLSv1.3 · HSTS

## Plans (1)

- **Planomy Tax Data Plans Pricing**

## Tags

tax, finance, open-data, retirement, government, personal-finance, irs, social-security, medicare, json

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