Planomy Tax Data

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.

Planomy Tax Data publishes 1 API on the APIs.io network: Tax Data API. Tagged areas include tax, finance, open-data, retirement, and government.

Planomy Tax Data’s developer surface includes support, pricing, signup flow, authentication, and 16 more developer resources.

🌐 Visit website 📡 Source on GitHub
35.8/100 thin ▬ flat Agent 41/100 agent ready Full breakdown ↓
scored 2026-08-12 · rubric v0.11.0
1 APIs 1 MCP Servers
taxfinanceopen-dataretirementgovernmentpersonal-financeirssocial-securitymedicarejson

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-12 · rubric v0.11.0
Composite quality — 35.8/100 · thin
Contract Quality 4.8 / 21
Developer Ergonomics 3.2 / 17
Commercial Clarity 13.0 / 17
Operational Transparency 0.0 / 11
Governance 1.4 / 10
Discoverability 6.5 / 9
Regulatory Posture 6.9 / 15
Agent readiness — 41/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/planomy-tax-data: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Planomy Tax Data Tax Data API

Dated, source-attributed US tax and retirement figures.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

planomy-tax-data-mcp.yml

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Planomy Tax Data Plans Pricing

5 plans

PLANS

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

Planomy Tax Data Index

6 properties

JSON SCHEMA

Planomy Tax Year Dataset

16 properties

JSON SCHEMA

Examples 2

Example request and response payloads for these APIs.

Planomy Tax Data 2026

16 fields

EXAMPLE

Planomy Tax Data Index

6 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Planomy Tax Data Authentication

0 schemes

SECURITY

Planomy Tax Data Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Planomy Tax Data Agentic Access

2 operations

2 operations · 0 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp
SignUp

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conformance
Conformance
 DataModel
DataModel
 Vocabulary
Vocabulary
 Components
Components

Scroll for all 7

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 4

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans

Company 1

The organization behind the API

Website
Website

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
name: Planomy Tax Data
description: '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.'
url: https://planomy-tax-data.apievangelist.com/apis.yml
image: https://planomy.net/og/og-home.png
created: '2026-07-28'
modified: '2026-08-09'
specificationVersion: '0.21'
tags:
- tax
- finance
- open-data
- retirement
- government
- personal-finance
- irs
- social-security
- medicare
- json
apis:
- aid: planomy-tax-data:planomy-tax-data-tax-data-api
  name: Planomy Tax Data Tax Data API
  description: Dated, source-attributed US tax and retirement figures.
  humanURL: https://planomy.net/data/
  baseURL: https://planomy.net
  tags:
  - tax-data
  properties:
  - type: OpenAPI
    url: openapi/planomy-tax-data-tax-data-api-openapi.yml
  - type: Documentation
    url: https://planomy.net/data/
  - type: APIReference
    url: https://planomy.net/data/#schema
  - type: LLMsTxt
    url: https://planomy.net/llms.txt
  - type: JSONSchema
    url: json-schema/planomy-tax-data-tax-year-dataset.json
  - type: JSONSchema
    url: json-schema/planomy-tax-data-index.json
  - type: Examples
    url: examples/planomy-tax-data-2026.json
  - type: Examples
    url: examples/planomy-tax-data-index.json
maintainers:
- FN: Planomy
  email: support@planomy.net
  url: https://planomy.net/data/
generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 90
  at: '2026-07-28T15:14:23.864Z'
common:
- type: Overlay
  url: overlays/planomy-tax-data-overlay.yaml
- type: AgenticAccess
  url: agentic-access/planomy-tax-data-agentic-access.yml
- type: DomainSecurity
  url: security/planomy-tax-data-domain-security.yml
- type: Website
  url: https://planomy.net/
- type: Support
  url: mailto:support@planomy.net
- type: Pricing
  url: https://planomy.net/pricing
- type: SignUp
  url: https://planomy.net/app/
- type: TermsOfService
  url: https://planomy.net/legal/terms
- type: PrivacyPolicy
  url: https://planomy.net/legal/privacy
- type: Authentication
  url: authentication/planomy-tax-data-authentication.yml
- type: Conventions
  url: conventions/planomy-tax-data-conventions.yml
- type: ErrorCatalog
  url: errors/planomy-tax-data-problem-types.yml
- type: Lifecycle
  url: lifecycle/planomy-tax-data-lifecycle.yml
- type: Conformance
  url: conformance/planomy-tax-data-conformance.yml
- type: DataModel
  url: data-model/planomy-tax-data-data-model.yml
- type: Vocabulary
  url: vocabulary/planomy-tax-data-vocabulary.yml
- type: Plans
  url: plans/planomy-tax-data-plans-pricing.yml
- type: Components
  url: components/planomy-tax-data-components.yml
- type: MCPServer
  url: mcp/planomy-tax-data-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-08-09'
  status: enriched
  artifacts_added: 23
  pass: local-v1