Column Tax

Column Tax is an IRS-authorized, API-first tax filing platform that lets banks, brokerages, neobanks, and SMB/freelancer fintech apps embed a full white-label income-tax preparation and e-file experience directly inside their own product. Partners create a Column Tax user via a server-side REST call, receive a short-lived authenticated URL, and launch the Column Tax UI (web loader or native iOS, Android, and React Native SDKs) embedded in their app, while webhooks report each user through the filing lifecycle. Column Tax offers DIY Filing and Expert Review products, is a SOC 2-certified and IRS-authorized e-file provider, and reports outcomes such as higher retention and direct-deposit switching for embedded partners.

Column Tax publishes 1 API on the APIs.io network. Tagged areas include Company, Fintech, Tax, Tax Filing, and Embedded Finance.

The Column Tax catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Column Tax’s developer surface includes documentation, API reference, getting-started guide, quickstart, authentication, support, engineering blog, and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub

39.8/100 developing ▬ flat Agent 33/100 agent aware Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessSelf serve

1 APIs 1 MCP Servers

CompanyFintechTaxTax FilingEmbedded FinanceE-FileFinancial-ServicesBankingAPI-First

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 39.8/100 · developing

Contract Quality 9.6 / 21

Developer Ergonomics 7.9 / 17

Access Clarity 4.9 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.9 / 10

Discoverability 6.5 / 9

Regulatory Posture 7.0 / 15

Agent readiness — 33/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 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 Banking & Open Finance 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/column-tax: 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.

Column Tax API

REST API to embed IRS-authorized income-tax preparation and e-filing. Create a Column Tax user, obtain a short-lived authenticated URL to launch the embedded filing UI, list a u...

MCP Servers 1

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

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

Quickstart

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

Webhooks

DataModel

Components

Scroll for all 7

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity

Authentication

Authentication

Compliance

Operate 2

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: column-tax
name: Column Tax
description: Column Tax is an IRS-authorized, API-first tax filing platform that lets banks, brokerages, neobanks, and SMB/freelancer
  fintech apps embed a full white-label income-tax preparation and e-file experience directly inside their own product. Partners
  create a Column Tax user via a server-side REST call, receive a short-lived authenticated URL, and launch the Column Tax
  UI (web loader or native iOS, Android, and React Native SDKs) embedded in their app, while webhooks report each user through
  the filing lifecycle. Column Tax offers DIY Filing and Expert Review products, is a SOC 2-certified and IRS-authorized e-file
  provider, and reports outcomes such as higher retention and direct-deposit switching for embedded partners.
url: https://raw.githubusercontent.com/api-evangelist/column-tax/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://cdn.prod.website-files.com/6262ffa3aeadc15ee876298b/627bf917c708fc0ec6460fcb_Text_Image.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- bain-capital-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Fintech
- Tax
- Tax Filing
- Embedded Finance
- E-File
- Financial-Services
- Banking
- API-First
tags_raw:
- Company
- Fintech
- Tax
- Tax Filing
- Embedded Finance
- E-File
- Financial Services
- Banking
- API First
apis:
- name: Column Tax API
  description: REST API to embed IRS-authorized income-tax preparation and e-filing. Create a Column Tax user, obtain a short-lived
    authenticated URL to launch the embedded filing UI, list a user's tax returns and jurisdictions, and subscribe to webhook
    events across the filing lifecycle.
  humanURL: https://docs.columntax.com/v1.1/reference
  baseURL: https://prod.columnapi.com
  tags:
  - Tax
  - E-File
  - Embedded Finance
  properties:
  - type: Documentation
    url: https://docs.columntax.com/docs/welcome
  - type: APIReference
    url: https://docs.columntax.com/v1.1/reference
  - type: Authentication
    url: https://docs.columntax.com/reference/authentication
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/column-tax-domain-security.yml
- type: Website
  url: https://www.columntax.com/
- type: DeveloperPortal
  url: https://docs.columntax.com/docs/welcome
- type: Documentation
  url: https://docs.columntax.com/docs/welcome
- type: APIReference
  url: https://docs.columntax.com/v1.1/reference
- type: GettingStarted
  url: https://docs.columntax.com/docs/quick-start
- type: Quickstart
  url: https://docs.columntax.com/docs/quick-start
- type: Authentication
  url: https://docs.columntax.com/reference/authentication
- type: Support
  url: https://www.columntax.com/contact-us
- type: Blog
  url: https://www.columntax.com/blog
- type: GitHubOrganization
  url: https://github.com/column-tax
- type: StatusPage
  url: https://status.columntax.com
- type: TermsOfService
  url: https://www.columntax.com/terms-of-use
- type: PrivacyPolicy
  url: https://www.columntax.com/privacy-policy
- type: Packages
  url: packages/column-tax-packages.yml
- type: SDKs
  url: packages/column-tax-packages.yml
- type: LLMsTxt
  url: llms/column-tax-llms.txt
- type: Authentication
  url: authentication/column-tax-authentication.yml
- type: Conventions
  url: conventions/column-tax-conventions.yml
- type: ErrorCatalog
  url: errors/column-tax-problem-types.yml
- type: Lifecycle
  url: lifecycle/column-tax-lifecycle.yml
- type: Conformance
  url: conformance/column-tax-conformance.yml
- type: Compliance
  url: conformance/column-tax-conformance.yml
- type: MCPServer
  url: mcp/column-tax-mcp.yml
- type: Sandbox
  url: sandbox/column-tax-sandbox.yml
- type: Webhooks
  url: asyncapi/column-tax-webhooks.yml
- type: DataModel
  url: data-model/column-tax-data-model.yml
- type: Components
  url: components/column-tax-components.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Column Tax

Kin Score

APIs 1

Column Tax API

MCP Servers 1

Column Tax MCP Server

Event Specifications 1

Column Tax Webhooks

Security Posture 2

Column Tax Authentication

Column Tax Domain Security

Resources